在导出模块中传递多个参数

Question

I want to pass multiple argument in modules.exports . My code goes something like this:

Following file is a code snippet of index.js

var express        = require('express');
var app            = express();
var number = 100;
require('./app/routes')(app, number); // pass our application into our routes

Following is a code snippet of routes.js

module.exports = function(app, number){

app.get('/api/control', function(req,res){
  res.send("done");
});

app.post('/api/control', function(req,res){
  console.log(number);
  console.log(req.body);
  res.send("done");

});

}

The problem is when ever a POST request is made, console.log(number); prints undefined on terminal where as when I print when I replace number with app in console.log() it prints all the functions of app .

I also tried to switch the positions of app and number ,then it was throwing an error that app does not exists.

Answer 1

If you just want to pass the variable why not simply add it to the app object.

var express        = require('express');
var app            = express();
app.myNumber = 100;
require('./app/routes')(app); // pass our application into our routes

Then in the routes.js:

module.exports = function(app){

app.get('/api/control', function(req,res){
    res.send("done");
});

app.post('/api/control', function(req,res){
    console.log(app.myNumber);
    console.log(req.body);
    res.send("done");

});

}

Edited:

The following code will work to pass variables:

app.js:

var express        = require('express');
var app            = express();
var number = 100;
require('./app/routes')(app, number);

To pass the variable inside the function, you will have to bind it.

module.exports = function(app, number){

  app.get('/api/control', function(req,res){
    res.send("done");
  });

  app.post('/api/control', function(req,res){
      console.log(number);
      console.log(req.body);
      res.send("done");

  }.bind(number));

}

Answer 2

Do not do in that way ! Use the Router of expressJS and maybe the package Consign to pass multiple route file at once...

 const express = require('express'); const router = express.Router(); /* GET login page. */ router.get('/', function(req, res, next) { res.render('login'); }) router.post('/', function (req, res, next){ if (req.body.code === '***') { res.send({ status: 'OK', token: *** }); } else { res.send('KO'); } }) module.exports = router; 

Then:

 const loginRoute = require('./routes/login'); app.use('/', loginRoute);