RESTful API Principles

A RESTful API is an API designed around resources and standard HTTP methods. In Express.js applications, REST principles help create predictable and organized endpoints that are easy to understand and maintain.

A resource represents a piece of data in the application, such as users, products, or orders.

Example resource:

/users

REST APIs use different HTTP methods to perform operations on resources.

Example RESTful Routes

Example:

app.get('/users', (req, res) => {
  res.send('Get all users');
});

app.post('/users', (req, res) => {
  res.send('Create a user');
});

app.put('/users/:id', (req, res) => {
  res.send('Update a user');
});

app.delete('/users/:id', (req, res) => {
  res.send('Delete a user');
});

Each route performs a different operation on the same resource.

REST API Best Practices

RESTful APIs usually follow several common principles:

• Use nouns for resources instead of verbs;
• Keep endpoints consistent and predictable;
• Use proper HTTP methods for each operation;
• Return meaningful status codes and responses.

For example:

• /users is better than /getUsers;
• /products/5 clearly targets a specific product.

These conventions make APIs easier for developers to use and understand.