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You have the request ID from the client. Your logs should let you find the payment amount, the outcome, and the reason for the decline together.",[619,623,624,625,629],{},"Build a small Node.js HTTP server that records those details in one JSON ",[626,627,628],"a",{"href":52},"wide event"," per request. You will run a successful checkout and a declined payment, then match each response to its log. The example uses Node’s built-in HTTP server so you can see the full logging lifecycle.",[631,632,634],"h2",{"id":633},"run-a-complete-http-handler","Run a complete HTTP handler",[619,636,637],{},"Install evlog, then save the server below. It uses the Node.js HTTP server and no framework. Node.js 24 can run this TypeScript file directly:",[639,640,646],"pre",{"className":641,"code":642,"filename":643,"language":644,"meta":645,"style":645},"language-bash shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","npm install evlog\nnode server.ts\n","Terminal","bash","",[647,648,649,665],"code",{"__ignoreMap":645},[650,651,654,658,662],"span",{"class":652,"line":653},"line",1,[650,655,657],{"class":656},"sBMFI","npm",[650,659,661],{"class":660},"sfazB"," install",[650,663,664],{"class":660}," evlog\n",[650,666,668,671],{"class":652,"line":667},2,[650,669,670],{"class":656},"node",[650,672,673],{"class":660}," server.ts\n",[619,675,676,677,680,681,684],{},"The ",[647,678,679],{},"\u002Fcheckout"," route simulates a successful payment. Add ",[647,682,683],{},"?decline=1"," to exercise the error path. The payment IDs are fixture data, so no payment provider or credentials are needed.",[639,686,691],{"className":687,"code":688,"filename":689,"language":690,"meta":645,"style":645},"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",[647,692,693,722,742,774,781,833,838,867,916,931,982,1008,1037,1042,1050,1098,1115,1146,1191,1197,1203,1208,1271,1315,1327,1345,1358,1375,1392,1400,1405,1410,1458,1473,1512,1530,1573,1601,1615,1654,1664,1693,1699],{"__ignoreMap":645},[650,694,695,699,703,707,710,713,716,719],{"class":652,"line":653},[650,696,698],{"class":697},"s7zQu","import",[650,700,702],{"class":701},"sMK4o"," {",[650,704,706],{"class":705},"sTEyZ"," randomUUID",[650,708,709],{"class":701}," }",[650,711,712],{"class":697}," from",[650,714,715],{"class":701}," 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402\n",[650,1616,1618,1620,1622,1624,1626,1628,1630,1632,1634,1636,1638,1640,1642,1644,1646,1648,1650,1652],{"class":652,"line":1617},39,[650,1619,1463],{"class":705},[650,1621,891],{"class":701},[650,1623,1155],{"class":786},[650,1625,790],{"class":796},[650,1627,1160],{"class":705},[650,1629,891],{"class":701},[650,1631,1165],{"class":786},[650,1633,790],{"class":796},[650,1635,793],{"class":701},[650,1637,1172],{"class":796},[650,1639,800],{"class":701},[650,1641,715],{"class":701},[650,1643,1339],{"class":660},[650,1645,815],{"class":701},[650,1647,754],{"class":701},[650,1649,923],{"class":705},[650,1651,709],{"class":701},[650,1653,1190],{"class":796},[650,1655,1657,1659,1662],{"class":652,"line":1656},40,[650,1658,1517],{"class":701},[650,1660,1661],{"class":697}," finally",[650,1663,866],{"class":701},[650,1665,1667,1669,1671,1674,1676,1678,1681,1683,1685,1687,1689,1691],{"class":652,"line":1666},41,[650,1668,1213],{"class":705},[650,1670,891],{"class":701},[650,1672,1673],{"class":786},"emit",[650,1675,790],{"class":796},[650,1677,793],{"class":701},[650,1679,1680],{"class":796}," status",[650,1682,800],{"class":701},[650,1684,856],{"class":705},[650,1686,891],{"class":701},[650,1688,1108],{"class":705},[650,1690,709],{"class":701},[650,1692,832],{"class":796},[650,1694,1696],{"class":652,"line":1695},42,[650,1697,1698],{"class":701},"  }\n",[650,1700,1702,1705,1707,1709,1712,1714,1717],{"class":652,"line":1701},43,[650,1703,1704],{"class":701},"}",[650,1706,859],{"class":705},[650,1708,891],{"class":701},[650,1710,1711],{"class":786},"listen",[650,1713,790],{"class":705},[650,1715,1716],{"class":1113},"3000",[650,1718,832],{"class":705},[619,1720,1721],{},"Send both requests from another terminal:",[639,1723,1725],{"className":641,"code":1724,"filename":643,"language":644,"meta":645,"style":645},"curl -i -X POST http:\u002F\u002Flocalhost:3000\u002Fcheckout\ncurl -i -X POST 'http:\u002F\u002Flocalhost:3000\u002Fcheckout?decline=1'\n",[647,1726,1727,1744],{"__ignoreMap":645},[650,1728,1729,1732,1735,1738,1741],{"class":652,"line":653},[650,1730,1731],{"class":656},"curl",[650,1733,1734],{"class":660}," -i",[650,1736,1737],{"class":660}," -X",[650,1739,1740],{"class":660}," POST",[650,1742,1743],{"class":660}," http:\u002F\u002Flocalhost:3000\u002Fcheckout\n",[650,1745,1746,1748,1750,1752,1754,1756,1759],{"class":652,"line":667},[650,1747,1731],{"class":656},[650,1749,1734],{"class":660},[650,1751,1737],{"class":660},[650,1753,1740],{"class":660},[650,1755,715],{"class":701},[650,1757,1758],{"class":660},"http:\u002F\u002Flocalhost:3000\u002Fcheckout?decline=1",[650,1760,721],{"class":701},[631,1762,1764],{"id":1763},"read-the-result","Read the 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