How to Access HTTP Request Data in Laravel Controllers

Laravel makes the current Illuminate\Http\Request instance available through dependency injection; you can type‑hint Request $request in a controller constructor or method and the service container will provide the request object.

When you also need route parameters, place them after the Request argument, e.g. public function update(Request $request, $id) , and Laravel will inject both the request and the route variable.

A route closure can receive the request directly: Route::get('/', function (Request $request) { ... }); , allowing you to access the request without a controller class.

To obtain the full URL or just the path, use $request->url() (no query string) or $request->fullUrl() (includes query string). The HTTP method is available via $request->method() .

Input data can be retrieved in several ways:

All input as an array: $input = $request->all();

Single value (with optional default): $name = $request->input('name', 'default');

Array notation for nested fields: $value = $request->input('products.0.name');

Query‑string only: $name = $request->query('name');

Only a subset: $data = $request->only(['username', 'password']);

All except some keys: $data = $request->except(['credit_card']);

Laravel also supports dynamic properties, so $request->name will first look for an input value and then a route parameter.

To check if a parameter exists, use $request->has('name') (or pass an array for multiple keys). To ensure the value is present and non‑empty, use $request->filled('name') .

Previous input values stored in the session can be accessed with $request->old('username') , which is useful for repopulating forms after validation failures.

File uploads are handled via the request as well: retrieve a file with $file = $request->file('photo'); , check its presence with $request->hasFile('photo') , validate it with $request->file('photo')->isValid() , and obtain its path or extension using $request->photo->path() and $request->photo->extension() .