uWebSockets.js/examples/JsonPost.js

/* Simple example of getting JSON from a POST */

const uWS = require('../dist/uws.js');
const port = 9001;

const app = uWS./*SSL*/App({
  key_file_name: 'misc/key.pem',
  cert_file_name: 'misc/cert.pem',
  passphrase: '1234'
}).post('/*', (res, req) => {

  /* Note that you cannot read from req after returning from here */
  let url = req.getUrl();

  /* Read the body until done or error */
  readJson(res, (obj) => {
    console.log('Posted to ' + url + ': ');
    console.log(obj);

    res.end('Thanks for this json!');
  }, () => {
    /* Request was prematurely aborted or invalid or missing, stop reading */
    console.log('Invalid JSON or no data at all!');
  });

}).listen(port, (token) => {
  if (token) {
    console.log('Listening to port ' + port);
  } else {
    console.log('Failed to listen to port ' + port);
  }
});

/* Helper function for reading a posted JSON body */
function readJson(res, cb, err) {
  let buffer;
  /* Register data cb */
  res.onData((ab, isLast) => {
    let chunk = Buffer.from(ab);
    if (isLast) {
      let json;
      if (buffer) {
        try {
          json = JSON.parse(Buffer.concat([buffer, chunk]));
        } catch (e) {
          /* res.close calls onAborted */
          res.close();
          return;
        }
        cb(json);
      } else {
        try {
          json = JSON.parse(chunk);
        } catch (e) {
          /* res.close calls onAborted */
          res.close();
          return;
        }
        cb(json);
      }
    } else {
      if (buffer) {
        buffer = Buffer.concat([buffer, chunk]);
      } else {
        buffer = Buffer.concat([chunk]);
      }
    }
  });

  /* Register error cb */
  res.onAborted(err);
}