JSON Schema Validation

<dependency>
    <groupId>com.networknt</groupId>
    <artifactId>json-schema-validator</artifactId>
    <version>1.0.42</version>
</dependency>

private static InputStream inputStreamFromClasspath(String path) {
    return Thread.currentThread().getContextClassLoader().getResourceAsStream(path);
}
 
public static void main(String[] args) throws Exception {
    ObjectMapper objectMapper = new ObjectMapper();
    JsonSchemaFactory schemaFactory = JsonSchemaFactory.getInstance(SpecVersion.VersionFlag.V201909);
 
    try (
            InputStream jsonStream = inputStreamFromClasspath("example.json");
            InputStream schemaStream = inputStreamFromClasspath("example-schema.json")
    ) {
        JsonNode json = objectMapper.readTree(jsonStream);
        JsonSchema schema = schemaFactory.getSchema(schemaStream);
        Set<ValidationMessage> validationResult = schema.validate(json);
 
        // print validation errors
        if (validationResult.isEmpty()) {
            System.out.println("no validation errors :-)");
        } else {
            validationResult.forEach(vm -> System.out.println(vm.getMessage()));
        }
    }
}

References

Jackson Serialize/Deserialize for Java 8 java.time NetworkNT JSON Schema With Unknown keywords NetworkNT fastest Java JSON Schema Validator Introduction to JSON Schema in Java Ajv: Another JSON schema validator JSON Schema validation in Java JSON Schema Implementations EverIt JSON Schema Validator Structuring a Complex Schema jackson-modules-java8