var expressModifyResponse = require('express-modify-response');
var app = ...
app.use(expressModifyResponse(
(req, res) => {
// return true if you want to modify the response later
if (res.getHeader('Content-Type').startsWith('text/html')) return true;
return false;
},
(req, res, body) => {
// body is a Buffer with the current response; return Buffer or string with the modified response
// can also return a Promise.
return body.toString() + '<script>console.log("hello");</script>';
}
));