What are the main criteria to consider when developing a RESTful interface?

Main criteria for developing a RESTful interface:

• Use of correct HTTP methods: GET for retrieving data, POST for creating, PUT/PATCH for updating, DELETE for deleting.
• Resource identification via URI: each resource should have a unique and understandable URL.
• Standardization of data format: usually JSON, with a clear structure and description.
• HTTP response statuses: proper use of status codes (200, 201, 400, 404, 500, etc.) to inform the client about the request result.
• API versioning support: to avoid breaking clients when making changes.
• Security: authentication and authorization (e.g., OAuth, JWT).
• API documentation: using Swagger/OpenAPI for ease of use.

Example of a simple RESTful URL:

GET /api/v1/users/123

Request to get user with ID 123.