Almost the entire app was written in Javascript, with JSON-based configuration and data storage. The following components were written and/or configured with Javascript:

Most server-side scripts, all unit tests, all build tools, etc. were driven by NodeJS.
ExpressJS served as the 'backend' server framework.
MongoDB (which stores essential JSON) was the main database.
MongooseJS was used as the main ORM for communicating with the database, with KnexJS used for certain edge cases.
MochaJS, ChaiJS, and ExpectJS were used for unit testing.
Frontend builds were done with Gulp and Webpack.
Package management was done primarily with npm - with a few exceptions that required the use of Bower (also configured with JSON).
"Templating" was done with Javascript dialect JSX.
The frontend was build primarily with ReactJS (as the View) and Redux (as the Controller / Store / frontend model).
Configuration was done with json files.

The only notable exceptions were the use of SCSS (augmented by Compass) for styling, Bash for a few basic 'system chores' and CLI utilities required for development of the app (most notably git and heroku's CLI interface), and a bit of custom SQL for locations where the ORM extractions leaked (the app is DB-agnostic, but a bit of SQL was required to fill gaps in the ORMs when interfacing with Postgres). JavaScript

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