Error response formatting in Node.js - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to send a JSON error response with status 400.

Node.js

res.status(400).json({ error: [1] });

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

A"Invalid input"

B400

Ctrue

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Using a number instead of a string for the error message.

Sending null or true instead of a descriptive message.

Use a string message inside the error property to describe the error.

2fill in blank

medium

Complete the code to set the HTTP status to 404 before sending the error JSON.

Node.js

res.[1](404).json({ error: "Not found" });

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

Asend

Bjson

Cstatus

Dset

Attempts:

3 left

💡 Hint

Common Mistakes

Using send instead of status to set the status code.

Trying to set status with set which is for headers.

The status method sets the HTTP status code before sending the response.

3fill in blank

hard

Fix the error in the code to properly send a JSON error response with status 500.

Node.js

res.status(500).[1]({ message: "Server error" });

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

Asend

Bjson

Cwrite

Dend

Attempts:

3 left

💡 Hint

Common Mistakes

Using send which may not set the content type correctly.

Using write or end which are lower-level methods.

Use json to send a JSON response. send can send strings or buffers but json formats the object as JSON.

4fill in blank

hard

Fill both blanks to create a middleware that sends a 401 error with a JSON message.

Node.js

app.use((req, res) => { res.[1]([2]).json({ error: "Unauthorized" }); });

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

Astatus

Bsend

C401

D403

Attempts:

3 left

💡 Hint

Common Mistakes

Using send instead of status to set the status code.

Using 403 instead of 401 for unauthorized errors.

Use status to set the HTTP status code and 401 for unauthorized errors.

5fill in blank

hard

Fill all three blanks to send a 422 error with a JSON object containing code, message, and details.

Node.js

res.[1]([2]).json({ code: [3], message: "Invalid data", details: "Missing fields" });

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

Astatus

B422

Dsend

Attempts:

3 left

💡 Hint

Common Mistakes

Using send instead of status.

Using string '422' instead of number 422 for the code property.

Use status to set the HTTP status code to 422. The code property in JSON should also be 422 as a number.