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express.js - how to intercept response.send() / response.json()

rated 0 times [ 137] [ 4] / answers: 1 / hits: 31769 / 9 Years ago, mon, november 16, 2015, 12:00:00

Lets say I have multiple places where I call response.send(someData). Now I want to create a single global interceptor where I catch all .send methods and make some changes to someData. Is there any way in express.js? (hooks, listeners, interceptors, ...)?

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rayvenc

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2 Years ago

answered 9 Years ago makaylahk · Accepted Answer

You can define a middleware as below (taken and modified from this answer)

function modifyResponseBody(req, res, next) {

    var oldSend = res.send;



    res.send = function(data){

        // arguments[0] (or `data`) contains the response body

        arguments[0] = modified :  + arguments[0];

        oldSend.apply(res, arguments);

    }

    next();

}



app.use(modifyResponseBody);