A practical guide to API contracts, authentication, validation, errors, retries, caching, testing and observability in full-stack applications.
API integration connects interfaces, backend services and external systems. Reliable integration requires a clear contract and deliberate handling of failure, security and data quality.
Never expose private service credentials in browser code or trust external responses without validation.
Keep private credentials on the server. Validate incoming and outgoing data, enforce authorisation and limit what is returned to the client. Use timeouts for external calls.
Test successful requests, invalid data, permission failures, timeouts, rate limits and unavailable dependencies. Monitor latency, errors and dependency health after release.
Good API integration treats remote systems as fallible. Validate contracts, protect credentials, handle errors and monitor real behaviour.
Use provider documentation and test environments before connecting production data or payments.
FAQs
Private credentials should not be exposed in browser or mobile bundles. Keep them in a protected server environment.
Retry only suitable transient failures, with limits and backoff, while considering whether the operation is idempotent.
Cover success, invalid data, permissions, timeouts, rate limits, dependency failure and duplicate requests.
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