how can I get response body in Express?

Question

I need to save request a response body in my NodeJS API. I use express.

I write tow middleware. first: process the client request.

app.use((req, res,next) => {

res.status(404).json({
    errors: [{
            field: "url",
            message: "not found"
        }]
});

next();

});

second: log or save the request and response body.

app.use((req, res,next) => {

console.log(req.body);
console.log(res); //here I want get response body

});

my question is how can I access to the response body in express? if there isn't any way how can I save request and response body in NodeJS?

ylc395 · Answer 1 · 2019-11-23T13:06:05.137

3

You should bind a callback for finish event of response

app.use((req, res,next) => {
    console.log(req.body);
    res.on('finish', () => console.log(res)); //get response body in callback
});

because the response object is not fully available when the middleware is executed.

edited Nov 23 '19 at 13:06

answered Nov 23 '19 at 12:46

ylc395

93
1
5

not work. it loges nothing. – MohammadJavad Abbasi Nov 23 '19 at 12:53
@MohammadJavadAbbasi sorry, check out my latest edition – ylc395 Nov 23 '19 at 13:06
1

I just want response body. but this code get all method and data about response. and I can't find response body. – MohammadJavad Abbasi Nov 23 '19 at 13:19
@MohammadJavadAbbasi check this: https://stackoverflow.com/questions/52310461/node-js-express-how-to-log-the-request-body-and-response-body/52311152 – ylc395 Nov 23 '19 at 13:33

how can I get response body in Express?

1 Answers1