How to fix hostname/IP does not match certificate’s altnames with Node.js and JavaScript?

To fix hostname/IP does not match certificate’s altnames with Node.js and JavaScript, we create a proxy.

For instance, we write

const httpProxy = require("http-proxy");
const proxy = httpProxy.createProxyServer();

proxy.web(req, res, {
  changeOrigin: true,
  target: "https://example.com:3000",
});

to create a proxy with the http-proxy package.

We call createProxyServer to create the proxy.

And we set the target to the destination URL to proxy to.

If we’re using HTTPS, we write

const httpProxy = require("http-proxy");

httpProxy
  .createServer({
    ssl: {
      key: fs.readFileSync("valid-ssl-key.pem", "utf8"),
      cert: fs.readFileSync("valid-ssl-cert.pem", "utf8"),
    },
    target: "https://example.com:3000",
    secure: true,
  })
  .listen(443);

to call createServer to create the proxy server.

We set the SSL key and certificate files.

And we set the target to the destination URL to proxy to.

We set secure to true to let us proxy HTTPS traffic.