I am using Twitter API by the package Twitter for Node.js.

Right now I succeed reading tweets using stream, but I failed to write tweets. I got 401 error which means Unauthorized according to Twitter Developer Documentation.

The code is here:

const Twitter = require('twitter');

const twitterClient = new Twitter({
  consumer_key: TwitterConsumerKey,
  consumer_secret: TwitterConsumerSecret,
  access_token_key: TwitterAccessTokenKey,
  access_token_secret: TwitterAccessTokenSecret
});

twitterClient.post('statuses/update', { status: 'Hello World!' },  (err, tweet, res) => {
  if (err) throw err;
  console.log(tweet);
  console.log(res);
});

I did give write access. What could be other reasons causing this? Thanks