Update in Javascript to slice and edit json content in multiple input fields

Job ID: 35577163

Budget: ₹600 – ₹1,500 INR

So I already have a Javascript that changes few words inside Json which is located in an input field, I basically want to modernize and update few functions to not only change the words inside archive that hosts the json but also static elements on the website.
Related categories: JavaScript HTML5 HTML AngularJS JSON