This project rocks and uses MIT-LICENSE. Its provides restful api for registration and authentication of users. Response is JSON only. This engine supposed to support you backend application by providing authentication mechanism.

add following line in Gemfile

gem 'auth_api'

run following commands in console

rails g auth_api
rake db:migrate

to register a new user

curl http://yourdomain/your_path/register --data "name=test&password=password&email=abc@xyz.com" 

to authenticate an exising use

curl http://yourdomain/your_path/authenticate --data "password=password&email=abc@xyz.com" 

response is always in JSON format and has two fields:

• message: It contains user details or error message
• success: true or false based on success or failure of your request