Express Validator Concepts and Usage

The video tutorial explains how to use Express Validator to ensure data integrity in Express APIs. It emphasizes the importance of server-side validation, even when client-side validation is in place, due to potential bypasses. The tutorial covers installing Express Validator, using middleware functions for validating query parameters and request bodies, and handling validation errors. It also introduces using schemas for cleaner code and demonstrates practical examples of implementing these validations.

Why is server-side validation important even if client-side validation is implemented?

• Server-side validation is faster.

• Client-side validation is not reliable.

• Server-side validation is easier to implement.

• Client-side validation can be bypassed.

What command is used to install Express Validator?

• npm install validator-express

• npm install validate-express

• npm install express-validator

• npm install express-validate

Which function is used to validate query parameters in Express Validator?

• validateQuery

• checkQuery

• query

• validateParams

What does the 'isString' method in a validation chain check for?

• If the value is an array

• If the value is a string

• If the value is a number

• If the value is an object

How do you handle validation errors in Express Validator?

• Errors are logged but not handled

• Manually handle errors in the request handler

• Use the 'handleErrors' function

• Errors are automatically handled by Express Validator

Which function is used to validate request bodies in Express Validator?

• validateBody

• checkBody

• validateRequest

• body

What does the 'notEmpty' method in a validation chain ensure?

• The value is not zero

• The value is not undefined

• The value is not an empty string

• The value is not null

How can you validate multiple fields in a request body using Express Validator?

• Use the 'checkFields' function

• Use an array of 'body' function calls

• Use the 'validateFields' function

• Use multiple 'body' function calls

What is the purpose of the 'matchedData' function in Express Validator?

• To match data with a database

• To match data with a schema

• To retrieve all request data

• To retrieve validated data

What is the benefit of using schemas in Express Validator?

• Schemas make the code run faster

• Schemas are required for validation

• Schemas make the code look cleaner and more readable

• Schemas are easier to write