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context","\u002Fcompare\u002Fconsola","8.compare\u002F5.consola",{"id":608,"title":275,"body":609,"description":3667,"extension":3668,"links":3669,"meta":3672,"navigation":3673,"path":276,"seo":3674,"stem":277,"__hash__":3675},"docs\u002F4.integrate\u002Fframeworks\u002F07.express.md",{"type":610,"value":611,"toc":3644},"minimark",[612,625,672,676,681,761,765,1087,1111,1117,1120,1123,1430,1433,1497,1501,1510,1695,1804,1820,1827,1859,2087,2091,2109,2447,2450,2497,2500,2510,2514,2517,2684,2688,2695,2887,2898,2902,2908,3012,3016,3026,3169,3173,3179,3183,3337,3341,3348,3528,3538,3542,3583,3591,3601,3605,3611,3640],[613,614,615,616,620,621,624],"p",{},"The ",[617,618,619],"code",{},"evlog\u002Fexpress"," middleware auto-creates a request-scoped logger on ",[617,622,623],{},"req.log"," and emits a wide event when the response finishes.",[626,627,630,633,658],"prompt",{":actions":628,"description":629,"icon":278},"[\"copy\",\"cursor\",\"claude\"]","Set up evlog in my Express app",[613,631,632],{},"Set up evlog in my Express app.",[634,635,636,640,643,646,649,652,655],"ul",{},[637,638,639],"li",{},"Install evlog: pnpm add evlog",[637,641,642],{},"Call initLogger({ env: { service: 'my-api' } }) at startup",[637,644,645],{},"Alternatively, use evlog\u002Fvite plugin in vite.config.ts for auto-init (replaces initLogger)",[637,647,648],{},"Import evlog middleware from 'evlog\u002Fexpress' and add app.use(evlog())",[637,650,651],{},"Access the logger via req.log in routes or useLogger() anywhere in the call stack",[637,653,654],{},"Use log.set() to accumulate context, throw createError() for structured errors",[637,656,657],{},"Optionally pass drain, enrich, include, and keep options to evlog()",[613,659,660,661,667,668],{},"Docs: ",[662,663,664],"a",{"href":664,"rel":665},"https:\u002F\u002Fwww.evlog.dev\u002Fintegrate\u002Fframeworks\u002Fexpress",[666],"nofollow","\nAdapters: ",[662,669,670],{"href":670,"rel":671},"https:\u002F\u002Fwww.evlog.dev\u002Fintegrate\u002Fadapters\u002Foverview",[666],[673,674,25],"h2",{"id":675},"quick-start",[677,678,680],"h3",{"id":679},"_1-install","1. Install",[682,683,684,712,728,744],"code-group",{},[685,686,692],"pre",{"className":687,"code":688,"filename":689,"language":690,"meta":691,"style":691},"language-bash shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","pnpm add evlog express\n","pnpm","bash","",[617,693,694],{"__ignoreMap":691},[695,696,699,702,706,709],"span",{"class":697,"line":698},"line",1,[695,700,689],{"class":701},"sBMFI",[695,703,705],{"class":704},"sfazB"," add",[695,707,708],{"class":704}," evlog",[695,710,711],{"class":704}," express\n",[685,713,716],{"className":687,"code":714,"filename":715,"language":690,"meta":691,"style":691},"bun add evlog express\n","bun",[617,717,718],{"__ignoreMap":691},[695,719,720,722,724,726],{"class":697,"line":698},[695,721,715],{"class":701},[695,723,705],{"class":704},[695,725,708],{"class":704},[695,727,711],{"class":704},[685,729,732],{"className":687,"code":730,"filename":731,"language":690,"meta":691,"style":691},"yarn add evlog express\n","yarn",[617,733,734],{"__ignoreMap":691},[695,735,736,738,740,742],{"class":697,"line":698},[695,737,731],{"class":701},[695,739,705],{"class":704},[695,741,708],{"class":704},[695,743,711],{"class":704},[685,745,748],{"className":687,"code":746,"filename":747,"language":690,"meta":691,"style":691},"npm install evlog express\n","npm",[617,749,750],{"__ignoreMap":691},[695,751,752,754,757,759],{"class":697,"line":698},[695,753,747],{"class":701},[695,755,756],{"class":704}," install",[695,758,708],{"class":704},[695,760,711],{"class":704},[677,762,764],{"id":763},"_2-initialize-and-register-the-middleware","2. Initialize and register the middleware",[685,766,771],{"className":767,"code":768,"filename":769,"language":770,"meta":691,"style":691},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","import express from 'express'\nimport { initLogger } from 'evlog'\nimport { evlog } from 'evlog\u002Fexpress'\n\ninitLogger({\n  env: { service: 'my-api' },\n})\n\nconst app = express()\n\napp.use(evlog())\n\napp.get('\u002Fhealth', (req, res) => {\n  req.log.set({ route: 'health' })\n  res.json({ ok: true })\n})\n\napp.listen(3000)\n","src\u002Findex.ts","typescript",[617,772,773,796,820,839,846,859,887,896,901,920,925,944,949,992,1029,1057,1064,1069],{"__ignoreMap":691},[695,774,775,779,783,786,790,793],{"class":697,"line":698},[695,776,778],{"class":777},"s7zQu","import",[695,780,782],{"class":781},"sTEyZ"," express ",[695,784,785],{"class":777},"from",[695,787,789],{"class":788},"sMK4o"," 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ok",[695,1048,868],{"class":788},[695,1050,1052],{"class":1051},"sfNiH"," true",[695,1054,809],{"class":788},[695,1056,895],{"class":864},[695,1058,1060,1062],{"class":697,"line":1059},16,[695,1061,892],{"class":788},[695,1063,895],{"class":781},[695,1065,1067],{"class":697,"line":1066},17,[695,1068,845],{"emptyLinePlaceholder":844},[695,1070,1072,1074,1076,1079,1081,1085],{"class":697,"line":1071},18,[695,1073,930],{"class":781},[695,1075,933],{"class":788},[695,1077,1078],{"class":851},"listen",[695,1080,855],{"class":781},[695,1082,1084],{"class":1083},"sbssI","3000",[695,1086,895],{"class":781},[1088,1089,1091,1095,1096,1102,1103,1106,1107,1110],"callout",{"color":1090,"icon":563},"info",[1092,1093,1094],"strong",{},"Using Vite?"," The ",[662,1097,1098,1101],{"href":561},[617,1099,1100],{},"evlog\u002Fvite"," plugin"," replaces the ",[617,1104,1105],{},"initLogger()"," call with compile-time auto-initialization, strips ",[617,1108,1109],{},"log.debug()"," from production builds, 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One request = one wide event:",[685,1124,1126],{"className":767,"code":1125,"filename":769,"language":770,"meta":691,"style":691},"app.get('\u002Fusers\u002F:id', async (req, res) => {\n  const userId = req.params.id\n\n  req.log.set({ user: { id: userId } })\n\n  const user = await db.findUser(userId)\n  req.log.set({ user: { name: user.name, plan: user.plan } })\n\n  const orders = await db.findOrders(userId)\n  req.log.set({ orders: { count: orders.length, totalRevenue: sum(orders) } })\n\n  res.json({ user, orders 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totalRevenue",[695,1380,868],{"class":788},[695,1382,1383],{"class":851}," sum",[695,1385,855],{"class":864},[695,1387,1388],{"class":781},"orders",[695,1390,1391],{"class":864},") ",[695,1393,892],{"class":788},[695,1395,809],{"class":788},[695,1397,895],{"class":864},[695,1399,1400],{"class":697,"line":927},[695,1401,845],{"emptyLinePlaceholder":844},[695,1403,1404,1406,1408,1410,1412,1414,1416,1418,1420,1422],{"class":697,"line":946},[695,1405,1034],{"class":781},[695,1407,933],{"class":788},[695,1409,1039],{"class":851},[695,1411,855],{"class":864},[695,1413,1012],{"class":788},[695,1415,1210],{"class":781},[695,1417,970],{"class":788},[695,1419,1322],{"class":781},[695,1421,809],{"class":788},[695,1423,895],{"class":864},[695,1425,1426,1428],{"class":697,"line":951},[695,1427,892],{"class":788},[695,1429,895],{"class":781},[613,1431,1432],{},"All fields are merged into a single wide event emitted when the response finishes:",[685,1434,1437],{"className":687,"code":1435,"filename":1436,"language":690,"meta":691,"style":691},"14:58:15 INFO [my-api] GET \u002Fusers\u002Fusr_123 200 in 12ms\n  ├─ orders: count=2 totalRevenue=6298\n  ├─ user: id=usr_123 name=Alice plan=pro\n  └─ requestId: 4a8ff3a8-...\n","Terminal output",[617,1438,1439,1450,1470,1486],{"__ignoreMap":691},[695,1440,1441,1444,1447],{"class":697,"line":698},[695,1442,1443],{"class":701},"14:58:15",[695,1445,1446],{"class":704}," INFO",[695,1448,1449],{"class":781}," [my-api] GET \u002Fusers\u002Fusr_123 200 in 12ms\n",[695,1451,1452,1455,1458,1461,1464,1467],{"class":697,"line":798},[695,1453,1454],{"class":701},"  ├─",[695,1456,1457],{"class":704}," orders:",[695,1459,1460],{"class":704}," count=",[695,1462,1463],{"class":1083},"2",[695,1465,1466],{"class":704}," totalRevenue=",[695,1468,1469],{"class":1083},"6298\n",[695,1471,1472,1474,1477,1480,1483],{"class":697,"line":822},[695,1473,1454],{"class":701},[695,1475,1476],{"class":704}," user:",[695,1478,1479],{"class":704}," id=usr_123",[695,1481,1482],{"class":704}," name=Alice",[695,1484,1485],{"class":704}," plan=pro\n",[695,1487,1488,1491,1494],{"class":697,"line":841},[695,1489,1490],{"class":701},"  └─",[695,1492,1493],{"class":704}," requestId:",[695,1495,1496],{"class":704}," 4a8ff3a8-...\n",[673,1498,1500],{"id":1499},"uselogger","useLogger()",[613,1502,1503,1504,1506,1507,1509],{},"Use ",[617,1505,1500],{}," to access the request-scoped logger from anywhere in the call stack without passing ",[617,1508,977],{}," through your service layer:",[685,1511,1514],{"className":767,"code":1512,"filename":1513,"language":770,"meta":691,"style":691},"import { useLogger } from 'evlog\u002Fexpress'\n\nexport async function findUser(id: string) {\n  const log = useLogger()\n  log.set({ user: { id } })\n\n  const user = await db.findUser(id)\n  log.set({ user: { name: user.name, plan: user.plan } })\n\n  return user\n}\n","src\u002Fservices\u002Fuser.ts",[617,1515,1516,1535,1539,1566,1579,1606,1610,1632,1678,1682,1690],{"__ignoreMap":691},[695,1517,1518,1520,1522,1525,1527,1529,1531,1533],{"class":697,"line":698},[695,1519,778],{"class":777},[695,1521,803],{"class":788},[695,1523,1524],{"class":781}," useLogger",[695,1526,809],{"class":788},[695,1528,812],{"class":777},[695,1530,789],{"class":788},[695,1532,619],{"class":704},[695,1534,795],{"class":788},[695,1536,1537],{"class":697,"line":798},[695,1538,845],{"emptyLinePlaceholder":844},[695,1540,1541,1544,1546,1549,1552,1554,1557,1559,1562,1564],{"class":697,"line":822},[695,1542,1543],{"class":777},"export",[695,1545,1149],{"class":906},[695,1547,1548],{"class":906}," function",[695,1550,1551],{"class":851}," findUser",[695,1553,855],{"class":788},[695,1555,1556],{"class":976},"id",[695,1558,868],{"class":788},[695,1560,1561],{"class":701}," string",[695,1563,985],{"class":788},[695,1565,991],{"class":788},[695,1567,1568,1570,1573,1575,1577],{"class":697,"line":841},[695,1569,1168],{"class":906},[695,1571,1572],{"class":781}," log",[695,1574,1174],{"class":788},[695,1576,1524],{"class":851},[695,1578,919],{"class":864},[695,1580,1581,1584,1586,1588,1590,1592,1594,1596,1598,1600,1602,1604],{"class":697,"line":848},[695,1582,1583],{"class":781},"  log",[695,1585,933],{"class":788},[695,1587,1007],{"class":851},[695,1589,855],{"class":864},[695,1591,1012],{"class":788},[695,1593,1210],{"class":864},[695,1595,868],{"class":788},[695,1597,803],{"class":788},[695,1599,1217],{"class":781},[695,1601,809],{"class":788},[695,1603,809],{"class":788},[695,1605,895],{"class":864},[695,1607,1608],{"class":697,"line":861},[695,1609,845],{"emptyLinePlaceholder":844},[695,1611,1612,1614,1616,1618,1620,1622,1624,1626,1628,1630],{"class":697,"line":889},[695,1613,1168],{"class":906},[695,1615,1210],{"class":781},[695,1617,1174],{"class":788},[695,1619,1242],{"class":777},[695,1621,1245],{"class":781},[695,1623,933],{"class":788},[695,1625,1250],{"class":851},[695,1627,855],{"class":864},[695,1629,1556],{"class":781},[695,1631,895],{"class":864},[695,1633,1634,1636,1638,1640,1642,1644,1646,1648,1650,1652,1654,1656,1658,1660,1662,1664,1666,1668,1670,1672,1674,1676],{"class":697,"line":898},[695,1635,1583],{"class":781},[695,1637,933],{"class":788},[695,1639,1007],{"class":851},[695,1641,855],{"class":864},[695,1643,1012],{"class":788},[695,1645,1210],{"class":864},[695,1647,868],{"class":788},[695,1649,803],{"class":788},[695,1651,1282],{"class":864},[695,1653,868],{"class":788},[695,1655,1210],{"class":781},[695,1657,933],{"class":788},[695,1659,1291],{"class":781},[695,1661,970],{"class":788},[695,1663,1296],{"class":864},[695,1665,868],{"class":788},[695,1667,1210],{"class":781},[695,1669,933],{"class":788},[695,1671,1305],{"class":781},[695,1673,809],{"class":788},[695,1675,809],{"class":788},[695,1677,895],{"class":864},[695,1679,1680],{"class":697,"line":903},[695,1681,845],{"emptyLinePlaceholder":844},[695,1683,1684,1687],{"class":697,"line":922},[695,1685,1686],{"class":777},"  return",[695,1688,1689],{"class":781}," user\n",[695,1691,1692],{"class":697,"line":927},[695,1693,1694],{"class":788},"}\n",[685,1696,1698],{"className":767,"code":1697,"filename":769,"language":770,"meta":691,"style":691},"import { findUser } from '.\u002Fservices\u002Fuser'\n\napp.get('\u002Fusers\u002F:id', async (req, res) => {\n  const user = await findUser(req.params.id)\n  res.json(user)\n})\n",[617,1699,1700,1719,1723,1757,1783,1798],{"__ignoreMap":691},[695,1701,1702,1704,1706,1708,1710,1712,1714,1717],{"class":697,"line":698},[695,1703,778],{"class":777},[695,1705,803],{"class":788},[695,1707,1551],{"class":781},[695,1709,809],{"class":788},[695,1711,812],{"class":777},[695,1713,789],{"class":788},[695,1715,1716],{"class":704},".\u002Fservices\u002Fuser",[695,1718,795],{"class":788},[695,1720,1721],{"class":697,"line":798},[695,1722,845],{"emptyLinePlaceholder":844},[695,1724,1725,1727,1729,1731,1733,1735,1737,1739,1741,1743,1745,1747,1749,1751,1753,1755],{"class":697,"line":822},[695,1726,930],{"class":781},[695,1728,933],{"class":788},[695,1730,958],{"class":851},[695,1732,855],{"class":781},[695,1734,883],{"class":788},[695,1736,1142],{"class":704},[695,1738,883],{"class":788},[695,1740,970],{"class":788},[695,1742,1149],{"class":906},[695,1744,973],{"class":788},[695,1746,977],{"class":976},[695,1748,970],{"class":788},[695,1750,982],{"class":976},[695,1752,985],{"class":788},[695,1754,988],{"class":906},[695,1756,991],{"class":788},[695,1758,1759,1761,1763,1765,1767,1769,1771,1773,1775,1777,1779,1781],{"class":697,"line":841},[695,1760,1168],{"class":906},[695,1762,1210],{"class":781},[695,1764,1174],{"class":788},[695,1766,1242],{"class":777},[695,1768,1551],{"class":851},[695,1770,855],{"class":864},[695,1772,977],{"class":781},[695,1774,933],{"class":788},[695,1776,1182],{"class":781},[695,1778,933],{"class":788},[695,1780,1556],{"class":781},[695,1782,895],{"class":864},[695,1784,1785,1787,1789,1791,1793,1796],{"class":697,"line":848},[695,1786,1034],{"class":781},[695,1788,933],{"class":788},[695,1790,1039],{"class":851},[695,1792,855],{"class":864},[695,1794,1795],{"class":781},"user",[695,1797,895],{"class":864},[695,1799,1800,1802],{"class":697,"line":861},[695,1801,892],{"class":788},[695,1803,895],{"class":781},[613,1805,1806,1807,1809,1810,1812,1813,1815,1816,1819],{},"Both ",[617,1808,623],{}," and ",[617,1811,1500],{}," return the same logger instance. ",[617,1814,1500],{}," uses ",[617,1817,1818],{},"AsyncLocalStorage"," to propagate the logger across async boundaries.",[673,1821,1823,1824,985],{"id":1822},"background-work-logfork","Background work (",[617,1825,1826],{},"log.fork",[613,1828,1829,1830,1833,1834,1839,1840,1842,1843,1846,1847,1809,1850,1853,1854,1858],{},"Fire-and-forget async work that finishes ",[1092,1831,1832],{},"after"," the response can no longer update the request wide event (the logger is sealed after emit). Use ",[1092,1835,1836],{},[617,1837,1838],{},"req.log.fork(label, fn)"," so ",[617,1841,1500],{}," inside ",[617,1844,1845],{},"fn"," targets the forked logger, which emits its own event with ",[617,1848,1849],{},"operation",[617,1851,1852],{},"_parentRequestId",". See ",[662,1855,1857],{"href":1856},"\u002Flearn\u002Fwide-events#after-emit-sealing-and-background-work","After emit"," in Wide events.",[685,1860,1862],{"className":767,"code":1861,"filename":769,"language":770,"meta":691,"style":691},"import { evlog, useLogger } from 'evlog\u002Fexpress'\n\napp.use(evlog())\n\napp.post('\u002Forders', (req, res) => {\n  req.log.set({ orderId: 'ord_1' })\n  req.log.fork!('fulfill_order', async () => {\n    const log = useLogger()\n    log.set({ step: 'inventory_ok' })\n  })\n  res.json({ ok: true })\n})\n",[617,1863,1864,1886,1890,1904,1908,1942,1974,2010,2023,2052,2059,2081],{"__ignoreMap":691},[695,1865,1866,1868,1870,1872,1874,1876,1878,1880,1882,1884],{"class":697,"line":698},[695,1867,778],{"class":777},[695,1869,803],{"class":788},[695,1871,708],{"class":781},[695,1873,970],{"class":788},[695,1875,1524],{"class":781},[695,1877,809],{"class":788},[695,1879,812],{"class":777},[695,1881,789],{"class":788},[695,1883,619],{"class":704},[695,1885,795],{"class":788},[695,1887,1888],{"class":697,"line":798},[695,1889,845],{"emptyLinePlaceholder":844},[695,1891,1892,1894,1896,1898,1900,1902],{"class":697,"line":822},[695,1893,930],{"class":781},[695,1895,933],{"class":788},[695,1897,936],{"class":851},[695,1899,855],{"class":781},[695,1901,817],{"class":851},[695,1903,943],{"class":781},[695,1905,1906],{"class":697,"line":841},[695,1907,845],{"emptyLinePlaceholder":844},[695,1909,1910,1912,1914,1917,1919,1921,1924,1926,1928,1930,1932,1934,1936,1938,1940],{"class":697,"line":848},[695,1911,930],{"class":781},[695,1913,933],{"class":788},[695,1915,1916],{"class":851},"post",[695,1918,855],{"class":781},[695,1920,883],{"class":788},[695,1922,1923],{"class":704},"\u002Forders",[695,1925,883],{"class":788},[695,1927,970],{"class":788},[695,1929,973],{"class":788},[695,1931,977],{"class":976},[695,1933,970],{"class":788},[695,1935,982],{"class":976},[695,1937,985],{"class":788},[695,1939,988],{"class":906},[695,1941,991],{"class":788},[695,1943,1944,1946,1948,1950,1952,1954,1956,1958,1961,1963,1965,1968,1970,1972],{"class":697,"line":861},[695,1945,997],{"class":781},[695,1947,933],{"class":788},[695,1949,1002],{"class":781},[695,1951,933],{"class":788},[695,1953,1007],{"class":851},[695,1955,855],{"class":864},[695,1957,1012],{"class":788},[695,1959,1960],{"class":864}," orderId",[695,1962,868],{"class":788},[695,1964,789],{"class":788},[695,1966,1967],{"class":704},"ord_1",[695,1969,883],{"class":788},[695,1971,809],{"class":788},[695,1973,895],{"class":864},[695,1975,1976,1978,1980,1982,1984,1987,1990,1992,1994,1997,1999,2001,2003,2006,2008],{"class":697,"line":889},[695,1977,997],{"class":781},[695,1979,933],{"class":788},[695,1981,1002],{"class":781},[695,1983,933],{"class":788},[695,1985,1986],{"class":851},"fork",[695,1988,1989],{"class":788},"!",[695,1991,855],{"class":864},[695,1993,883],{"class":788},[695,1995,1996],{"class":704},"fulfill_order",[695,1998,883],{"class":788},[695,2000,970],{"class":788},[695,2002,1149],{"class":906},[695,2004,2005],{"class":788}," ()",[695,2007,988],{"class":906},[695,2009,991],{"class":788},[695,2011,2012,2015,2017,2019,2021],{"class":697,"line":898},[695,2013,2014],{"class":906},"    const",[695,2016,1572],{"class":781},[695,2018,1174],{"class":788},[695,2020,1524],{"class":851},[695,2022,919],{"class":864},[695,2024,2025,2028,2030,2032,2034,2036,2039,2041,2043,2046,2048,2050],{"class":697,"line":903},[695,2026,2027],{"class":781},"    log",[695,2029,933],{"class":788},[695,2031,1007],{"class":851},[695,2033,855],{"class":864},[695,2035,1012],{"class":788},[695,2037,2038],{"class":864}," step",[695,2040,868],{"class":788},[695,2042,789],{"class":788},[695,2044,2045],{"class":704},"inventory_ok",[695,2047,883],{"class":788},[695,2049,809],{"class":788},[695,2051,895],{"class":864},[695,2053,2054,2057],{"class":697,"line":922},[695,2055,2056],{"class":788},"  }",[695,2058,895],{"class":864},[695,2060,2061,2063,2065,2067,2069,2071,2073,2075,2077,2079],{"class":697,"line":927},[695,2062,1034],{"class":781},[695,2064,933],{"class":788},[695,2066,1039],{"class":851},[695,2068,855],{"class":864},[695,2070,1012],{"class":788},[695,2072,1046],{"class":864},[695,2074,868],{"class":788},[695,2076,1052],{"class":1051},[695,2078,809],{"class":788},[695,2080,895],{"class":864},[695,2082,2083,2085],{"class":697,"line":946},[695,2084,892],{"class":788},[695,2086,895],{"class":781},[673,2088,2090],{"id":2089},"error-handling","Error Handling",[613,2092,1503,2093,2096,2097,2100,2101,2104,2105,2108],{},[617,2094,2095],{},"createError"," for structured errors with ",[617,2098,2099],{},"why",", ",[617,2102,2103],{},"fix",", and ",[617,2106,2107],{},"link"," fields. Express uses a 4-argument error handler middleware:",[685,2110,2112],{"className":767,"code":2111,"filename":769,"language":770,"meta":691,"style":691},"import { createError, parseError } from 'evlog'\n\napp.get('\u002Fcheckout', () => {\n  throw createError({\n    message: 'Payment failed',\n    status: 402,\n    why: 'Card declined by issuer',\n    fix: 'Try a different payment method',\n    link: 'https:\u002F\u002Fdocs.example.com\u002Fpayments\u002Fdeclined',\n  })\n})\n\napp.use((err, req, res, next) => {\n  req.log.error(err)\n  const parsed = parseError(err)\n\n  res.status(parsed.status).json({\n    message: parsed.message,\n    why: parsed.why,\n    fix: parsed.fix,\n    link: parsed.link,\n  })\n})\n",[617,2113,2114,2138,2142,2167,2178,2195,2207,2223,2239,2255,2261,2267,2271,2305,2324,2341,2345,2373,2388,2403,2418,2433,2440],{"__ignoreMap":691},[695,2115,2116,2118,2120,2123,2125,2128,2130,2132,2134,2136],{"class":697,"line":698},[695,2117,778],{"class":777},[695,2119,803],{"class":788},[695,2121,2122],{"class":781}," createError",[695,2124,970],{"class":788},[695,2126,2127],{"class":781}," parseError",[695,2129,809],{"class":788},[695,2131,812],{"class":777},[695,2133,789],{"class":788},[695,2135,817],{"class":704},[695,2137,795],{"class":788},[695,2139,2140],{"class":697,"line":798},[695,2141,845],{"emptyLinePlaceholder":844},[695,2143,2144,2146,2148,2150,2152,2154,2157,2159,2161,2163,2165],{"class":697,"line":822},[695,2145,930],{"class":781},[695,2147,933],{"class":788},[695,2149,958],{"class":851},[695,2151,855],{"class":781},[695,2153,883],{"class":788},[695,2155,2156],{"class":704},"\u002Fcheckout",[695,2158,883],{"class":788},[695,2160,970],{"class":788},[695,2162,2005],{"class":788},[695,2164,988],{"class":906},[695,2166,991],{"class":788},[695,2168,2169,2172,2174,2176],{"class":697,"line":841},[695,2170,2171],{"class":777},"  throw",[695,2173,2122],{"class":851},[695,2175,855],{"class":864},[695,2177,858],{"class":788},[695,2179,2180,2183,2185,2187,2190,2192],{"class":697,"line":848},[695,2181,2182],{"class":864},"    message",[695,2184,868],{"class":788},[695,2186,789],{"class":788},[695,2188,2189],{"class":704},"Payment failed",[695,2191,883],{"class":788},[695,2193,2194],{"class":788},",\n",[695,2196,2197,2200,2202,2205],{"class":697,"line":861},[695,2198,2199],{"class":864},"    status",[695,2201,868],{"class":788},[695,2203,2204],{"class":1083}," 402",[695,2206,2194],{"class":788},[695,2208,2209,2212,2214,2216,2219,2221],{"class":697,"line":889},[695,2210,2211],{"class":864},"    why",[695,2213,868],{"class":788},[695,2215,789],{"class":788},[695,2217,2218],{"class":704},"Card declined by issuer",[695,2220,883],{"class":788},[695,2222,2194],{"class":788},[695,2224,2225,2228,2230,2232,2235,2237],{"class":697,"line":898},[695,2226,2227],{"class":864},"    fix",[695,2229,868],{"class":788},[695,2231,789],{"class":788},[695,2233,2234],{"class":704},"Try a different payment method",[695,2236,883],{"class":788},[695,2238,2194],{"class":788},[695,2240,2241,2244,2246,2248,2251,2253],{"class":697,"line":903},[695,2242,2243],{"class":864},"    link",[695,2245,868],{"class":788},[695,2247,789],{"class":788},[695,2249,2250],{"class":704},"https:\u002F\u002Fdocs.example.com\u002Fpayments\u002Fdeclined",[695,2252,883],{"class":788},[695,2254,2194],{"class":788},[695,2256,2257,2259],{"class":697,"line":922},[695,2258,2056],{"class":788},[695,2260,895],{"class":864},[695,2262,2263,2265],{"class":697,"line":927},[695,2264,892],{"class":788},[695,2266,895],{"class":781},[695,2268,2269],{"class":697,"line":946},[695,2270,845],{"emptyLinePlaceholder":844},[695,2272,2273,2275,2277,2279,2281,2283,2286,2288,2290,2292,2294,2296,2299,2301,2303],{"class":697,"line":951},[695,2274,930],{"class":781},[695,2276,933],{"class":788},[695,2278,936],{"class":851},[695,2280,855],{"class":781},[695,2282,855],{"class":788},[695,2284,2285],{"class":976},"err",[695,2287,970],{"class":788},[695,2289,1177],{"class":976},[695,2291,970],{"class":788},[695,2293,982],{"class":976},[695,2295,970],{"class":788},[695,2297,2298],{"class":976}," next",[695,2300,985],{"class":788},[695,2302,988],{"class":906},[695,2304,991],{"class":788},[695,2306,2307,2309,2311,2313,2315,2318,2320,2322],{"class":697,"line":994},[695,2308,997],{"class":781},[695,2310,933],{"class":788},[695,2312,1002],{"class":781},[695,2314,933],{"class":788},[695,2316,2317],{"class":851},"error",[695,2319,855],{"class":864},[695,2321,2285],{"class":781},[695,2323,895],{"class":864},[695,2325,2326,2328,2331,2333,2335,2337,2339],{"class":697,"line":1031},[695,2327,1168],{"class":906},[695,2329,2330],{"class":781}," parsed",[695,2332,1174],{"class":788},[695,2334,2127],{"class":851},[695,2336,855],{"class":864},[695,2338,2285],{"class":781},[695,2340,895],{"class":864},[695,2342,2343],{"class":697,"line":1059},[695,2344,845],{"emptyLinePlaceholder":844},[695,2346,2347,2349,2351,2354,2356,2359,2361,2363,2365,2367,2369,2371],{"class":697,"line":1066},[695,2348,1034],{"class":781},[695,2350,933],{"class":788},[695,2352,2353],{"class":851},"status",[695,2355,855],{"class":864},[695,2357,2358],{"class":781},"parsed",[695,2360,933],{"class":788},[695,2362,2353],{"class":781},[695,2364,985],{"class":864},[695,2366,933],{"class":788},[695,2368,1039],{"class":851},[695,2370,855],{"class":864},[695,2372,858],{"class":788},[695,2374,2375,2377,2379,2381,2383,2386],{"class":697,"line":1071},[695,2376,2182],{"class":864},[695,2378,868],{"class":788},[695,2380,2330],{"class":781},[695,2382,933],{"class":788},[695,2384,2385],{"class":781},"message",[695,2387,2194],{"class":788},[695,2389,2391,2393,2395,2397,2399,2401],{"class":697,"line":2390},19,[695,2392,2211],{"class":864},[695,2394,868],{"class":788},[695,2396,2330],{"class":781},[695,2398,933],{"class":788},[695,2400,2099],{"class":781},[695,2402,2194],{"class":788},[695,2404,2406,2408,2410,2412,2414,2416],{"class":697,"line":2405},20,[695,2407,2227],{"class":864},[695,2409,868],{"class":788},[695,2411,2330],{"class":781},[695,2413,933],{"class":788},[695,2415,2103],{"class":781},[695,2417,2194],{"class":788},[695,2419,2421,2423,2425,2427,2429,2431],{"class":697,"line":2420},21,[695,2422,2243],{"class":864},[695,2424,868],{"class":788},[695,2426,2330],{"class":781},[695,2428,933],{"class":788},[695,2430,2107],{"class":781},[695,2432,2194],{"class":788},[695,2434,2436,2438],{"class":697,"line":2435},22,[695,2437,2056],{"class":788},[695,2439,895],{"class":864},[695,2441,2443,2445],{"class":697,"line":2442},23,[695,2444,892],{"class":788},[695,2446,895],{"class":781},[613,2448,2449],{},"The error is captured and logged with both the custom context and structured error fields:",[685,2451,2453],{"className":687,"code":2452,"filename":1436,"language":690,"meta":691,"style":691},"14:58:20 ERROR [my-api] GET \u002Fcheckout 402 in 3ms\n  ├─ error: name=EvlogError message=Payment failed status=402\n  └─ requestId: 880a50ac-...\n",[617,2454,2455,2466,2488],{"__ignoreMap":691},[695,2456,2457,2460,2463],{"class":697,"line":698},[695,2458,2459],{"class":701},"14:58:20",[695,2461,2462],{"class":704}," ERROR",[695,2464,2465],{"class":781}," [my-api] GET \u002Fcheckout 402 in 3ms\n",[695,2467,2468,2470,2473,2476,2479,2482,2485],{"class":697,"line":798},[695,2469,1454],{"class":701},[695,2471,2472],{"class":704}," error:",[695,2474,2475],{"class":704}," name=EvlogError",[695,2477,2478],{"class":704}," message=Payment",[695,2480,2481],{"class":704}," failed",[695,2483,2484],{"class":704}," status=",[695,2486,2487],{"class":1083},"402\n",[695,2489,2490,2492,2494],{"class":697,"line":822},[695,2491,1490],{"class":701},[695,2493,1493],{"class":704},[695,2495,2496],{"class":704}," 880a50ac-...\n",[673,2498,552],{"id":2499},"configuration",[613,2501,2502,2503,2506,2507,2509],{},"See the ",[662,2504,2505],{"href":553},"Configuration reference"," for all available options (",[617,2508,852],{},", middleware options, sampling, silent mode, etc.).",[673,2511,2513],{"id":2512},"drain-enrichers","Drain & Enrichers",[613,2515,2516],{},"Configure drain adapters and enrichers directly in the middleware options:",[685,2518,2520],{"className":767,"code":2519,"filename":769,"language":770,"meta":691,"style":691},"import { createAxiomDrain } from 'evlog\u002Faxiom'\nimport { createUserAgentEnricher } from 'evlog\u002Fenrichers'\n\nconst userAgent = createUserAgentEnricher()\n\napp.use(evlog({\n  drain: createAxiomDrain(),\n  enrich: (ctx) => {\n    userAgent(ctx)\n    ctx.event.region = process.env.FLY_REGION\n  },\n}))\n",[617,2521,2522,2542,2562,2566,2579,2583,2599,2613,2631,2642,2672,2677],{"__ignoreMap":691},[695,2523,2524,2526,2528,2531,2533,2535,2537,2540],{"class":697,"line":698},[695,2525,778],{"class":777},[695,2527,803],{"class":788},[695,2529,2530],{"class":781}," createAxiomDrain",[695,2532,809],{"class":788},[695,2534,812],{"class":777},[695,2536,789],{"class":788},[695,2538,2539],{"class":704},"evlog\u002Faxiom",[695,2541,795],{"class":788},[695,2543,2544,2546,2548,2551,2553,2555,2557,2560],{"class":697,"line":798},[695,2545,778],{"class":777},[695,2547,803],{"class":788},[695,2549,2550],{"class":781}," createUserAgentEnricher",[695,2552,809],{"class":788},[695,2554,812],{"class":777},[695,2556,789],{"class":788},[695,2558,2559],{"class":704},"evlog\u002Fenrichers",[695,2561,795],{"class":788},[695,2563,2564],{"class":697,"line":822},[695,2565,845],{"emptyLinePlaceholder":844},[695,2567,2568,2570,2573,2575,2577],{"class":697,"line":841},[695,2569,907],{"class":906},[695,2571,2572],{"class":781}," userAgent ",[695,2574,913],{"class":788},[695,2576,2550],{"class":851},[695,2578,919],{"class":781},[695,2580,2581],{"class":697,"line":848},[695,2582,845],{"emptyLinePlaceholder":844},[695,2584,2585,2587,2589,2591,2593,2595,2597],{"class":697,"line":861},[695,2586,930],{"class":781},[695,2588,933],{"class":788},[695,2590,936],{"class":851},[695,2592,855],{"class":781},[695,2594,817],{"class":851},[695,2596,855],{"class":781},[695,2598,858],{"class":788},[695,2600,2601,2604,2606,2608,2611],{"class":697,"line":889},[695,2602,2603],{"class":864},"  drain",[695,2605,868],{"class":788},[695,2607,2530],{"class":851},[695,2609,2610],{"class":781},"()",[695,2612,2194],{"class":788},[695,2614,2615,2618,2620,2622,2625,2627,2629],{"class":697,"line":898},[695,2616,2617],{"class":851},"  enrich",[695,2619,868],{"class":788},[695,2621,973],{"class":788},[695,2623,2624],{"class":976},"ctx",[695,2626,985],{"class":788},[695,2628,988],{"class":906},[695,2630,991],{"class":788},[695,2632,2633,2636,2638,2640],{"class":697,"line":903},[695,2634,2635],{"class":851},"    userAgent",[695,2637,855],{"class":864},[695,2639,2624],{"class":781},[695,2641,895],{"class":864},[695,2643,2644,2647,2649,2652,2654,2657,2659,2662,2664,2667,2669],{"class":697,"line":922},[695,2645,2646],{"class":781},"    ctx",[695,2648,933],{"class":788},[695,2650,2651],{"class":781},"event",[695,2653,933],{"class":788},[695,2655,2656],{"class":781},"region",[695,2658,1174],{"class":788},[695,2660,2661],{"class":781}," process",[695,2663,933],{"class":788},[695,2665,2666],{"class":781},"env",[695,2668,933],{"class":788},[695,2670,2671],{"class":781},"FLY_REGION\n",[695,2673,2674],{"class":697,"line":927},[695,2675,2676],{"class":788},"  },\n",[695,2678,2679,2681],{"class":697,"line":946},[695,2680,892],{"class":788},[695,2682,2683],{"class":781},"))\n",[677,2685,2687],{"id":2686},"pipeline-batching-retry","Pipeline (Batching & Retry)",[613,2689,2690,2691,2694],{},"For production, wrap your adapter with ",[617,2692,2693],{},"createDrainPipeline"," to batch events and retry on failure:",[685,2696,2698],{"className":767,"code":2697,"filename":769,"language":770,"meta":691,"style":691},"import type { DrainContext } from 'evlog'\nimport { createAxiomDrain } from 'evlog\u002Faxiom'\nimport { createDrainPipeline } from 'evlog\u002Fpipeline'\n\nconst pipeline = createDrainPipeline\u003CDrainContext>({\n  batch: { size: 50, intervalMs: 5000 },\n  retry: { maxAttempts: 3 },\n})\nconst drain = pipeline(createAxiomDrain())\n\napp.use(evlog({ drain }))\n",[617,2699,2700,2722,2740,2760,2764,2788,2817,2836,2842,2861,2865],{"__ignoreMap":691},[695,2701,2702,2704,2707,2709,2712,2714,2716,2718,2720],{"class":697,"line":698},[695,2703,778],{"class":777},[695,2705,2706],{"class":777}," type",[695,2708,803],{"class":788},[695,2710,2711],{"class":781}," DrainContext",[695,2713,809],{"class":788},[695,2715,812],{"class":777},[695,2717,789],{"class":788},[695,2719,817],{"class":704},[695,2721,795],{"class":788},[695,2723,2724,2726,2728,2730,2732,2734,2736,2738],{"class":697,"line":798},[695,2725,778],{"class":777},[695,2727,803],{"class":788},[695,2729,2530],{"class":781},[695,2731,809],{"class":788},[695,2733,812],{"class":777},[695,2735,789],{"class":788},[695,2737,2539],{"class":704},[695,2739,795],{"class":788},[695,2741,2742,2744,2746,2749,2751,2753,2755,2758],{"class":697,"line":822},[695,2743,778],{"class":777},[695,2745,803],{"class":788},[695,2747,2748],{"class":781}," createDrainPipeline",[695,2750,809],{"class":788},[695,2752,812],{"class":777},[695,2754,789],{"class":788},[695,2756,2757],{"class":704},"evlog\u002Fpipeline",[695,2759,795],{"class":788},[695,2761,2762],{"class":697,"line":841},[695,2763,845],{"emptyLinePlaceholder":844},[695,2765,2766,2768,2771,2773,2775,2778,2781,2784,2786],{"class":697,"line":848},[695,2767,907],{"class":906},[695,2769,2770],{"class":781}," pipeline ",[695,2772,913],{"class":788},[695,2774,2748],{"class":851},[695,2776,2777],{"class":788},"\u003C",[695,2779,2780],{"class":701},"DrainContext",[695,2782,2783],{"class":788},">",[695,2785,855],{"class":781},[695,2787,858],{"class":788},[695,2789,2790,2793,2795,2797,2800,2802,2805,2807,2810,2812,2815],{"class":697,"line":861},[695,2791,2792],{"class":864},"  batch",[695,2794,868],{"class":788},[695,2796,803],{"class":788},[695,2798,2799],{"class":864}," size",[695,2801,868],{"class":788},[695,2803,2804],{"class":1083}," 50",[695,2806,970],{"class":788},[695,2808,2809],{"class":864}," intervalMs",[695,2811,868],{"class":788},[695,2813,2814],{"class":1083}," 5000",[695,2816,886],{"class":788},[695,2818,2819,2822,2824,2826,2829,2831,2834],{"class":697,"line":889},[695,2820,2821],{"class":864},"  retry",[695,2823,868],{"class":788},[695,2825,803],{"class":788},[695,2827,2828],{"class":864}," maxAttempts",[695,2830,868],{"class":788},[695,2832,2833],{"class":1083}," 3",[695,2835,886],{"class":788},[695,2837,2838,2840],{"class":697,"line":898},[695,2839,892],{"class":788},[695,2841,895],{"class":781},[695,2843,2844,2846,2849,2851,2854,2856,2859],{"class":697,"line":903},[695,2845,907],{"class":906},[695,2847,2848],{"class":781}," drain ",[695,2850,913],{"class":788},[695,2852,2853],{"class":851}," pipeline",[695,2855,855],{"class":781},[695,2857,2858],{"class":851},"createAxiomDrain",[695,2860,943],{"class":781},[695,2862,2863],{"class":697,"line":922},[695,2864,845],{"emptyLinePlaceholder":844},[695,2866,2867,2869,2871,2873,2875,2877,2879,2881,2883,2885],{"class":697,"line":927},[695,2868,930],{"class":781},[695,2870,933],{"class":788},[695,2872,936],{"class":851},[695,2874,855],{"class":781},[695,2876,817],{"class":851},[695,2878,855],{"class":781},[695,2880,1012],{"class":788},[695,2882,2848],{"class":781},[695,2884,892],{"class":788},[695,2886,2683],{"class":781},[1088,2888,2889,2890,2893,2894,2897],{"color":1090,"icon":13},"Call ",[617,2891,2892],{},"drain.flush()"," on server shutdown to ensure all buffered events are sent. See the ",[662,2895,2896],{"href":540},"Pipeline docs"," for all options.",[673,2899,2901],{"id":2900},"tail-sampling","Tail Sampling",[613,2903,1503,2904,2907],{},[617,2905,2906],{},"keep"," to force-retain specific events regardless of head sampling:",[685,2909,2911],{"className":767,"code":2910,"filename":769,"language":770,"meta":691,"style":691},"app.use(evlog({\n  drain: createAxiomDrain(),\n  keep: (ctx) => {\n    if (ctx.duration && ctx.duration > 2000) ctx.shouldKeep = true\n  },\n}))\n",[617,2912,2913,2929,2941,2958,3002,3006],{"__ignoreMap":691},[695,2914,2915,2917,2919,2921,2923,2925,2927],{"class":697,"line":698},[695,2916,930],{"class":781},[695,2918,933],{"class":788},[695,2920,936],{"class":851},[695,2922,855],{"class":781},[695,2924,817],{"class":851},[695,2926,855],{"class":781},[695,2928,858],{"class":788},[695,2930,2931,2933,2935,2937,2939],{"class":697,"line":798},[695,2932,2603],{"class":864},[695,2934,868],{"class":788},[695,2936,2530],{"class":851},[695,2938,2610],{"class":781},[695,2940,2194],{"class":788},[695,2942,2943,2946,2948,2950,2952,2954,2956],{"class":697,"line":822},[695,2944,2945],{"class":851},"  keep",[695,2947,868],{"class":788},[695,2949,973],{"class":788},[695,2951,2624],{"class":976},[695,2953,985],{"class":788},[695,2955,988],{"class":906},[695,2957,991],{"class":788},[695,2959,2960,2963,2965,2967,2969,2972,2975,2978,2980,2982,2985,2988,2990,2992,2994,2997,2999],{"class":697,"line":841},[695,2961,2962],{"class":777},"    if",[695,2964,973],{"class":864},[695,2966,2624],{"class":781},[695,2968,933],{"class":788},[695,2970,2971],{"class":781},"duration",[695,2973,2974],{"class":788}," &&",[695,2976,2977],{"class":781}," ctx",[695,2979,933],{"class":788},[695,2981,2971],{"class":781},[695,2983,2984],{"class":788}," >",[695,2986,2987],{"class":1083}," 2000",[695,2989,1391],{"class":864},[695,2991,2624],{"class":781},[695,2993,933],{"class":788},[695,2995,2996],{"class":781},"shouldKeep",[695,2998,1174],{"class":788},[695,3000,3001],{"class":1051}," true\n",[695,3003,3004],{"class":697,"line":848},[695,3005,2676],{"class":788},[695,3007,3008,3010],{"class":697,"line":861},[695,3009,892],{"class":788},[695,3011,2683],{"class":781},[673,3013,3015],{"id":3014},"route-filtering","Route Filtering",[613,3017,3018,3019,1809,3022,3025],{},"Control which routes are logged with ",[617,3020,3021],{},"include",[617,3023,3024],{},"exclude"," patterns:",[685,3027,3029],{"className":767,"code":3028,"filename":769,"language":770,"meta":691,"style":691},"app.use(evlog({\n  include: ['\u002Fapi\u002F**'],\n  exclude: ['\u002F_internal\u002F**', '\u002Fhealth'],\n  routes: {\n    '\u002Fapi\u002Fauth\u002F**': { service: 'auth-service' },\n    '\u002Fapi\u002Fpayment\u002F**': { service: 'payment-service' },\n  },\n}))\n",[617,3030,3031,3047,3069,3097,3106,3133,3159,3163],{"__ignoreMap":691},[695,3032,3033,3035,3037,3039,3041,3043,3045],{"class":697,"line":698},[695,3034,930],{"class":781},[695,3036,933],{"class":788},[695,3038,936],{"class":851},[695,3040,855],{"class":781},[695,3042,817],{"class":851},[695,3044,855],{"class":781},[695,3046,858],{"class":788},[695,3048,3049,3052,3054,3057,3059,3062,3064,3067],{"class":697,"line":798},[695,3050,3051],{"class":864},"  include",[695,3053,868],{"class":788},[695,3055,3056],{"class":781}," [",[695,3058,883],{"class":788},[695,3060,3061],{"class":704},"\u002Fapi\u002F**",[695,3063,883],{"class":788},[695,3065,3066],{"class":781},"]",[695,3068,2194],{"class":788},[695,3070,3071,3074,3076,3078,3080,3083,3085,3087,3089,3091,3093,3095],{"class":697,"line":822},[695,3072,3073],{"class":864},"  exclude",[695,3075,868],{"class":788},[695,3077,3056],{"class":781},[695,3079,883],{"class":788},[695,3081,3082],{"class":704},"\u002F_internal\u002F**",[695,3084,883],{"class":788},[695,3086,970],{"class":788},[695,3088,789],{"class":788},[695,3090,965],{"class":704},[695,3092,883],{"class":788},[695,3094,3066],{"class":781},[695,3096,2194],{"class":788},[695,3098,3099,3102,3104],{"class":697,"line":841},[695,3100,3101],{"class":864},"  routes",[695,3103,868],{"class":788},[695,3105,991],{"class":788},[695,3107,3108,3111,3114,3116,3118,3120,3122,3124,3126,3129,3131],{"class":697,"line":848},[695,3109,3110],{"class":788},"    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",[662,3587,3588],{"href":3588,"rel":3589},"http:\u002F\u002Flocalhost:3000",[666]," to explore the interactive test UI.",[3592,3593,3594],"card-group",{},[3595,3596,3600],"card",{"icon":3597,"title":3598,"to":3599},"i-simple-icons-github","Source Code","https:\u002F\u002Fgithub.com\u002Fevloghq\u002Fevlog\u002Ftree\u002Fmain\u002Fexamples\u002Fexpress","Browse the complete Express example source on GitHub.",[673,3602,3604],{"id":3603},"next-steps","Next Steps",[613,3606,3607,3608,3610],{},"Deepen your ",[1092,3609,275],{}," integration:",[634,3612,3613,3618,3623,3628],{},[637,3614,3615,3617],{},[662,3616,51],{"href":52},": Design comprehensive events with context layering",[637,3619,3620,3622],{},[662,3621,153],{"href":158},": Send logs to Axiom, Sentry, PostHog, and more",[637,3624,3625,3627],{},[662,3626,66],{"href":67},": Control log volume with head and tail sampling",[637,3629,3630,3632,3633,2100,3635,2104,3637,3639],{},[662,3631,56],{"href":57},": Throw errors with 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