Jsdebug extends the asset pipeline for javascript logging.

Easily access your image assets in your JavaScript code

Jsonapi for Rails empowers your JSON API compliant APIs. Requires very little coding. http://jsonapi.org/format/

This gem allows you to filter and sort an ActiveRecord relation based on a request, following the JSON:API specification as closely as possible.

Use Jsonify for Rails View templates

JSON schema validation for Rails

A HTML5 client-side solution for generating PDFs.

Generate a ES6 module that contains Rails routes.

Color search for Rails

Make Kalendae available in the Rails asset pipeline.

An easy way to use LINE Front-end Framework(LIFF) on rails.

Simple Kaminari pagination in Cells.

kaminari-mongo_mapper lets your MongoMapper models be paginatable

Koi CMS admin framework

Katapult is a framework for generating base code for Rails applications in two leaps. Basics Generation prepares a new Rails application with lots of best practices, Model Transformation generates application code from a model of the application.

Rails UI plugin for Killbill administration.

An Active Record DSL extension that allows you to declare multiple associaitons with a block

Kazan creates rails project and setups predefined gems and tools.

Keycloak ruby client

A gem packaging of kickstrap.js for Rails 3.1+