modify response in express/nodejs - node.js

Question

i am making multiple streamdata in Nodejs using express.
this is how i make a url:
app.get('/temp/1', function(req, res){
res.send('hello, i am not modified')
})
my question is: is it possible to modify the response of that url?
i tried like this:
app.get(/modify/1, function(req, res){
app.get('/temp/1', function(req, res){
res.send('hello, i am modified')
})
res.send('done');
}
So i would think that the response is changed, but nothing happens actually.
is there a way to achieve it?

Answer 1

Here's an example using express-modify-response:
const modifyResponse = require('express-modify-response');
...
let modify = modifyResponse(
function(req, res) { return true }, // always modify the response
function(req, res, body) { return 'hello, i am modified' } // the new response
);
app.get('/temp/1', modify, function(req, res){
res.send('hello, i am not modified')
})
EDIT: second attempt. You have an endpoint /temp/1 that sends a particular response, and you want an endpoint /modify/1 that will take that response and modify it.
This calls for some abstraction:
function someFunction(id) {
return 'hello, i am not modified';
}
app.get('/temp/1', function(req, res) {
res.send(someFunction(1));
});
app.get('/modify/1', function(req, res) {
let value = someFunction(1);
// Remove the word `not`.
value = value.replace(/not /, '');
res.send(value);
});
So both handlers use the same function, that provides the actual output, but /modify/1 modifies the output before returning it to the client.