Slim Middleware

When to use

• The user wants to add PSR-15 middleware to a Slim app or a specific route or group.
• The user needs Slim middleware that runs logic before and after the handler around $handler->handle().
• The user is reasoning about the execution order of stacked Slim middleware and the onion model.

When NOT to use

• Do not run long-running or background work inside middleware on the request path.
• Do not build middleware for logic that concerns only a single route and is not cross-cutting.

Core guidance