Javascript node-fetch usage

Question

I can get the data by request from this code.

let request = require('request');
let options = {
   'method': 'POST',
   'url': 'https://example.com/api',
   'headers': {
       'Content-Type': 'application/x-www-form-urlencoded'
   },
   form: {
       'client_id': '12345678',
       'client_secret': 'abcdefg'
   }
};
request(options, function (error, response) {
   if (error) throw new Error(error);
   console.log(response.body);
});

However, I got '404.00.001' when I use "fetch" to access the same API. Is there any thing wrong in this code?

const fetch = require("node-fetch");

const url = "https://example.com/api";

var headers = {
  'Content-Type': 'application/x-www-form-urlencoded'
};

var data = JSON.stringify( {
  'client_id': '12345678',
  'client_secret': 'abcdefg'
});

fetch(url, {method: 'POST', headers: headers, body: data})
  .then(response => response.json())
  .then((resp) => {
     console.log(resp);
  })
  .catch(error => console.error('Unable to fetch token.', error));

Answer 1

'Content-Type': 'application/x-www-form-urlencoded' does not say JSON so why do you have var data = JSON.stringify?

The documentation tells you how to encode data as form parameters.

const { URLSearchParams } = require('url');

const params = new URLSearchParams();
params.append('a', 1);