Using twitter API get error sometimes

HTTP 420 is returned when you are being rate limited.

There is a https://publish.twitter.com/oembed resource URL, that is neither rate limited nor requires authentication. I think it returns the same things that your program expects. You can use that if you pass a query parameter url having the link to tweet. Try making the link like:

"https://publish.twitter.com/oembed?url=https://twitter.com/"+data.user.screen_name+"/statuses/"+data.id_str

For sample data returned by Twitter click here

As per pii_ke's response you should simply modify tweet_id as follows:

var tweet_id = "https://publish.twitter.com/oembed?url=https://twitter.com/" + data.user.screen_name + "/statuses/" + data.id_str;

Full modified code you can copy paste:

var Twitter=require('twitter');var lclconf = require('../config.json');var client=new Twitter({  consumer_key: lclconf.twitter.consumer_key,  consumer_secret: lclconf.twitter.consumer_secret,  access_token_key: lclconf.twitter.access_token_key,  access_token_secret: lclconf.twitter.access_token_secret});stream.on("data", function(data){  console.log(data.id_str);  var tweet_id = "https://publish.twitter.com/oembed?url=https://twitter.com/" + data.user.screen_name + "/statuses/" + data.id_str;  request.get(tweet_id)  .end(function(err,res){      if(err){        console.log("Error from Twitter API: " + err);      }else{        //console.log(res.body);        io.emit('tweet',res.body);      }  });});stream.on('error', function(err){  console.log("Error getting tweets: "+err);});io.on('connection', function(client){  client.on("join", function(data){    console.log(data);  });  client.emit("join",{"message":"running"});});