In Express.js, should I return response or not?

Question

For Express.js 4.x I can't find wether I should return the response (or next function) or not, so:

This:

app.get('/url', (req, res) => {
    res.send(200, { message: 'ok' });
});

Or this:

app.get('/url', (req, res) => {
    return res.send(200, { message: 'ok' });
});

And what is the difference?

Answer 1

I do not agree with the answer above. Sometimes the callback function can return several responses depending on the logic of the app:

router.post("/url", function(req, res) {
// (logic1)
     res.send(200, { response: 'response 1' });
   // (logic2) 
      res.send(200, { message: 'response 2' });
    }})  

This will throw this error:

Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client

Which can actually be solved with using return. It can also be solved with using if else clauses.