Summary
Defines how to set up GET endpoints that return collections or individual items using route parameters and respond with JSON without modifying any data.

General domain of usage
Web APIs


GET endpoints are used to retrieve data from the server.

They return data without changing anything.

```javascript id="p7d2xm"
const users = [
  { id: 1, name: 'John' },
  { id: 2, name: 'Anna' }
];

app.get('/users', (req, res) => {
  res.json(users);
});
```

This endpoint returns all users.

You can also return a single item using a route parameter:

```javascript id="c9v1ak"
app.get('/users/:id', (req, res) => {
  const id = Number(req.params.id);

  const user = users.find(u => u.id === id);

  res.json(user);
});
```

Examples:

* `'/users'`: returns all users;
* `'/users/1'`: returns user with id 1.

GET endpoints are the most common way to read data in an API.


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Building GET Endpoints for API