JTRailsToolbox contains a list of common libs used for Ruby On Rails development.

Jubako gives multi-level layout inheritance in Rails view.

Easily add Judge client side validation to your Formtastic forms.

Oh please spare me.

Enable clients pool for twitter

jump_back helps you redirect to back with a default and simplifies saving a referring page for future redirects. See website https://github.com/pdebelak/jump_back for details.

Description of Jumpstarter.

Junctions built for ActiveRecord and Rails

collection of i18n helpers for rails app

juso is simple json serializer for web application

JustAuthMe is a gem to manage authorization in the simplest way possible. Most times you just want to check if an object belongs to the current user, JustAuthMe does just that withou any configuration.

Find your models with shortcuts. Transform numbers and arrays into AR objects.

The official justlogging.com gem

Rails JSON View Handler

A gem for alipay, contains mobile payment

JWT authentication for rails APIs

Json Web Token Authentication for devise users. It can be use for APIs.

Authentication middleware for Rails API that uses JWTs

Very simple auth with jwt for User model

A simple jwt gem for me