How to Fix CORS Preflight Errors in Your API
Diagnose CORS preflight failures with explicit origins, credential rules, OPTIONS responses, and cache behavior while keeping authentication and authorization separate.
Chidi NwosuAuthorization Code Flow With PKCE: A Backend Guide
Implement OAuth authorization code flow with PKCE, state validation, secure code exchange, and server-side token handling without confusing OAuth with login.
Chidi NwosuAPI Versioning Best Practices: URLs, Headers, Evolution
Compare URL and header versioning, identify subtle breaking changes, and build a migration policy that lets API clients evolve without unexpected failures.
Chidi NwosuSession Cookies vs JWT: Choosing API Authentication
Compare server-side sessions and JWT access tokens for web APIs, including revocation, cookie security, token validation, and practical browser deployment trade-offs.
Chidi NwosuIdempotency Keys: Safe Retries for POST Requests
Prevent duplicate orders and payments with durable idempotency keys, request fingerprints, concurrency control, and clearly documented retry and retention rules.
Chidi NwosuVerify Webhook Signatures and Handle Duplicate Events
Build reliable webhook receivers with raw-body signature verification, replay checks, durable event storage, and idempotent processing that survives retries.
Chidi NwosuCursor Pagination in PostgreSQL: A REST API Guide
Build stable cursor pagination with PostgreSQL keyset queries, composite ordering, opaque tokens, and explicit behavior for filters, deleted rows, and new records.
Chidi NwosuServerless vs Edge Functions: Cold Starts and Limits
Choose between regional serverless functions, edge runtimes, and persistent services by measuring cold starts, database distance, execution limits, and failure behavior.
Chidi NwosuREST vs GraphQL vs tRPC: Choosing an API Style
Compare REST, GraphQL, and tRPC through client needs, caching, security, and deployment constraints, then validate your choice with a production-shaped prototype.
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