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An architecture note on using Clojure's core.spec to validate data at service boundaries, instrument functions in CI, and generate tests — with the smallest design that works and the failure modes to watch.
When XML schema validation fails in Java applications, error codes like cvc-elt.1 or cvc-complex-type.2.4.a reveal specific issues. This guide provides a diagnostic table, ordered checks, and remediation steps for JAXB and Xerces.
When building REST APIs with NestJS, developers often place validation logic directly inside each controller method. This leads to duplicated code, inconsistent error messages, and makes it hard to evolve business rules.
Fastify's declarative JSON Schema validation eliminates per-route validation boilerplate, produces consistent error responses, and compiles to fast runtime checks. A worked example shows the pattern, plus trade-offs for dynamic rules and large schemas.
FeathersJS hooks provide transport-agnostic, composable middleware for service methods. This guide shows a worked validation-hashing-sanitization chain, explains execution order, and covers common mistakes like missing returns and unhandled promises.
PowerShell classes replace error‑prone hashtables with typed, validated objects that support methods and inheritance. A migration example shows validation at assignment, static factories, and version trade‑offs.
Guide comparing JSON Schema validation with custom POJO validation in Java REST APIs, showing constraints, trade‑offs, a Maven‑based implementation, and verification steps.
Fastify validates requests at the C++ parser level using JSON Schema draft-06, rejecting bad payloads before handlers run. Encapsulation scopes prevent schema ID collisions across plugins. A worked example shows validation, serialization, and verification steps.
NET 8 doesn't include a built-in DataAnnotations source generator. This post shows how to write a minimal generator that emits a fast Validate method for your DTOs, moving validation from runtime reflection to compile-time code generation.
clojure
java
nestjs
fastify
nodejs
feathersjs
powershell
json
dotnet