使用函数对象的Node.js自定义中间件

Question

In Express.js, ihave been having problems with making my own middleware. I know that middleware is supposed to be a function, but can the middleware function be inside an array. For Example:

module.js:

module.exports = {
  function1: function(req, res) {
    console.log('function1'); 
    //second edit.
    I want to return something as well
    return 'hello world';
    //if i add next(); it wont call the next();
  },
  function2: function(req, res) {
     console.log('function2');
  }
}

app.js:

const express = require('express')
, middleware = require('./module')
, app = express();

app.use(middleware.function1);
app.use(middleware.function2);

app.get('/', (req, res) => {
  //this is an edit: i want to use some code here like
  res.send('Hello World');
  middleware.function1();
});

app.listen(8080);

When i Do This, the webpage just doesn't load. Any Help?

Answer 1

You are missing crucial part next function (which is callback to trigger next middleware in the sequence) in defining middleware functions function1 and function2.

Have you seen https://expressjs.com/en/guide/writing-middleware.html ?

In below code, you are not passing req, res to the middleware function.

app.get('/', (req, res) => {
  middleware.function1();
});

OR call it directly as below

app.get('/', middleware.function1);