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Node.js 24 can run this TypeScript file directly:",[608,609,615],"pre",{"className":610,"code":611,"filename":612,"language":613,"meta":614,"style":614},"language-bash shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","npm install evlog\nnode server.ts\n","Terminal","bash","",[616,617,618,634],"code",{"__ignoreMap":614},[619,620,623,627,631],"span",{"class":621,"line":622},"line",1,[619,624,626],{"class":625},"sBMFI","npm",[619,628,630],{"class":629},"sfazB"," install",[619,632,633],{"class":629}," evlog\n",[619,635,637,640],{"class":621,"line":636},2,[619,638,639],{"class":625},"node",[619,641,642],{"class":629}," server.ts\n",[588,644,645,646,649,650,653],{},"The ",[616,647,648],{},"\u002Fcheckout"," route simulates a successful payment. Add ",[616,651,652],{},"?decline=1"," to exercise the error path. The payment IDs are fixture data, so no payment provider or credentials are needed.",[608,655,660],{"className":656,"code":657,"filename":658,"language":659,"meta":614,"style":614},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","import { randomUUID } from 'node:crypto'\nimport { createServer } from 'node:http'\nimport { createError, createLogger, initLogger } from 'evlog'\n\ninitLogger({ env: { service: 'checkout' }, pretty: false })\n\ncreateServer((req, res) => {\n  const url = new URL(req.url ?? '\u002F', 'http:\u002F\u002Flocalhost')\n  const requestId = randomUUID()\n  const log = createLogger({ requestId, method: req.method, path: url.pathname })\n  res.setHeader('x-request-id', requestId)\n  res.setHeader('content-type', 'application\u002Fjson')\n\n  try {\n    if (req.method !== 'POST' || url.pathname !== '\u002Fcheckout') {\n      res.statusCode = 404\n      log.set({ outcome: 'not-found' })\n      res.end(JSON.stringify({ error: 'Not found', requestId }))\n      return\n    }\n\n    log.set({ orderId: 'order-123', payment: { amount: 2999, currency: 'EUR' } })\n    if (url.searchParams.get('decline') === '1') {\n      throw createError({\n        message: 'Payment declined',\n        status: 402,\n        why: 'The simulated card has insufficient funds',\n        fix: 'Try another payment method',\n      })\n    }\n\n    log.set({ payment: { chargeId: 'ch_123' }, outcome: 'paid' })\n    res.statusCode = 200\n    res.end(JSON.stringify({ orderId: 'order-123', requestId }))\n  } catch (error) {\n    log.error(error instanceof Error ? error : new Error(String(error)))\n    log.set({ outcome: 'declined' })\n    res.statusCode = 402\n    res.end(JSON.stringify({ error: 'Payment declined', requestId }))\n  } finally {\n    log.emit({ status: res.statusCode })\n  }\n}).listen(3000)\n","server.ts","typescript",[616,661,662,691,711,743,750,802,807,836,885,900,951,977,1006,1011,1019,1067,1084,1115,1160,1166,1172,1177,1240,1284,1296,1314,1327,1344,1361,1369,1374,1379,1427,1442,1481,1499,1542,1570,1584,1623,1633,1662,1668],{"__ignoreMap":614},[619,663,664,668,672,676,679,682,685,688],{"class":621,"line":622},[619,665,667],{"class":666},"s7zQu","import",[619,669,671],{"class":670},"sMK4o"," {",[619,673,675],{"class":674},"sTEyZ"," randomUUID",[619,677,678],{"class":670}," }",[619,680,681],{"class":666}," from",[619,683,684],{"class":670}," 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402\n",[619,1585,1587,1589,1591,1593,1595,1597,1599,1601,1603,1605,1607,1609,1611,1613,1615,1617,1619,1621],{"class":621,"line":1586},39,[619,1588,1432],{"class":674},[619,1590,860],{"class":670},[619,1592,1124],{"class":755},[619,1594,759],{"class":765},[619,1596,1129],{"class":674},[619,1598,860],{"class":670},[619,1600,1134],{"class":755},[619,1602,759],{"class":765},[619,1604,762],{"class":670},[619,1606,1141],{"class":765},[619,1608,769],{"class":670},[619,1610,684],{"class":670},[619,1612,1308],{"class":629},[619,1614,784],{"class":670},[619,1616,723],{"class":670},[619,1618,892],{"class":674},[619,1620,678],{"class":670},[619,1622,1159],{"class":765},[619,1624,1626,1628,1631],{"class":621,"line":1625},40,[619,1627,1486],{"class":670},[619,1629,1630],{"class":666}," finally",[619,1632,835],{"class":670},[619,1634,1636,1638,1640,1643,1645,1647,1650,1652,1654,1656,1658,1660],{"class":621,"line":1635},41,[619,1637,1182],{"class":674},[619,1639,860],{"class":670},[619,1641,1642],{"class":755},"emit",[619,1644,759],{"class":765},[619,1646,762],{"class":670},[619,1648,1649],{"class":765}," status",[619,1651,769],{"class":670},[619,1653,825],{"class":674},[619,1655,860],{"class":670},[619,1657,1077],{"class":674},[619,1659,678],{"class":670},[619,1661,801],{"class":765},[619,1663,1665],{"class":621,"line":1664},42,[619,1666,1667],{"class":670},"  }\n",[619,1669,1671,1674,1676,1678,1681,1683,1686],{"class":621,"line":1670},43,[619,1672,1673],{"class":670},"}",[619,1675,828],{"class":674},[619,1677,860],{"class":670},[619,1679,1680],{"class":755},"listen",[619,1682,759],{"class":674},[619,1684,1685],{"class":1082},"3000",[619,1687,801],{"class":674},[588,1689,1690],{},"Send both requests from another terminal:",[608,1692,1694],{"className":610,"code":1693,"filename":612,"language":613,"meta":614,"style":614},"curl -i -X POST http:\u002F\u002Flocalhost:3000\u002Fcheckout\ncurl -i -X POST 'http:\u002F\u002Flocalhost:3000\u002Fcheckout?decline=1'\n",[616,1695,1696,1713],{"__ignoreMap":614},[619,1697,1698,1701,1704,1707,1710],{"class":621,"line":622},[619,1699,1700],{"class":625},"curl",[619,1702,1703],{"class":629}," -i",[619,1705,1706],{"class":629}," -X",[619,1708,1709],{"class":629}," POST",[619,1711,1712],{"class":629}," http:\u002F\u002Flocalhost:3000\u002Fcheckout\n",[619,1714,1715,1717,1719,1721,1723,1725,1728],{"class":621,"line":636},[619,1716,1700],{"class":625},[619,1718,1703],{"class":629},[619,1720,1706],{"class":629},[619,1722,1709],{"class":629},[619,1724,684],{"class":670},[619,1726,1727],{"class":629},"http:\u002F\u002Flocalhost:3000\u002Fcheckout?decline=1",[619,1729,690],{"class":670},[600,1731,1733],{"id":1732},"read-the-result","Read the result",[588,1735,1736,1737,1739,1740,1743],{},"The response's ",[616,1738,968],{}," header matches the event's ",[616,1741,1742],{},"requestId",". 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Both paths include ",[616,1964,1965],{},"durationMs",", measured from logger creation to emission. This example measures handler work, not confirmation that the client received the response.",[600,1968,1970],{"id":1969},"move-from-the-example-to-your-application","Move from the example to your application",[588,1972,1973,1974,1977],{},"Choose the fields that will help you debug this operation, such as order IDs, payment outcomes, and timings. Keep credentials and unnecessary personal data out of the context, and use ",[595,1975,1976],{"href":72},"Redaction"," for sensitive fields you retain.",[588,1979,645,1980,1983],{},[616,1981,1982],{},"finally"," block emits on normal returns and exceptions through this handler. It cannot guarantee delivery if the process is terminated.",[588,1985,1986,1989],{},[616,1987,1988],{},"pretty: false"," forces JSON in this example. Without that override, evlog selects pretty output in development and JSON in production.",[588,1991,1992,1993,1996,1997,2000,2001,860],{},"For Express, Fastify, NestJS, or Hono, use a ",[595,1994,1995],{"href":236},"framework integration"," to manage request logging. For remote delivery, choose a ",[595,1998,1999],{"href":153},"drain adapter"," and its batching\u002Fretry configuration. Short-lived processes must await pending delivery as described in ",[595,2002,2003],{"href":301},"Standalone TypeScript",[588,2005,2006,2007,2009,2010,2013],{},"To keep field names and values consistent across handlers, continue with ",[595,2008,76],{"href":77},". The ",[595,2011,2012],{"href":62},"Logging Lifecycle"," explains how framework integrations collect context and emit events for you.",[2015,2016,2017],"style",{},"html pre.shiki code .sBMFI, html code.shiki .sBMFI{--shiki-light:#E2931D;--shiki-default:#FFCB6B;--shiki-dark:#FFCB6B}html pre.shiki code .sfazB, html code.shiki .sfazB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html.light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html pre.shiki code .s7zQu, html code.shiki .s7zQu{--shiki-light:#39ADB5;--shiki-light-font-style:italic;--shiki-default:#89DDFF;--shiki-default-font-style:italic;--shiki-dark:#89DDFF;--shiki-dark-font-style:italic}html pre.shiki code .sMK4o, html code.shiki .sMK4o{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .sTEyZ, html code.shiki .sTEyZ{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .s2Zo4, html code.shiki .s2Zo4{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .swJcz, html code.shiki .swJcz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html pre.shiki code .sfNiH, html code.shiki .sfNiH{--shiki-light:#FF5370;--shiki-default:#FF9CAC;--shiki-dark:#FF9CAC}html pre.shiki code .sHdIc, html code.shiki .sHdIc{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#EEFFFF;--shiki-default-font-style:italic;--shiki-dark:#BABED8;--shiki-dark-font-style:italic}html pre.shiki code .spNyl, html code.shiki .spNyl{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .sbssI, html code.shiki .sbssI{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}",{"title":614,"searchDepth":636,"depth":636,"links":2019},[2020,2021,2022],{"id":602,"depth":636,"text":603},{"id":1732,"depth":636,"text":1733},{"id":1969,"depth":636,"text":1970},"Build a Node.js HTTP handler with structured request logs, explicit outcomes, error context, and a JSON event you can query.","md",[2026,2029],{"label":2003,"icon":33,"to":301,"color":2027,"variant":2028},"neutral","subtle",{"label":25,"icon":28,"to":26,"color":2027,"variant":2028},{},{"title":450,"icon":434},{"title":583,"description":2023},"LtjcmPV9_rG6QETXqZHaMkObHoM8_P-lblYpnPD3LkA",[2035,2037],{"title":445,"path":446,"stem":447,"description":2036,"icon":448,"children":-1},"One evlog wide event per eve agent turn: token usage, tool executions, and business context, through your own drains and tail sampling.",{"title":454,"path":455,"stem":456,"description":2038,"icon":457,"children":-1},"Ship evlog inside a reusable package: attribute your events, throw catalog errors, and leave drains and sampling to the host application.",1789074370785]