JSON Schema validation in Postman - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is JSON Schema validation?

JSON Schema validation is a way to check if a JSON response matches a defined structure and rules. It ensures the data format is correct.

beginner

How do you use JSON Schema validation in Postman tests?

In Postman, you write a test script that uses the 'pm.expect' function with 'tv4.validate' or 'ajv.validate' to check the response against a JSON schema.

beginner

What is the role of 'required' in a JSON Schema?

The 'required' keyword lists properties that must be present in the JSON data for the validation to pass.

beginner

Why is JSON Schema validation useful in API testing?

It helps catch errors early by verifying the API response structure, making sure the data is complete and correctly formatted.

beginner

What happens if JSON Schema validation fails in a Postman test?

The test will fail, showing an error message that the response does not match the expected schema.

Which keyword in JSON Schema specifies properties that must be present?

A required

B properties

C type

D items

The 'required' keyword lists the properties that must exist in the JSON data.

In Postman, which function is commonly used to assert JSON Schema validation?

A pm.sendRequest()

B console.log()

C pm.expect()

D pm.response.to()

pm.expect() is used to write assertions, including JSON Schema validation.

What does JSON Schema validation check in API responses?

A Server status

B Response structure and data types

C Response time

D Network latency

JSON Schema validation checks if the response structure and data types match the schema.

If a JSON Schema validation fails, what is the usual outcome in Postman?

A Response is ignored

B Test passes silently

C Postman crashes

D Test fails with an error

A failed validation causes the test to fail and shows an error message.

Which of these is NOT a valid JSON Schema data type?

A function

B integer

C boolean

D string

'function' is not a valid JSON Schema data type.

Explain how JSON Schema validation helps improve API testing in Postman.

Think about how validating the shape and content of data helps avoid bugs.

Describe the steps to add JSON Schema validation in a Postman test script.

Focus on writing the schema and using Postman test functions.