A lightweight local HTTPS proxy library for Nest framework apps (Express or Fastify) 🔀

Description

A lightweight local HTTPS proxy library for Nest framework apps, supporting both Express and Fastify HTTP adapters, designed for use with self-signed SSL certificates.

⚠ Disclaimer

This library is intended only for use in local development, testing, and troubleshooting with self-signed SSL certificates. It is not recommended to use this in any production context or public-facing environment.

Always follow best practices when managing SSL certificates for any public-facing or production environment.

Self-signed SSL Certificates

See the following gist for info on creating self-signed SSL certificate PEM files using openssl:

• Create a self-signed SSL certificate for local development and testing

Installation

$ npm i nest-local-https-proxy

Implementation

1. Load your certificate and private key files into an HTTPS options (SecureContextOptions) object.

   const certPath = './cert.pem';
   const keyPath = './key.pem';
   let httpsOptions: SecureContextOptions;
   // Confirm local certificate files exist
   if (fs.existsSync(certPath) && fs.existsSync(keyPath)) {
     httpsOptions = {
       cert: fs.readFileSync(certPath),
       key: fs.readFileSync(keyPath),
     };
   } else {
     console.log('Failed to initalize HTTPS certificates for local SSL proxy');
   }

2. Instatiate the LocalHttpsProxy class, providing your NestApplication instance, and the HTTPS options object.

   const httpsDevProxy = new LocalHttpsProxy(app, httpsOptions);

3. (Optional) Provide callback functions to constructor or subscribe to events on LocalHttpsProxy instance.

   • Provide callback functions to constructor:

     const errorCallback = (error) => { console.error(`HTTPS proxy error occurred: ${error.message}`); };
     const listeningCallback = (httpsPort) => { console.log(`HTTPS listening on ${httpsPort}`); };
     const httpsDevProxy = new LocalHttpsProxy(app, httpsOptions, errorCallback, listeningCallback);

   • Subscribe to events:

     httpsDevProxy.on('listening', (httpsPort) => {
       console.log(`HTTPS listening on ${httpsPort}`);
     });
     httpsDevProxy.on('error', (error) => {
       console.error(`HTTPS proxy error occurred: ${error.message}`);
     });

4. Start the proxy

   httpsDevProxy.start(port);

Test

# unit tests
$ npm run test

# test coverage
$ npm run test:cov

License

The nest-local-https-proxy project is MIT licensed.