API-first web development
Agreeing the API first lets your website, app and partner systems draw on the same data.
Background
API-first means the interface is agreed before work on the front end or back end begins. It pays off once more than one channel needs the same data. A website, mobile app, customer portal and partner systems then share a single source. New channels can be connected without rebuilding the back end.
The starting point is an interface contract covering endpoints, data structures and error cases. Because the contract is fixed, front-end and back-end teams can work in parallel.
In a conventional project, the interface grows out of whatever the first application happened to need. Each new channel then brings one-off workarounds and extra coordination.
Benefits for decision-makers
Faster time to market, because teams develop in parallel
Lower risk in a redesign, because front ends can be swapped out
Clear responsibilities between in-house teams and external suppliers
No duplicate maintenance of the same data across several systems
Partners and suppliers can connect using the documentation
Automated tests against the contract catch breaking changes early
Technology
We describe interfaces in OpenAPI and usually implement them as a REST API in Laravel. Where clients need very different slices of data, GraphQL is an option. Authentication uses OAuth 2.0 or Laravel Sanctum. Readable documentation and test cases are generated automatically from the OpenAPI description.
Approach
Clarify use cases and data flows with business teams and IT
Draft the API contract in OpenAPI and agree it together
Provide a mock server so front-end teams can start straight away
Implement the API with automated contract tests
Document, version and monitor the API once it is live
Security and stability
Every request is authenticated, authorised and validated. Rate limiting protects against overload and misuse. Responses contain only the fields each client needs.
Changes to the contract are released as a new version, so existing clients keep working. Old versions are retired with plenty of notice. Partners get a sandbox with test data, which shortens the time it takes to connect them.