express 5.1.0: Serve JSON with Express 5 on Bun, including a route parameter, a JSON body, a thrown handler and a 404

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  }
}

{"case":{"caseId":"case:sha256:c49d1adda6c49f5ec79934bd7d0f01b41c5b2eaf4717ec8d2f4dccafcd0590c1","constraints":{"runtime":"bun"},"contract":["serve a route parameter and a query string as JSON","parse a JSON body and answer 201","assert a handler that throws becomes a 500 rather than killing the process","assert an unmatched path is Express's own 404","assert the server is bound to loopback, since the stage has no network"],"goal":"Serve JSON with Express 5 on Bun, including a route parameter, a JSON body, a thrown handler and a 404","kind":"HOW","packages":["pkg:npm/express@5.1.0"],"schemaVersion":1,"symbols":["express","express.json","Application.listen"]},"contractCommand":["bun","test/contract.mjs"],"environment":{"arch":"x64","ecosystem":"npm","executionContext":"bun","language":"javascript","libc":"musl","moduleSystem":"esm","os":"linux","packageManager":"bun","runtime":"bun","runtimeVersion":"1","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/express@5.1.0"],"schemaVersion":1,"symbols":["express","express.json","Application.listen"],"verifierAdapter":"npm@1"}

{
  "name": "csx-express5-bun",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "dependencies": {
    "express": "5.1.0"
  }
}

import express from "express";

/**
 * Express 5 on whichever runtime this sample declares.
 *
 * The interesting part is that the file is identical in both: a route with
 * a parameter, a JSON body parser, a handler that throws, and a request for
 * a path that does not exist. Those four are where a Node-compatibility
 * layer usually diverges, because they lean on node:http semantics rather
 * than on Express itself — the thrown handler in particular has to travel
 * through Express's error handling and come back as a 500 rather than
 * killing the process.
 */
export function buildApp() {
  const app = express();
  app.use(express.json());
  app.get("/items/:id", (req, res) => res.json({ id: req.params.id, q: req.query }));
  app.post("/echo", (req, res) => res.status(201).json(req.body));
  app.get("/boom", () => {
    throw new Error("kaboom");
  });
  return app;
}

/** Listens on an ephemeral loopback port and resolves the base URL. */
export async function listen(app) {
  const server = app.listen(0, "127.0.0.1");
  await new Promise((resolve) => server.once("listening", resolve));
  return { server, base: `http://127.0.0.1:${server.address().port}` };
}

import assert from "node:assert/strict";

import { buildApp, listen } from "../src/app.mjs";

const { server, base } = await listen(buildApp());

try {
  const got = await fetch(`${base}/items/7?page=2`);
  assert.equal(got.status, 200);
  assert.deepEqual(await got.json(), { id: "7", q: { page: "2" } });

  const posted = await fetch(`${base}/echo`, {
    method: "POST",
    headers: { "content-type": "application/json" },
    body: JSON.stringify({ hello: "world" }),
  });
  assert.equal(posted.status, 201);
  assert.deepEqual(await posted.json(), { hello: "world" });

  // A handler that throws must become a 500, not an unhandled rejection
  // and not a dead process. This is the one most compatibility layers get
  // wrong, because it depends on how the request is dispatched.
  const boom = await fetch(`${base}/boom`);
  assert.equal(boom.status, 500);

  // And an unmatched path is Express's own 404, not the server's.
  const missing = await fetch(`${base}/nope`);
  assert.equal(missing.status, 404);

  // The server really is bound to loopback: the sandbox runs this stage
  // with no network at all, so anything else could not have answered.
  assert.match(base, /^http:\/\/127\.0\.0\.1:\d+$/);

  console.log("contract ok");
} finally {
  server.close();
}