Send buffer POST request?

Question

Node.js

You need to send a POST request with a buffer. The problem is that Node.js requires either a string or a buffer .

// Делаю стандартными средствами Node.js, так как нагляднее

const http = require('http');

const postData = {
  'encodedText': buffer
};

const req = http.request();

req.write(postData);
req.end();

I end up with an error

TypeError [ERR_INVALID_ARG_TYPE]: The first argument must be one of type string or Buffer. Received type object