hono 4.13.3: Jwt

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify hono.Jwt in pkg:npm/hono@4.13.3
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/hono@4.13.3
Demonstrate these symbols/APIs:
  - hono.Jwt

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:95bc6ebfe7c6ed0259e5ca336cab898d594a79bfc8512900287228b364bd1e13","contract":["sign creates a signed JWT string with three segments for payload and secret","decode extracts header and payload claims without verifying signature","verify validates signature and returns payload, rejecting incorrect secret or corrupted token","jwt middleware requires alg option and authenticates requests with valid Bearer token","jwt middleware rejects requests without valid Bearer token with 401 Unauthorized"],"goal":"verify hono.Jwt in pkg:npm/hono@4.13.3","kind":"HOW","packages":["pkg:npm/hono@4.13.3"],"schemaVersion":1,"symbols":["hono.Jwt"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/hono@4.13.3"],"schemaVersion":1,"subject":"pkg:npm/hono@4.13.3","symbols":["hono.Jwt"],"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-hono-jwt",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-hono-jwt",
      "version": "1.0.0",
      "dependencies": {
        "hono": "4.13.3"
      }
    },
    "node_modules/hono": {
      "version": "4.13.3",
      "resolved": "https://registry.npmjs.org/hono/-/hono-4.13.3.tgz",
      "integrity": "sha512-r8AO2mYHoLxSHkgafNeC/BXyb2vWRxD3jem4Ts+ptav8oTG5FIRifAjuJEmZI4bSvvc2ns0GxmIYiZnHqN3mMw==",
      "license": "MIT",
      "engines": {
        "node": ">=16.9.0"
      }
    }
  }
}

{
  "name": "sample-hono-jwt",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification for hono.Jwt in pkg:npm/hono@4.13.3",
  "type": "module",
  "dependencies": {
    "hono": "4.13.3"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify hono.Jwt in pkg:npm/hono@4.13.3",
  "kind": "HOW",
  "packages": [
    "pkg:npm/hono@4.13.3"
  ],
  "symbols": [
    "hono.Jwt"
  ]
}

import { Hono } from 'hono';
import { jwt, sign, verify, decode } from 'hono/jwt';

export async function createToken(payload, secret, alg = 'HS256') {
  return await sign(payload, secret, alg);
}

export function decodeToken(token) {
  return decode(token);
}

export async function verifyToken(token, secret, alg = 'HS256') {
  return await verify(token, secret, alg);
}

export function createProtectedApp(secret, alg = 'HS256') {
  const app = new Hono();
  app.use('/api/*', jwt({ secret, alg }));
  app.get('/api/me', (c) => {
    const payload = c.get('jwtPayload');
    return c.json({ user: payload });
  });
  return app;
}

export { jwt, sign, verify, decode };

import assert from 'node:assert/strict';
import {
  createToken,
  decodeToken,
  verifyToken,
  createProtectedApp,
  jwt,
  sign,
  verify,
  decode
} from '../src/index.mjs';

const SECRET = 'sample-verification-secret-key-32bytes!';

// Contract 1: sign creates a signed JWT string with three segments for payload and secret
{
  assert.equal(typeof sign, 'function');
  const payload = { sub: 'usr_1001', role: 'admin' };
  const token = await createToken(payload, SECRET, 'HS256');
  assert.equal(typeof token, 'string');
  const parts = token.split('.');
  assert.equal(parts.length, 3);
}

// Contract 2: decode extracts header and payload claims without verifying signature
{
  assert.equal(typeof decode, 'function');
  const payload = { sub: 'usr_1002', name: 'Alice' };
  const token = await createToken(payload, SECRET, 'HS256');
  const decoded = decodeToken(token);
  assert.equal(typeof decoded, 'object');
  assert.equal(decoded.header.alg, 'HS256');
  assert.equal(decoded.payload.sub, 'usr_1002');
  assert.equal(decoded.payload.name, 'Alice');
}

// Contract 3: verify validates signature and returns payload, rejecting incorrect secret or corrupted token
{
  assert.equal(typeof verify, 'function');
  const payload = { sub: 'usr_1003' };
  const token = await createToken(payload, SECRET, 'HS256');
  const verified = await verifyToken(token, SECRET, 'HS256');
  assert.equal(verified.sub, 'usr_1003');

  await assert.rejects(async () => {
    await verifyToken(token, 'wrong-secret-key-32bytes!', 'HS256');
  });

  const parts = token.split('.');
  const tampered = `${parts[0]}.eyJzdWIiOiJ1c3JfOTk5OSJ9.${parts[2]}`;
  await assert.rejects(async () => {
    await verifyToken(tampered, SECRET, 'HS256');
  });
}

// Contract 4: jwt middleware requires alg option and authenticates requests with valid Bearer token
{
  assert.equal(typeof jwt, 'function');
  assert.throws(() => {
    jwt({ secret: SECRET });
  }, /requires options for "alg"/);

  const app = createProtectedApp(SECRET, 'HS256');
  const token = await createToken({ sub: 'usr_1004' }, SECRET, 'HS256');
  const res = await app.request('http://localhost/api/me', {
    headers: { Authorization: `Bearer ${token}` }
  });
  assert.equal(res.status, 200);
  const data = await res.json();
  assert.equal(data.user.sub, 'usr_1004');
}

// Contract 5: jwt middleware rejects requests without valid Bearer token with 401 Unauthorized
{
  const app = createProtectedApp(SECRET, 'HS256');

  const noAuthRes = await app.request('http://localhost/api/me');
  assert.equal(noAuthRes.status, 401);

  const invalidRes = await app.request('http://localhost/api/me', {
    headers: { Authorization: 'Bearer bad.token.value' }
  });
  assert.equal(invalidRes.status, 401);
}

console.log('All contracts passed.');