What is CSRF Token?

CSRF refers to Cross Site Forgery attacks on web applications. CSRF attacks are the unauthorized activities which the authenticated users of the system perform. As such, many web applications are prone to these attacks. Laravel offers CSRF protection in the following way − Laravel includes an in built CSRF plug-in, that generates tokens for each active user session. These tokens verify that the operations or requests are sent by the concerned authenticated user.

CSRF is implemented within HTML forms declared inside the web applications. You have to include a hidden validated CSRF token in the form, so that the CSRF protection middleware of Laravel can validate the reques

File name : index.php

<form method = "POST" action="/profile">
{{ csrf_field() }}
OR
@csrf
</form>

csrf token mismatch in POST Request.

when you send a post request using ajax then you must have to add csrf token manually.

$.ajax({
type: "POST",
data: {"id": id,"_token": "{{ csrf_token() }}"},
url: "your url",
success: function(msg){
// do do do do ......
}
});

If you are using this ajax call request into a separate javascript file then you can set the csrf token in html meta element

File name : index.php

And you can access this token into your ajax call request

$.ajax({
type: "POST",
data: {"_token": $('meta[name="csrf-token"]').attr('content')},
url: 'url',
success: function(msg){
// do whatever you want with the response
}
});

each and every request goes through middileware. Laravel automatically handle the request. And the middleware does not allow to any post request without a correct csrf token. If you are sending the request through laravel form then it automatically generates a csrf token in the input hidden field. But when you send a post request through ajax then you must have to supply csrf token manually

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