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When building a Next.js application, you'll often find yourself deciding between using route handlers and server actions to manage your API endpoints. In this article, we'll explore the key differences between these two approaches and provide guidance on when to use each.
Route Handlers: The Default Choice
Route handlers are the most straightforward way to handle requests in Next.js. They're functions that export from a file within the pages/api directory, matching the route they're responsible for handling. Here's an example of a simple route handler:
// pages/api/hello.ts
export default async function handler(req: NextApiRequest, res: NextApiResponse) {
return res.status(200).json({ message: 'Hello World!' });
}This code defines a route handler for the /api/hello endpoint. When a GET request is made to this endpoint, it returns a JSON response with a "Hello World!" message.
Server Actions: A More Flexible Approach
Server actions, on the other hand, are a more powerful way to handle requests in Next.js. They're functions that export from a file within the pages/api directory and return an object with two properties: GET, POST, etc. This allows you to define multiple methods for a single endpoint.
Here's an example of a server action:
// pages/api/hello.ts
export default async function handler(req: NextApiRequest, res: NextApiResponse) {
switch (req.method) {
case 'GET':
return res.status(200).json({ message: 'Hello World!' });
case 'POST':
const data = await req.json();
// Process the request data...
return res.status(201).json({ message: 'Data processed successfully' });
}
}In this example, we're using a server action to handle both GET and POST requests. The switch statement checks the request method and returns an appropriate response.
When to Use Each
So when should you use route handlers versus server actions? Here are some general guidelines:
Route Handlers
- Use route handlers for simple, single-method endpoints.
- When you need to handle a small number of requests with a straightforward logic.
- For public-facing APIs where you want to expose specific data or functionality.
Example: Exposing a list of users to the public API.
// pages/api/users.ts
export default async function handler(req: NextApiRequest, res: NextApiResponse) {
const users = await prisma.user.findMany();
return res.status(200).json(users);
}Server Actions
- Use server actions for more complex endpoints with multiple methods.
- When you need to handle a large number of requests with different logic for each method.
- For internal APIs where you want to encapsulate business logic or perform mutations.
Example: Handling user creation, deletion, and updates using a single server action:
// pages/api/users.ts
export default async function handler(req: NextApiRequest, res: NextApiResponse) {
switch (req.method) {
case 'POST':
const data = await req.json();
// Validate and process the request data...
return res.status(201).json({ message: 'User created successfully' });
case 'DELETE':
const userId = req.query.id;
// Process the deletion logic...
return res.status(204).json({ message: 'User deleted successfully' });
}
}When NOT to Use It
While server actions are powerful, there are cases where you might want to avoid using them:
- Overcomplication: Avoid using server actions for simple endpoints. This can lead to over-engineering and complexity.
- Performance: Server actions require more overhead compared to route handlers due to the need to check the request method.
Related Apiary Lessons
For a deeper understanding of Next.js routing, be sure to check out our articles on:
Bee-themed One-liner
"Just as a hive requires both busy bees and gentle queens, your Next.js application needs the simplicity of route handlers and the power of server actions to thrive."