Middleware groups in Laravel - Step-by-Step Execution

Concept Flow - Middleware groups

Request enters app

↓

Check middleware group

↓

Run first middleware in group

↓

Run next middleware in group

↓

All middleware passed

↓

Controller handles request

↓

Response sent back

The request passes through each middleware in the group one by one before reaching the controller.

Execution Sample

Laravel

Route::middleware(['web'])->group(function () {
    Route::get('/dashboard', function () {
        return 'Dashboard';
    });
});

This code runs all middleware in the 'web' group before showing the dashboard page.

Execution Table

Step	Middleware Group	Middleware Run	Action	Result
1	web	EncryptCookies	Encrypt cookies in request	Cookies encrypted
2	web	AddQueuedCookiesToResponse	Add cookies to response queue	Cookies queued
3	web	StartSession	Start user session	Session started
4	web	ShareErrorsFromSession	Share errors from session	Errors shared
5	web	VerifyCsrfToken	Check CSRF token	Token verified
6	web	SubstituteBindings	Bind route parameters	Bindings substituted
7	web	Controller	Run controller action	Dashboard returned
8	web	Response	Send response back	Response sent

💡 All middleware in 'web' group ran successfully, request handled by controller.

Variable Tracker

Variable	Start	After Step 1	After Step 2	After Step 3	After Step 4	After Step 5	After Step 6	After Step 7	Final
Request State	Raw request	Cookies encrypted	Cookies queued	Session started	Errors shared	Token verified	Bindings substituted	Controller processed	Response ready

Key Moments - 2 Insights

Why does the request go through multiple middleware before reaching the controller?

Because middleware groups run each middleware in order to prepare or check the request, as shown in execution_table steps 1 to 6 before the controller runs at step 7.

What happens if one middleware in the group fails?

The request stops processing further middleware and controller, preventing the action. This is implied by the exit_note that all middleware must pass.

Visual Quiz - 3 Questions

Look at the execution_table, what middleware runs right before the controller?

A VerifyCsrfToken

B StartSession

C SubstituteBindings

D AddQueuedCookiesToResponse

💡 Hint

Check the 'Middleware Run' column at step 6 in the execution_table.

At which step is the user session started according to the execution_table?

A Step 3

B Step 2

C Step 5

D Step 7

💡 Hint

Look for 'StartSession' in the 'Middleware Run' column.

If the 'VerifyCsrfToken' middleware fails, what happens to the request flow?

A It continues to the controller

B It stops before the controller

C It skips to the last middleware

D It restarts the middleware group

💡 Hint

Refer to the key_moments explanation about middleware failure stopping the request.

Concept Snapshot

Middleware groups run multiple middleware in order on a request.
Each middleware can modify or check the request.
If all pass, the controller runs.
If any fail, the request stops.
Use Route::middleware(['group'])->group(...) to apply groups.

Full Transcript

Middleware groups in Laravel let you run many middleware one after another on a request. When a request comes in, Laravel checks which middleware group applies. It runs each middleware in that group step by step. For example, the 'web' group runs middleware like EncryptCookies, StartSession, and VerifyCsrfToken before the controller handles the request. If all middleware pass, the controller runs and returns a response. If any middleware fails, the request stops and the controller does not run. This helps keep requests safe and prepared. You define middleware groups in your route files using Route::middleware(['group'])->group(...).