POST route handling in Express - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of a POST route in Express?

A POST route in Express is used to handle requests where the client sends data to the server, often to create or update resources.

beginner

How do you define a POST route in Express?

Use app.post('/path', (req, res) => { ... }) where '/path' is the route URL and the callback handles the request and response.

intermediate

Why do we use middleware like express.json() with POST routes?

express.json() middleware parses incoming JSON data in the request body so you can access it easily via req.body.

beginner

What does req.body represent in a POST route handler?

req.body contains the data sent by the client in the body of the POST request, usually parsed by middleware like express.json().

beginner

How can you send a response back to the client in a POST route?

Use res.send(), res.json(), or res.status() methods to send data or status codes back to the client after processing the POST request.

Which Express method is used to handle POST requests?

A app.put()

B app.get()

C app.post()

D app.delete()

app.post() is specifically designed to handle POST requests where data is sent to the server.

What middleware is commonly used to parse JSON data in POST requests?

A express.json()

B express.static()

C body-parser.text()

D express.urlencoded()

express.json() parses incoming JSON payloads so req.body contains the parsed data.

In a POST route, where do you find the data sent by the client?

A req.params

B req.body

C req.query

D req.headers

req.body holds the data sent in the body of a POST request.

How do you send a JSON response back to the client in Express?

A res.write()

B res.sendJson()

C res.send()

D res.json()

res.json() sends a JSON-formatted response to the client.

What is the correct way to define a POST route for '/submit' in Express?

A app.post('/submit', handler)

B app.put('/submit', handler)

C app.get('/submit', handler)

D app.delete('/submit', handler)

app.post('/submit', handler) defines a POST route at '/submit'.

Explain how to create a POST route in Express that receives JSON data and sends a confirmation response.

Think about how the server reads data and replies.

Describe why middleware like express.json() is important for POST route handling in Express.

Middleware helps prepare the data for your route.