With typicode's MyJSONServer online service(https://my-json-server.typicode.com/) and a simple GitHub repo, you can have your own online fake REST server in seconds.
https://my-json-server.typicode.com/Finoy/fake-api/users/
You can use GET, POST, PUT, PATCH and DELETE. Changes aren't persisted between calls.
Run this code in a console or from any site:
fetch('https://my-json-server.typicode.com/Finoy/fake-api/users/1')
.then(response => response.json())
.then(json => console.log(json))A free, open-source API for generating random user data. Like Lorem Ipsum, but for people.