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api-guidelines/core-principles/api-first.md
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API First

Everyone MUST follow the API First principle.

The API first principle is extension of contract-first principle. Therefore, an development of an API MUST always start with API design without any upfront coding activities.

API description is the master of truth, not the API implementation.

API implementation MUST always be compliant to respective API description which represent the contract between API and it's consumer.