Minimalist http echo server. Replies with the method, url, query and (json) body received on any endpoint. Run with `npm install && npm start`.

echo.js

var express = require("express"),
    app = express();
var bodyParser = require('body-parser');

function echo(req, res, next) {
    const queryStr = Object.entries(req.query).map(([key, val]) => `${key}=${val}`).join('&');
    const bodyStr = req.body ? JSON.stringify(req.body) : null;
    const response = req.method + ' ' + req.url + (queryStr && queryStr.length ? '?' + queryStr : '') + '\n' + (bodyStr ? bodyStr + '\n' : '');
    console.log(response);
    res.end(response);
}

app.use(bodyParser.json()); // support json encoded bodies
app.use(bodyParser.urlencoded({ extended: true })); // support encoded bodies

app.get("/*", echo);
app.post("/*", echo);
app.put("/*", echo);
app.delete("/*", echo);
app.head("/*", echo);
app.options("/*", echo);
app.patch("/*", echo);

console.log("Echo server listening on localhost:3000");
app.listen(3000);

package.json

{
  "name": "echo",
  "version": "1.0.0",
  "description": "Minimalist http echo server. Replies with the method, url, query and (json) body received on any endpoint. ",
  "main": "echo.js",
  "dependencies": {
    "body-parser": "^1.19.0",
    "express": "^4.17.1"
  },
  "devDependencies": {},
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "node echo.js"
  },
  "keywords": [
    "http",
    "echo",
    "server"
  ],
  "author": "Romain GUYOT de la HARDROUYERE",
  "license": "MIT"
}