Help me create an HTML form that uses JS to fill out a json text area

Job ID: 33807762

Budget: $10 – $30 USD

The idea is simple:

I have a large json config file. I need an html form built that when a user types in something from the HTML -> it inserts it into a specific spot in the json config file.

Once completed, all the required form fields are filled out, the user can click a "download" button of their generated json file.

That's it. Super easy. $25USD - we'll use the following bootstrap css/html:

https://bootswatch.com/simplex/
Related categories: JavaScript CSS HTML5 HTML jQuery / Prototype