I'm currently using the Joomla 3.3.6 and need to find a REST API to access the content information, user information and etc. I already tried to use the following REST API, which is developed by TechJoomla, but unable to find a proper documentation about the sample requests, authentication process and so on.

https://techjoomla.com/rest-api-for-joomla

And also i considered the jbackend REST API which is developed as an extension for joomla which seems to be a paid extension.

After lot of googling i'm still struggling to find a REST API to access the Joomla content. Please help me with this issue.

Thank you in advance.