I published a Postman collection which gives a short description on each method as well as provides examples. You can choose FS-API-Local to use the API locally or FS-API-Heroku environment.
Trying to access any other paths/routes of the API (using any HTTP verb) will result in BAD_REQUEST HTTP status as well as an error message.
Make sure you have node and npm installed. Run npm install && npm start in the command line. Default port is http://localhost:3000 but can be changed in constants.js. The local version can run on platforms that support Unix style paths (includes macOS and Linux).
I'm also hosting the app on Heroku and you can use this base URL https://yos-fs-api.herokuapp.com to connect to the API. This is just a playground alternative to the local installation for showcasing the API calls. Please bear in mind that files created by other users may be present. Also Heroku may delete the uploaded files any time so this service should in no way be used as any kind of hosting solution.
.
├── README.md
├── app.js
├── package.json
├── src
│ ├── config
│ │ └── constants.js
│ ├── controllers
│ │ ├── OSController.js
│ │ ├── dirController.js
│ │ └── filesController.js
│ ├── routes
│ │ ├── OSRoutes.js
│ │ ├── directoryRoutes.js
│ │ └── filesRoutes.js
│ └── utils
│ └── utils.js
└── storage