# Emoncms > Emoncms is an open source web application for processing, logging and visualising energy, temperature and other environmental data. Data is posted to and read from https://emoncms.org/ over a simple HTTP API, authenticated with per account API keys. ## API reference - [Full API reference, markdown](https://emoncms.org/site/api.md): every endpoint with parameters, example requests and notes. Use this to write API client code. - [Full API reference, JSON](https://emoncms.org/site/api.json): the same reference as structured JSON. - [Interactive API explorer](https://emoncms.org/site/api): getting started guide and browsable reference, requires javascript. ## Documentation - [Emoncms guide](https://docs.openenergymonitor.org/emoncms/index.html) - [OpenEnergyMonitor documentation](https://docs.openenergymonitor.org) - [Community forum](https://community.openenergymonitor.org) - [Emoncms source code](https://github.com/emoncms/emoncms)