Sunday, 27 March 2022

What is Json Schema and how to perform schema validation using Rest Assured?

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Table Of Contents:

What is Schema?

Why JSON Schema Validation is required?

How to automate schema validation with Rest Assured?

COMMON ERROR found in schema validations

How to perform manual schema validation

What is Schema?

Schema is nothing but a JSON file. It will only have datatype information and the expected keys of the JSON. There won't be any values present in the schema.

Schema is an important concept to learn. JSON Schema is a JSON media type for defining the structure of JSON data. JSON Schema provides a contract for what JSON data is required for a given application and how to interact with it. JSON Schema is intended to define validation, documentation, hyperlink navigation, and interaction control of JSON data.

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Why JSON Schema Validation is required?

JSON Schema Validation is required to monitor API responses and ensure that the format that we are getting is the same as the expected one.

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How to automate schema validation

Step-1: Add below dependency:

Step-2: Load expected schema

Load the expected "schema.JSON" in a file object.
You can create a schema from json using below website:

https://www.liquid-technologies.com/online-json-to-schema-converter

Step:3. Validate using matchesJsonSchema

Validate the response body using the matchesJsonSchema method.

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COMMON ERROR found in schema validations are:

Error:(common errors in your current project)

object has missing required properties

instance type (integer) does not match any allowed primitive type (allowed: ["string"])

How to perform manual schema validation

TO COMPARE SCHEMA MANUALLY use below website:

http://www.jsondiff.com/

In the above we can paste both the schemas and do a comparison


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