Advanced REST API Development with Express

Topic Outline (30-min)

1. Dynamic Routes:

   • Using Route Parameters:

     • Define routes with dynamic placeholders.

     • Example:

       javascript코드 복사app.get('/users/:id', (req, res) => {
           res.send(`User ID: ${req.params.id}`);
       });

   • Handling Multiple Parameters:

     • Example:

       javascript코드 복사app.get('/users/:userId/posts/:postId', (req, res) => {
           const { userId, postId } = req.params;
           res.send(`User ID: ${userId}, Post ID: ${postId}`);
       });

2. Working with JSON:

   • Parsing JSON Request Bodies:

     • Use Express’s json() middleware:

       javascript코드 복사app.use(express.json());
       app.post('/data', (req, res) => {
           console.log(req.body);
           res.send('Data received');
       });

   • Sending JSON Responses:

     • Send structured JSON responses:

       javascript코드 복사app.get('/info', (req, res) => {
           res.json({ message: 'This is JSON data', timestamp: Date.now() });
       });

3. Error Handling:

   • Middleware for Error Handling:

     • Define a centralized error-handling middleware:

       javascript코드 복사app.use((err, req, res, next) => {
           console.error(err.stack);
           res.status(500).send('Internal Server Error');
       });

   • Catching and Responding to Invalid Routes:

     • Handle 404 errors:

       javascript코드 복사app.use((req, res) => {
           res.status(404).send('Route not found');
       });