- backend developers
- teams integrating systems
- businesses reducing manual rework
Contracts and integration
REST APIs and integrations
This hub treats APIs as contracts between systems, not only endpoints. It focuses on response shape, validation, status codes, authentication, pagination, observability and the practical cost of breaking consumers.
- Which contract details must be stable before another system depends on the API.
- How errors, validation and status codes should guide frontend and mobile apps.
- Which logs and correlation IDs reduce support time during integration failures.
- When a REST API needs refactoring before it becomes harder to evolve.
Reading path
Start with the strongest context already available in the portal.
Some deeper references still point to Portuguese source articles while the full English migration continues. The English hub itself gives the decision map and the language relationship stays explicit.
API contracts for React Native apps
English article about contracts between Spring Boot APIs and mobile apps.
Open referenceREST API validation and error practices
Portuguese guide about predictable API validation and errors.
Open referenceRequest correlation logs in Spring Boot
Portuguese article about evidence for API support.
Open referenceHow to use this hub
Treat this page as a decision map. The purpose is to help you name the problem before choosing a framework, vendor, refactor or automation. When the topic is clearer, the linked material becomes easier to interpret and compare.
The English migration is intentionally additive: the Portuguese portal remains stable, and each English page receives its own route, canonical URL and language alternates.
Terms to align before going deeper
FAQ
Common questions before acting on rest apis and integrations.
What is the minimum API contract for another client?
It should define endpoints, payloads, status codes, validation errors, authentication behavior, pagination and the signals needed for support.
Why do API errors matter to user experience?
Users do not see HTTP semantics. They see messages, retry buttons, blocked screens and failed submissions. Error design decides whether the interface can guide them.
When should an API be refactored?
Refactoring becomes important when responses are inconsistent, internal entities leak, rules are duplicated or each new consumer needs exceptions.
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