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query-profiler

Koa

Koa 3: CI runs it with @koa/router and @koa/bodyparser, and a route that reads a large JSON body keeps its profile. Your server’s code does not change: follow Setup to install the package, profile the Prisma client and add the preload.

The dev command

Section titled “The dev command”
{
  "scripts": {
    "dev": "tsx watch --import query-profiler/register src/server.ts",
    "start": "node dist/server.js"
  }
}

In plain JavaScript, node --watch --import query-profiler/register src/server.js. Other watchers are in Setup.

CORS

Section titled “CORS”

With @koa/cors, a page on another origin can read X-Debug-Token: the preload exposes it. If you set exposeHeaders, your list replaces it, so add the token there:

app.use(cors({ origin: "http://localhost:5173", exposeHeaders: ["X-Debug-Token"] }));

In production no response carries it, so the extra name does nothing.