How to correctly form GET requests to the API?

Question

API

I am making an API for a website (website - Laravel, client - vue.js). The following questions arose related to passing parameters via GET
How best to pass an array of data, for example, for filtering, sorting...:
1. http://site.dev/api/article?a[]=1&a[]=2&a[]= 2 - so we get the ready array in GET, but the request is not very convenient
2. http://site.dev/api/article?a=1|2|3 , and then in PHP we use explode('|', '1| 2|3')
3. http://site.dev/api/article?order_by=created_at,de... again use explode
4. etc., for example, to select only the required fields from the database, for pagination.
Are there any generally accepted rules or guidelines where you can see examples?

Answer 1

The best APIs are those that have the most intelligible and short parameters for the request.
Do not make a crutch out of the blue.
Use POST

Answer 2

Better json data in the post request, in this case.