Body validation before sending in Postman - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is body validation before sending in API testing?

It means checking the data you want to send in the request body to make sure it is correct and complete before actually sending it to the server.

beginner

Why is body validation important before sending a request?

It helps catch errors early, prevents sending bad data, and saves time by avoiding failed requests and debugging later.

intermediate

How can you validate the request body in Postman before sending?

You can use Pre-request Scripts in Postman to write JavaScript code that checks the body data and stops the request if the data is invalid.

beginner

Example: What happens if a required field is missing in the body during validation?

The validation script can show an error message and prevent the request from sending until the missing field is added.

intermediate

What is a simple way to stop a request in Postman if validation fails?

Use throw new Error('Validation failed') in the Pre-request Script to abort the current request before it runs.

What is the main purpose of body validation before sending a request?

A To check if the request body data is correct and complete

B To speed up the server response

C To change the server URL

D To encrypt the request body

Body validation ensures the data you send is correct and complete before sending the request.

Which Postman feature allows you to validate the request body before sending?

A Environment Variables

B Pre-request Script

C Tests tab

D Collection Runner

Pre-request Scripts run before the request and can validate the body data.

What happens if the validation script detects missing required data in the body?

A The request sends anyway without errors

B The server automatically fixes the data

C The request can be stopped from sending

D The request body is deleted

Validation scripts can stop the request to prevent sending bad data.

Which command in Postman stops the current request from running?

A throw new Error('message')

B pm.sendRequest()

C console.log()

D pm.test()

Throwing an Error in the Pre-request Script aborts the request before it is sent.

Body validation before sending helps to:

A Change the API endpoint

B Make the UI look better

C Increase server storage

D Prevent sending incorrect data

Validation prevents errors by ensuring data is correct before sending.

Explain how you would validate a JSON request body in Postman before sending it.

Think about writing JavaScript code that runs before the request.

Why is it better to validate the request body before sending rather than after receiving a server error?

Consider the benefits of preventing errors upfront.