Flat File API

Abstract

NOTE - THIS IS PRE-ALPHA SOFTWARE!

Flat File API is a command line tool to mock APIs using flat files.

You describe your API using a combination of folders containing JSON and JavaScript files, with some special naming which represents URL parameters. An Express server maps requests to files, and returns responses, like a real API.

As an example, the following file and folder structure...

+- api
    +- comments.json
    +- images.json
    +- posts
        +- category
        |   +- _name.js
        +- date
        |   +- year
        |       +- _month
        |       |   +- index.js
        |       +- index.js
        +- _id.js
        +- index.json

...generates the following routes...

/comments
/images
/posts
/posts/:id
/posts/category/:name
/posts/date/:year
/posts/date/:year/:month

...which return data from within the files.

This makes setting up an API for frontend development extremely fast and easy!

WIP

This package is a work in progress, with various planned features.

It will eventually run as a global script, allowing you to set up a flat-file API in any project, and run it on demand.

A browser plugin will intercept requests and will be able to respond with the local API version of files.

Features / planned features

Static and dynamic files

Static JSON files will their contents, but JavaScript files can be executed!

This allows you to do anything, but examples might be:

• loading and filtering related JSON file using the URL parameters
• generating output on the fly, perhaps using Array.map() or the like

The difference between this an a full API is:

• you can run this locally
• anyone can edit the files
• you can commit the API to the repo

Note that there are various rules around file prioritisation, which will get documented.

Custom file handlers

You can set up custom file handlers, based on the extension of the file, which you can use to transform the content of the file before returning:

{
  'posts.res.yaml': function (req, res) {
    // load yaml resource, then return
  }
}

For example, simulated CRUD interaction is planned with a .crud.json extension.

This will allow you to simply copy and paste a JSON array to a single file, then have the framework simulate the correct response by manipulating the file and returning a portion of it or such like.

Support for methods

Not finalised yet, but there should be support for alternative HTTP methods such as post, probably by naming the file differently:

comments.delete.json
comments.post.json
comments.put.json

Index file

Each API shows an index of all its routes from the root URL.

At some point this will show available HTTP methods as well. Additionally, a way to hint parameters per endpoint is planned, so APIs can be run interactively.

Demo

To play with the demo as it stands, clone and install:

git clone https://github.com/davestewart/flat-file-api.git
cd flat-file-api
npm install

Run with the following command:

npm run demo

To run your own API, run:

npm run start -- --root <relative or absolute path to your api>

Then, visit:

• http://localhost:3000

The index file should load with the demo API. The links are clickable, but you will need to edit the URL parameters yourself!

As such, here are some examples:

• http://localhost:3000/posts
• http://localhost:3000/posts/date/2017
• http://localhost:3000/posts/date/2017/01
• http://localhost:3000/products/300

Have fun...