JSON Schema Validation with Spring Boot

This project demonstrates how to validate incoming JSON payloads in a Spring Boot REST API using JSON Schema.
It ensures that client requests follow a strict contract (correct fields, types, lengths, etc.) before processing.

Maven Dependency to added:-

	<dependency>
		<groupId>com.networknt</groupId>
		<artifactId>json-schema-validator</artifactId>
		<version>1.5.9</version>
	</dependency>
</dependencies>

Project Structure:-

src/
└── main/
├── java/com/example/demo
│ ├── PayloadController.java
│ ├── JsonValidationService.java
│ └── DemoApplication.java
└── resources/
├── application.properties
├── schema.json
└── samples/
├── valid-payload.json
└── invalid-payload.json

There is a schema.json , file which defines rules for validations for incoming payloads , if payloads fails to validate then it returns the shortcomings in payload

To test use this uri :- http://localhost:8080/api/validate with method POST and in json body provide below payloads

Valid payload

{
"name": "John Doe",
"age": 28,
"email": "john.doe@example.com",
"address": {
    "street": "221B Baker Street",
    "city": "London"
}
}

and invalid payload:-

{
"name": "John Doe",
"age": 28,
"email": "john.doe@example.com"
}

for invalid we should see this return

    [ { "type": "type",
    "code": "1029",
    "message": "$.address: string   found, object expected",
    "instanceLocation": "$.address",  
        "evaluationPath": "$.properties.address.type", 
        "schemaLocation":    "#/properties/address/type", 
        "messageKey": "type", "arguments": [  "string", "object"  ] } ]