How to post JSON via Node.js without using `request`?

Question

The previous answer requires the request component, of which I like to avoid using, due to academic purpose and other related policy. With vanilla Node.js 8.4.0, I tried:

var https = require('https');
var sendData = {
  api_key: 'abc',
  api_secret: '123',
  image_url: 'http://lalala.com/123/lalala.jpg',
  return_attributes: ['gender','age']
};
var options = {
  hostname: 'lalala.com',
  port: '443',
  path: '/info',
  method: 'POST',
  rejectUnauthorized: false,
  requestCert: true,
  headers: {
    'Content-Type': 'application/json',
  }
};
var openreq = https.request(options, function(serverFeedback){
  if (serverFeedback.statusCode == 200) {
    var body = '';
    serverFeedback.on('data', (data)=>{ body += data; })
      .on('end', ()=>{
        console.log(body);
      });
  } else {
    console.log('failed');
  }
});
openreq.write(JSON.stringify(sendData))
openreq.end();

Sadly the code above results in failed output.

you want to send JSON to web server? You will have to use node modules like, https, request in order to do that, also you can put data inside options and the program will send the data inside req.body as a result of a post request — C.Unbay
– C.Unbay, Commented Sep 5, 2017 at 9:37
Add error handler: openreq.on('error', (e) => { console.error(e); }); to know what is the error reason. — alexmac
– alexmac, Commented Sep 5, 2017 at 9:40
You are not sending Content-Length in options.headers. No wonder the server rejects the request. Stringify sendData, then set Content-Length header and then send sendData. — freakish
– freakish, Commented Sep 5, 2017 at 10:00

Damaged Organic · Accepted Answer · 2017-09-05 10:13:50Z

There is nothing wrong with your request flow, as it almost exactly resembles Node.js documentation HTTP and HTTPS guides (apart from JSON Content-Type). However, you're only looking for 200 response and not expecting that error could have message in body that should be captured before serverFeedback.statusCode == 200 condition:

serverFeedback.setEncoding('utf8');
serverFeedback.on('data', (chunk) => {
  console.log(`BODY: ${chunk}`);
});
serverFeedback.on('end', () => {
  console.log('No more data in response.');
});

In any case, problem is definitely with the remote host then, and you could also observe response information more closely with:

console.log(`STATUS: ${serverFeedback.statusCode}`);
console.log(`HEADERS: ${JSON.stringify(serverFeedback.headers)}`);

Just one more thing, if you're using version 8, for the same academic purposes it's worth reconsidering utilization of var in favor of let & const, as well as fat arrow functions and Promises instead of callbacks.

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