<aside> 📚 📁 Category: Backend Development

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What is REST?

REST (Representational State Transfer) is an architectural style for designing networked applications. It relies on a stateless, client-server protocol, almost always HTTP.

<aside> ℹ️ REST is not a protocol or standard, but rather a set of architectural constraints. RESTful systems are stateless, cacheable, and have a uniform interface.

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HTTP Methods

URL Design Principles

GET  /getUsers
POST /createUser
POST /deleteUser/123

GET    /users
POST   /users
DELETE /users/123

GET /user/123
GET /product/456

GET /users/123
GET /products/456

GET /users/123/orders           # Get all orders for user 123
GET /users/123/orders/456       # Get order 456 for user 123
GET /categories/5/products      # Get all products in category 5

HTTP Status Codes

• 200 OK - Standard success response
• 201 Created - Resource successfully created
• 204 No Content - Success but no content to return
• 400 Bad Request - Invalid request syntax
• 401 Unauthorized - Authentication required
• 403 Forbidden - Authenticated but not authorized
• 404 Not Found - Resource not found
• 422 Unprocessable Entity - Validation errors