API Specification Template

API Specification Template: a polished, practical template for product, technical & operations work.

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A clean, editable document structure ready for your details.

API Specification

Owner: [Owner]
Status: [Draft/In review/Approved]
Version: [Version]
Target release: [Date or milestone]

Problem or decision: [Problem, decision, or outcome governed by this specification]
Reviewers: [Roles responsible for technical, product, security, and operational review]


1. Overview and version

[Method and path]


2. Authentication

[Auth scope and tenant context]


3. Resources and endpoints

[Parameter schema and validation]


4. Request schemas

[Success response and headers]


5. Response schemas

[Error code and retryability]


6. Errors

[Idempotency and versioning rule]


7. Pagination and filtering

[Pagination and filtering: record the behavior, data, constraints, edge cases, ownership, and acceptance evidence that apply to this API Specification]


8. Rate limits

[Rate limits: record the behavior, data, constraints, edge cases, ownership, and acceptance evidence that apply to this API Specification]


9. Compatibility and examples

[Compatibility and examples: record the behavior, data, constraints, edge cases, ownership, and acceptance evidence that apply to this API Specification]


Review and Change Control

[Reviewers, decision owner, unresolved questions, linked evidence, approval date, and change history]