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Fastify validates request payloads against JSON Schema after body parsing and before handler execution. When a field is missing or fails type coercion, the framework returns a 400 response containing structured Ajv validation errors. In production environments, these default error payloads can reveal internal schema keywords and data structure, creating a po
Fastify–Ajv Integration: Strict Mode Interaction with Custom Serializers When a Fastify route defines a JSON schema, enabling the strict: true option instructs the underlying Ajv validator to reject schemas that contain unknown keywords or invalid constructs, preventing silent misconfiguration. At the same time, developers may attach a custom serializer via
When developing a Moleculer service locally, setting validator: false (or omitting the flag) lets the broker skip AJV schema validation for action parameters, so invalid requests are accepted without error. The same configuration deployed to production allows unvalidated payloads to reach service actions, which can cause unexpected behavior, security risks,
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