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Each page in this section ships with a ",[600,601,602],"code",{},"::prompt"," block you can drop into Cursor \u002F Claude to scaffold the integration in your own app.",[605,606,608],"h2",{"id":607},"mental-model","Mental model",[610,611,617],"pre",{"className":612,"code":614,"language":615,"meta":616},[613],"language-text","your app code\n     │\n     │  emit\n     ▼\n┌──────────────────────────────────────────────────────────────────┐\n│   evlog pipeline                                                 │\n│                                                                  │\n│   request lifecycle  →  enrich  →  tail sample  →  drain         │\n│                                                                  │\n└──────────────────────────────────────────────────────────────────┘\n     │                                                  │\n     │  observe (no mutation)                           │  ship\n     ▼                                                  ▼\n┌─────────────────────────────────────────┐    ┌─────────────────────┐\n│   stream (in-process + SSE bridge)      │    │   custom drains     │\n│   fs reader (NDJSON history)            │    │   drain pipeline    │\n│   diagnostics channel (evlog.event)     │    │   (batch + fanout)  │\n│   consumer recipes (devtools, dashboards)│    │                     │\n└─────────────────────────────────────────┘    └─────────────────────┘\n","text","",[600,618,614],{"__ignoreMap":616},[605,620,622],{"id":621},"three-ways-to-extend","Three ways to extend",[624,625,627],"h3",{"id":626},"observe-the-pipeline-no-mutation","Observe the pipeline (no mutation)",[583,629,630,631,634,635,638],{},"Subscribe to events without changing what gets emitted. The stream is the live feed, the fs reader is the historic log, the diagnostics channel lets a consumer subscribe by channel name alone, and consumer recipes show you how to wire any of them to a devtool, dashboard, CLI tail, or ",[600,632,633],{},"curl"," + ",[600,636,637],{},"jq",".",[640,641,642,655],"table",{},[643,644,645],"thead",{},[646,647,648,652],"tr",{},[649,650,651],"th",{},"You want to…",[649,653,654],{},"Use",[656,657,658,669,678,692],"tbody",{},[646,659,660,664],{},[661,662,663],"td",{},"Subscribe to live events (in-process or over SSE for browsers \u002F CLIs)",[661,665,666],{},[667,668,463],"a",{"href":464},[646,670,671,674],{},[661,672,673],{},"Replay or tail historic events from disk",[661,675,676],{},[667,677,477],{"href":478},[646,679,680,687],{},[661,681,682,683,634,685],{},"Build a small consumer panel, devtool, or pipe to ",[600,684,633],{},[600,686,637],{},[661,688,689],{},[667,690,691],{"href":482},"Consumer recipes",[646,693,694,697],{},[661,695,696],{},"Let a consumer subscribe without importing evlog, or reach a Cloudflare Tail Worker",[661,698,699],{},[667,700,473],{"href":474},[624,702,704],{"id":703},"plug-into-the-pipeline","Plug into the pipeline",[583,706,707,708,711],{},"Hook into the pipeline at one or more of its lifecycle stages. The four pages below cover the entire extension surface. Pick one when you have a single concern, pick ",[600,709,710],{},"definePlugin"," when you have several.",[640,713,714,722],{},[643,715,716],{},[646,717,718,720],{},[649,719,651],{},[649,721,654],{},[656,723,724,733,742,751],{},[646,725,726,729],{},[661,727,728],{},"React to lifecycle events from a single cohesive object (multiple hooks share state)",[661,730,731],{},[667,732,486],{"href":487},[646,734,735,738],{},[661,736,737],{},"Add a derived field on every event automatically",[661,739,740],{},[667,741,490],{"href":491},[646,743,744,747],{},[661,745,746],{},"Decide post-hoc whether to keep an event (status, duration, custom logic)",[661,748,749],{},[667,750,494],{"href":495},[646,752,753,764],{},[661,754,755,756,759,760,763],{},"Identify your evlog traffic on the receiver side (override ",[600,757,758],{},"User-Agent"," \u002F ",[600,761,762],{},"X-Evlog-Source",")",[661,765,766],{},[667,767,498],{"href":499},[624,769,771],{"id":770},"build-your-own-bricks","Build your own bricks",[583,773,774],{},"When the built-in adapters or framework integrations don't cover what you need, the toolkit lets you build your own with the same shape and ergonomics.",[640,776,777,785],{},[643,778,779],{},[646,780,781,783],{},[649,782,651],{},[649,784,654],{},[656,786,787,796,805],{},[646,788,789,792],{},[661,790,791],{},"Ship events to a backend without a built-in adapter (HTTP or any other transport)",[661,793,794],{},[667,795,503],{"href":504},[646,797,798,801],{},[661,799,800],{},"Wrap any drain in batch + retry + fanout for production",[661,802,803],{},[667,804,508],{"href":509},[646,806,807,810],{},[661,808,809],{},"Support a framework that's not in the list, or a non-HTTP runtime",[661,811,812],{},[667,813,814],{"href":469},"Custom framework integration",[605,816,818],{"id":817},"what-works-where","What works where",[583,820,821,822,825,826,829,830,833],{},"Only the ",[667,823,824],{"href":464},"stream"," (in-process bus + SSE bridge) is ",[587,827,828],{},"local-only",": it lives inside one Node \u002F Bun \u002F Deno process and does not work on serverless platforms (Vercel Functions, Cloudflare Workers, AWS Lambda). The ",[667,831,832],{"href":464},"stream page"," explains the constraint in detail.",[583,835,836,837,839,840,839,843,839,846,839,849,839,852,839,855,839,858,861],{},"Everything else, from ",[667,838,477],{"href":478},", ",[667,841,842],{"href":487},"plugins",[667,844,845],{"href":491},"custom enrichers",[667,847,848],{"href":495},"tail sampling",[667,850,851],{"href":499},"identity headers",[667,853,854],{"href":504},"custom drains",[667,856,857],{"href":509},"drain pipeline",[667,859,860],{"href":469},"custom framework integration",", runs everywhere evlog runs.",{"title":616,"searchDepth":863,"depth":863,"links":864},2,[865,866,872],{"id":607,"depth":863,"text":608},{"id":621,"depth":863,"text":622,"children":867},[868,870,871],{"id":626,"depth":869,"text":627},3,{"id":703,"depth":869,"text":704},{"id":770,"depth":869,"text":771},{"id":817,"depth":863,"text":818},"Observe what flows through the pipeline, plug into it, or build your own bricks. The map of every extension point evlog exposes.","md",[876,880,881],{"label":463,"icon":877,"to":464,"color":878,"variant":879},"i-lucide-radio","neutral","subtle",{"label":486,"icon":461,"to":487,"color":878,"variant":879},{"label":882,"icon":506,"to":504,"color":878,"variant":879},"Custom Drains",{},{"title":41,"icon":461},{"title":578,"description":873},"V_xDrKj8z8Ae6zV4vG6-iM5Kremy5pcLHNHZIqRw0Ss",[888,890],{"title":450,"path":451,"stem":452,"description":889,"icon":434,"children":-1},"Build a Node.js HTTP handler with structured request logs, explicit outcomes, error context, and a JSON event you can query.",{"title":463,"path":464,"stem":465,"description":891,"icon":466,"children":-1},"Subscribe to wide events flowing through evlog — in-process with createStreamDrain, or over the network with the local SSE stream server.",1790280230388]