What is server-app?

This is a server for a photo voting application. It's built with Node.js and Express, which are tools for creating web services that handle requests and send back data, think of it as the engine behind an API that a frontend app (like a website or mobile app) talks to. At its core, the server stores and manages voting data for photos. When someone wants to vote on a photo or retrieve voting results, their request goes to this server, which processes it and returns the appropriate information. The server uses MongoDB, a database, to store all the voting information persistently. The README suggests this was deployed to Heroku (a hosting service) and includes sample endpoints showing how the API works, like /api/v1/Pages for accessing page data. The project appears to be part of a larger application with a separate client-side component, there's mention of a companion "client-app" that runs Ember (a frontend framework). The developer uses nodemon during development, which automatically restarts the server whenever code changes, making the development workflow faster. They're also running a local MongoDB instance to test the server before deploying it live. The README is fairly minimal and mostly just shows setup commands and links to a tutorial, so it doesn't explain all the specific features or architecture in detail. This looks like it was a learning project, probably built while following the Scotch.io tutorial on creating REST APIs with Node and Express. It would be useful for anyone building a voting or rating system for photos, or for developers learning how to set up a backend API with Node.js and a database.