1. Define API requirements: Identify resources, entities, relationships, and operations.
2. Choose API style: Select REST or GraphQL based on project needs.
3. Design API endpoints: Define URLs, HTTP methods, and request/response formats.
4. Implement error handling: Create a consistent error response format.
5. Implement pagination: Add pagination to list endpoints.
6. Implement authentication: Choose and implement an authentication method.
7. Document the API: Create an OpenAPI specification.
8. Apply best practices: Ensure consistency, security, and validation.