clojure-guardrails

You can enforce runtime validation for Clojure functions by using the Guardrails library with Malli schemas, applying `>defn` and `>fdef` macros to specify input and output types. This automatically catches type mismatches and constraint violations during execution.

Specifying complex function signatures in Clojure is done using Gspec syntax with Guardrails macros like `>defn` and `>def`. This allows you to define detailed input and output constraints, ensuring data integrity across complex API endpoints.

Yes, Guardrails can validate API contracts in Clojure by enforcing runtime checks on function inputs and outputs. You can specify that an email matches a regex pattern or a function returns a user record, catching unexpected return values before production.

Clojure Guardrails provides the macro system like `>defn` for defining function specifications, while Malli supplies the actual schema definitions for data validation. Together, they offer a combined system for precise runtime checks and data integrity enforcement.

You need runtime checks and function specs in Clojure when defining complex API endpoints or enforcing data integrity constraints. Using Guardrails with Malli schemas ensures that inputs like UUIDs and regex patterns are validated before the function executes.

You should use `>defn` instead of `defn` when you need to enforce runtime validation alongside function definition. It integrates Malli schemas directly into the function signature, automatically checking input and output types against your specifications.