Send a stream of response NodeJS ExpressJS

Question

I would like to send back to the client a stream of responses from the npm twitter package.

The end-point looks like

var client = new Twitter({ consumer_key: '', consumer_secret: '', access_token_key: '', access_token_secret: '' }); app.get('/', function(req,res) { const stream = client.stream('statuses/filter', {track: 'crypto'}); stream.on('data', function(event) { res.status(200).json({tweet: event && event.text || 'nothing'}) }); });

The server responds once to the client app and then gives an error that headers are already sent Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client , how do I respond with a stream?

Thanks.

Muhammad Aadil Banaras · Accepted Answer · 2019-02-19 13:19:52Z

2

So, use

res.write().

It does not end it, so you can add call it multiple times, while after res.json & res.send you can't write to res more.

answered Feb 19, 2019 at 13:19

Muhammad Aadil Banaras

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5 Comments

Muhammad Aadil Banaras Over a year ago

and call res.end() after you have sent all data.

Thabo Over a year ago

Thanks @Muhammad Aadil Banara, and how do I get the response from the client side which is an angular app? I am now looking into socketio actuallu

Muhammad Aadil Banaras Over a year ago

No need to do any different thing for this, just call in the same way as we call in angular, one way to call in angular is like this. this.http.get('/app/test') .map((res:Response) => res.json()) .subscribe( data => { this.output = data}, err => console.error(err), () => console.log('done') );

Thabo Over a year ago

OK let me try it out

Thabo Over a year ago

Thanks but I have achieved using socket.io

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