Visual Form Builder With JavaScript – EasyJsonForm.js
A free open-source JavaScript library that provides a visual interface to help you easily create HTML forms.
JavaScript & CSS form builder
Custom Form Builder With Field Interactions – Dynamic Forms
A powerful and customizable form builder that supports dynamic field interactions such as asynchronously fetching data, reading/updating data and state, showing and hiding elements, etc.
Form To JSON And JSON To Form Converter – form-data-json
Form To JSON And JSON To Form Converter in JavaScript.
Beautiful Interative HTML Form Creator With JavaScript – FormaJS
FormaJS is a Vanilla JavaScript form creator library to create a customizable, interactive, pretty nice HTML form from minimal form markup.
Responsive JSON Form Generator – AOForm
Yet another dynamic form generator/builder/creator written in pure JavaScript.
Populate Form fields From JSON – populatejs
populatejs is a pure JavaScript plugin for dynamic form creation that populates existing form fields from a JSON object.