How does laravel accept an array from js?

Question

JavaScript

Silly question, but I'm confused. There is a script on the client that sends data to the server via ajax.
Sends data via axios, it looks like this:

this.$axios.post('/someurl', {
                    param1:       'value1',
                    param2:       'value2',
                    param3:       ['value3', 'value4', 'value5']
                })

This request goes to the server, where it is received on the Laravel side:

$param1 = request()->input('param1');
$param2 = request()->input('param2');
$param3 = request()->input('param3');

$param3 ends up being an array! What kind of magic and at what stage does it occur? Purely logically, I would send an array as a JSON string from the client, on the server I would accept it and parse it. Why does everything work?

Answer 1

By default, axios actually sends application/json, not application/x-www-form-urlencoded
You can check what exactly is sent to devtools, for example.
Perhaps Laravel automatically expands all of this into "regular" fields.
UPD: It looks like it is ( tyts ).
In its "raw" form, json was (in version 4.2, for example) available via Request::json->all(), then it was removed from the documentation.
Perhaps in the future (or already?) Will be removed from the code. Too lazy to check.