The JSON Schema validator evaluates JSON payloads at runtime by matching them against a referenced JSON schema located either locally or via external URI. If the payload does not comply with the schema, a JsonSchemaValidationException will be raised. Using the validator involves adding a <json:validate-schema> element that references the schema file location. Successful payloads will pass through while non-compliant payloads will trigger the exception.

1. Ankit Lawaniya

2.  The JSON Schema validator evaluates JSON payloads at runtime
and verifies that they match a referenced JSON schema. We can
match against schemas that exist in a local file or in an external
URI.
 If the payload is not compliant with JSON schema then we will get
the below Exception:
org.mule.module.json.validation.JsonSchemaValidationException: Json
content is not compliant with schema

3. This feature is specially useful when we are consuming a service that
expects JSON inputs and that must match a specific schema. Only the
JSON payload which is successfully validated against schema will pass
through otherwise JSON schema validation exception will be raised.
Syntax:
<json:validate-schema schemaLocation="EmployeeSchema.json"
doc:name="Validate Json Schema" />

4. Let’s walk through how to use JSON Schema validator in Mule
application.
Using the JSON Schema Validator is very simple: We only need to
provide a reference to the schema file you want to validate against on
schemaLocation. The Schema Validator accepts both local and external
resources.In this example we have "EmployeeSchema.json" located in
src/main/resources folder . We are expecting the JSON payload as part
of the request which will be validated aganist the schema.

7. Success Request:
{
"firstName": "Ankit",
"lastName": "Lawaniya",
"age": 28
}

8. Failed Request:
{
"firstName": "Ankit",
"age": 28
}