This article explains what HTTP requests are and how to POST JSON data in JavaScript. Learn about common pitfalls and handy tools to fetch JSON data.
Json Editor Online
Tools IndepthThere is a lot of great tooling available to work with JSON data. See what is out there and learn when and how to use them in the following articles.

4 handy categories of JSON tools and when to use them
There are different kinds of tools to help you work with JSON data. Learn about 4 different types of JSON tools and when to use them.