Recall & Review
beginner
What is request validation in Node.js?
Request validation is the process of checking incoming data from users or clients to make sure it is correct, safe, and complete before using it in your application.
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beginner
Why is request validation important?
It helps prevent errors, security problems like injection attacks, and ensures your app works as expected by only accepting valid data.
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beginner
Name a popular Node.js library used for request validation.
Joi is a popular library that helps define rules for data and check if incoming requests follow those rules.
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intermediate
How does middleware help with request validation in Express.js?
Middleware runs before your main code and can check the request data. If data is invalid, it can stop the request and send an error response.
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intermediate
What is a common pattern to handle validation errors in Node.js apps?
After validating data, if errors exist, return a response with status 400 and a message explaining what is wrong, so the client can fix it.
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What does request validation check in Node.js apps?
✗ Incorrect
Request validation checks if the data sent by users is correct and safe before using it.
Which Node.js library is commonly used for schema-based validation?
✗ Incorrect
Joi helps define and check data rules for validation.
In Express.js, where is validation logic usually placed?
✗ Incorrect
Middleware runs before route handlers and is ideal for validation.
What HTTP status code is commonly returned when validation fails?
✗ Incorrect
Status 400 means bad request, used when input data is invalid.
What should you do if request data is invalid?
✗ Incorrect
Sending an error response helps the client fix the data.
Explain how you would add request validation to an Express.js route using middleware.
Think about how middleware runs before your route handler.
You got /4 concepts.
Describe why request validation improves security and reliability in Node.js applications.
Consider what could happen if invalid data is used unchecked.
You got /4 concepts.