Both log and auth Middleware are not functioning as expected. Running the program using log produces a TypeError: app.use() requires a middleware function. Running the program with auth produces neither an error or the expected result. Without the custom created Middleware the program runs as expected.
Thank you for advice.
index.js:
const morgan = require(‘morgan’);
const helmet = require(‘helmet’);
const Joi = require(‘joi’);
const log = require(’./logger’);
const aut = require(’./auth’);
const express = require(‘express’);
const app = express();
app.use(express.json());
app.use(helmet());
app.use(morgan(‘tiny’));
app.use(log); // Deleting this line removes an error message.
app.use(aut); // This line doesn’t produce anything.
const courses = [
{ id: 1, name: ‘course1’ },
{ id: 2, name: ‘course2’ },
{ id: 3, name: ‘course3’ },
];
app.get(’/’, (req, res) => {
res.send(‘Hello World’);
});
app.get(’/api/courses’, (req, res) => {
res.send(courses);
});
app.post(’/api/courses’, (req, res) => {
const { error } = validateCourse(req.body);
if (error) return res.status(400).send(error.details[0].message);
const course = {
id: courses.length + 1,
name: req.body.name
};
courses.push(course);
res.send(course);
});
app.put(’/api/courses/:id’, (req, res) => {
const course = courses.find(c => c.id === parseInt(req.params.id));
if (!course) res.status(404).send('The course with the given ID was not found.')
const { error } = validateCourse(req.body);
if (error) {
res.status(400).send(error.details[0].message);
return;
}
course.name = req.body.name;
res.send(course);
});
function validateCourse(course) {
const schema = Joi.object ({
name: Joi.string().min(3).required()
});
return schema.validate(course);
}
app.get(’/api/courses/:id’, (req, res) => {
const course = courses.find(c => c.id === parseInt(req.params.id));
if (!course) res.status(404).send(‘The course with the given ID was not found.’)
res.send(course);
});
const port = process.env.PORT || 3000;
app.listen(port, () => console.log(Listening on port ${port}...));
app.delete(’/api/courses/:id’, (req, res) => {
const course = courses.find(c => c.id === parseInt(req.params.id));
if (!course) res.status(404).send('The course with the given ID was not found.')
const index = courses.indexOf(course);
courses.splice(index, 1);
res.send(course);
});
logger.js:
function log(req, res, next) {
console.log(‘Logging…’);
next();
}
module.exports = log;
auth.js:
function auth(req, res, next) {
console.log(‘Authenticating…’);
next();
}
module.exports = auth;