如何在 Express 中将价值从一条路线传递到另一条路线？

Question

I have a simple route that makes a POST request and returns an object with a number of values. I want to use one of the returned values in another (different) route for different logic. Is there a way to pass such data from one route to another?

router.post('/register', (req, res, next) => {

    // call some function that returns an object for use in another route eg:
    myFunction()
    .then((data) => {
        console.log(data)
    })
    .catch((err) => {
        console.log(err)
    })
});

router.post('/verify', (req, res, next) => {

    // use the data returned from the register route for verification logic 

});

Answer 1

You can use npm package connect-flash for passing data between routes

var express = require('express');
var flash = require('connect-flash');
var app = express();
app.use(flash());

app.get('/login', function(req, res){
  // Set a flash message by passing the key, followed by the value, to req.flash().
  req.flash('username', 'Gaurav Gupta')
  res.redirect('/profile');
});

app.get('/profile', function(req, res){
  // Get an array of flash messages by passing the key to req.flash()
  let message = req.flash('username')
  res.render('index', { message: message }); // or {message} only es6 feature
});

Or alternatively you can use middlewares on the routes

ie

router.post('/register', middleware(), (req, res) => {
   ...
});

//define middleware

function middleware(){
  return function(req, res, next){
    ...perform actions
    next()
  }
}

//reuse middleware in route

router.post('/verify', middleware(), (req, res) => {
   ...
});

Answer 2

You can try express-session to store the value in the session then read it from session variable. or you can create an encrypted token and send it to the user as register response, then in verify the route take the token and decrypt it.