res.json for JSON responses in Express - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to send a JSON response with Express.

Express

app.get('/data', (req, res) => {
  res.[1]({ message: 'Hello World' });
});

Drag options to blanks, or click blank then click option'

Ajson

Bwrite

Crender

Dsend

Attempts:

3 left

💡 Hint

Common Mistakes

Using res.send() which can send JSON but does not explicitly set the content type.

Using res.render() which is for templates, not JSON.

Using res.write() which is a lower-level method.

Use res.json() to send a JSON response in Express.

2fill in blank

medium

Complete the code to send a JSON object with a status code 200.

Express

app.get('/status', (req, res) => {
  res.status(200).[1]({ success: true });
});

Drag options to blanks, or click blank then click option'

Asend

Bwrite

Cend

Djson

Attempts:

3 left

💡 Hint

Common Mistakes

Using res.send() which may not set the content type explicitly.

Using res.end() which ends the response without sending JSON.

Using res.write() which is not typical for JSON responses.

res.json() sends the JSON response after setting the status code.

3fill in blank

hard

Fix the error in sending a JSON response with an object.

Express

app.get('/user', (req, res) => {
  res.json({ name: 'Alice', age: [1] });
});

Drag options to blanks, or click blank then click option'

A'25'

B"25"

C25

Dage

Attempts:

3 left

💡 Hint

Common Mistakes

Putting numbers inside quotes, making them strings.

Using a variable name instead of a value.

Using single or double quotes around numbers.

Age should be a number, not a string, for proper JSON data types.

4fill in blank

hard

Fill both blanks to send a JSON response with a custom status and message.

Express

app.get('/error', (req, res) => {
  res.[1]([2]).json({ error: 'Not found' });
});

Drag options to blanks, or click blank then click option'

Astatus

BsendStatus

C404

D200

Attempts:

3 left

💡 Hint

Common Mistakes

Using sendStatus which ends the response immediately.

Using wrong status code like 200 for errors.

Not chaining status before json.

Use res.status(404) to set status before sending JSON error message.

5fill in blank

hard

Fill all three blanks to send a JSON response with a nested object and status code.

Express

app.get('/profile', (req, res) => {
  res.[1]([2]).json({ user: { name: 'Bob', age: [3] } });
});

Drag options to blanks, or click blank then click option'

Astatus

B200

C30

Dsend

Attempts:

3 left

💡 Hint

Common Mistakes

Using res.send instead of res.status for status code.

Putting age in quotes making it a string.

Not chaining status before json.

Use res.status(200) to set status and send JSON with age as number.