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When Fastify rejects a request or mis‑serializes a response, the issue often lies in a schema mismatch. This guide walks through the recognizable error patterns, diagnostic steps, and fixes to help engineers quickly pinpoint and resolve Fastify schema validation and serialization problems.
Fix unresolved OpenAPI 3.0 $ref references by checking target files, base URIs, document version, and schema cycles.
XML Schema validation is the first line of defense against malformed data. This post walks through why, when, and how to validate XML against an XSD, shows a concrete example in Java, discusses performance trade‑offs, and gives clear next‑steps for production use.
XML namespaces eliminate element name collisions and enable accurate schema validation. This guide explains core concepts, shows a Java parsing example, discusses trade‑offs, and provides actionable steps for real‑world XML engineering.
SurrealDB upserts match only on the record ID, and type checks only exist once you define fields. Here's how UPSERT, DEFINE FIELD, and SCHEMAFULL interact — and how to verify the behavior on your own deployment.
Model mutually exclusive API payloads with OpenAPI oneOf, anyOf, and discriminators — with a working payment schema, validation checks, and honest tooling trade-offs.
How to model polymorphic request and response bodies in OpenAPI 3.x using oneOf with a discriminator: a worked Pet/Cat/Dog schema, why the mapping table and required property matter, and the pitfalls that break validators and generators.
Learn how to use Discloud's manifest‑based validation phase to prevent deployment failures by enforcing resource schema compatibility before allocation.
Mongoose query casting can silently remove filter keys that do not exist on the schema. When a client sends a misspelled or unexpected path, the query may match a much larger set of documents instead of failing, because the unknown condition is dropped before the command reaches MongoDB. The strictQuery option governs this behavior and was split from strict
fastify
openapi
java
xml
surrealdb
mongoose