{"id":17523,"library":"chai-connect-middleware","title":"Chai Connect Middleware","description":"The `chai-connect-middleware` package provides helper functions specifically designed for testing Connect.js middleware using the Chai assertion library. Its sole stable version, 0.3.1, was published in January 2014. Given its last update was over a decade ago and it targets very old Node.js versions (specifically, `>= 0.4.0`), this library is no longer actively maintained, and future releases are not expected. This utility enables developers to wrap Connect middleware execution, allowing for precise control over the simulated `req` and `res` objects and handling the middleware's invocation of `next()` or `end()` for assertion purposes. While it offered a specialized approach to middleware testing, contemporary practices for testing Connect or Express middleware often leverage higher-level HTTP testing libraries like Supertest or `chai-http`, or directly unit test middleware functions. This makes `chai-connect-middleware` largely obsolete in modern JavaScript development workflows.","status":"abandoned","version":"0.3.1","language":"javascript","source_language":"en","source_url":"git://github.com/jaredhanson/chai-connect-middleware","tags":["javascript","chai","connect","express","middleware"],"install":[{"cmd":"npm install chai-connect-middleware","lang":"bash","label":"npm"},{"cmd":"yarn add chai-connect-middleware","lang":"bash","label":"yarn"},{"cmd":"pnpm add chai-connect-middleware","lang":"bash","label":"pnpm"}],"dependencies":[],"imports":[{"note":"This package, and its dependency 'chai' in the context of its release, are CommonJS-only. ESM imports will fail.","wrong":"import chai from 'chai';","symbol":"chai","correct":"const chai = require('chai');"},{"note":"The package is CommonJS-only. Direct ESM imports are not supported.","wrong":"import connect from 'chai-connect-middleware';","symbol":"connectMiddlewarePlugin","correct":"const connect = require('chai-connect-middleware');"},{"note":"This is the standard way to register Chai plugins, making the `.connect` helper available.","symbol":"usePlugin","correct":"chai.use(connect);"}],"quickstart":{"code":"const chai = require('chai');\nconst connect = require('chai-connect-middleware');\nconst expect = chai.expect;\n\nchai.use(connect);\n\n// A dummy Connect/Express-style middleware for demonstration\nfunction dummyMiddleware(req, res, next) {\n  if (req.query && req.query.hello) {\n    res.body = `Hello, ${req.query.hello}`;\n    res.statusCode = 200;\n    res.end();\n  } else {\n    next();\n  }\n}\n\ndescribe('middleware test', function() {\n  let resResult;\n    \n  before(function(done) {\n    chai.connect(dummyMiddleware)\n      .req(function(req) {\n        req.query = { hello: 'World' };\n        req.method = 'GET'; // Often needed for robust middleware testing\n        req.url = '/';\n      })\n      .end(function(r) {\n        resResult = r;\n        done();\n      })\n      .dispatch(new Error('Middleware did not call next() or end()'));\n  });\n\n  it('should send correct body', function() {\n    expect(resResult.body).to.equal('Hello, World');\n  });\n\n  it('should have a 200 status code', function() {\n    expect(resResult.statusCode).to.equal(200);\n  });\n});\n","lang":"javascript","description":"This quickstart demonstrates how to use `chai-connect-middleware` with Mocha to test a simple Connect-style middleware, simulating a request and asserting on the response."},"warnings":[{"fix":"Consider using modern middleware testing libraries like `supertest` or `chai-http` which are actively maintained and compatible with current Node.js versions and testing paradigms.","message":"This package targets Node.js versions `>=0.4.0`, which are extremely outdated. It will likely not run on modern Node.js versions due to fundamental API changes and lack of maintenance.","severity":"breaking","affected_versions":">=0.3.1"},{"fix":"Migrate to actively maintained libraries such as `supertest` for integration testing of HTTP endpoints, or directly unit test middleware functions using mocks for `req`, `res`, and `next`.","message":"The package's last update was over 10 years ago, and its dependencies (Connect.js, older Chai versions) are also largely outdated or superseded. Modern testing patterns for HTTP middleware have evolved beyond this specific utility.","severity":"deprecated","affected_versions":">=0.3.1"},{"fix":"If you must use this package in a mixed environment, ensure it is `require()`d from a CommonJS context. For new projects, prefer ESM-compatible testing tools.","message":"This package is CommonJS-only and does not support ES Modules (`import`/`export`) syntax directly. Attempting to use it in an ESM environment will result in module resolution errors.","severity":"gotcha","affected_versions":">=0.3.1"},{"fix":"Avoid using unmaintained software in production-critical test suites. Regularly audit your dependency tree and prioritize active projects for testing infrastructure.","message":"Security vulnerabilities may exist in this unmaintained package or its transitive dependencies. As it hasn't received updates in over a decade, any discovered security flaws would remain unpatched.","severity":"gotcha","affected_versions":">=0.3.1"}],"env_vars":null,"last_verified":"2026-04-23T00:00:00.000Z","next_check":"2026-07-22T00:00:00.000Z","problems":[{"fix":"Ensure your test file uses CommonJS (`.js` files without `\"type\": \"module\"` in `package.json`, or explicitly using `require()`).","cause":"Attempting to `import` this CommonJS-only package in an ES Module context.","error":"TypeError: require is not a function"},{"fix":"Run `npm install chai-connect-middleware` to install the package.","cause":"The package is not installed or not resolvable in the current environment.","error":"Error: Cannot find module 'chai-connect-middleware'"},{"fix":"Add `chai.use(connect);` after requiring both `chai` and `chai-connect-middleware`.","cause":"The `chai-connect-middleware` plugin has not been registered with Chai via `chai.use(connect)`.","error":"TypeError: chai.connect is not a function"}],"ecosystem":"npm","meta_description":null,"install_score":null,"install_tag":null,"quickstart_score":null,"quickstart_tag":null}