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Fortune.js is a library for managing data in Node.js and web browsers. It segregates data access, business logic, and external I/O, providing a baseline for interoperability and allowing each implementation to be swapped interchangeably.

The latest version is 2.1.3, get it from npm:

npm install fortune --save


Fortune.js has a minimal public interface, mostly just the constructor and request method. Calling request dispatches calls to three extensible interfaces that work together: Adapter, Serializer, and transform functions, based on the request data.

Included are networking wrappers which call the request method, so it is not coupled with any external protocol, and it should be able to work with any transport layer such as HTTP and WebSocket.


The only necessary input is record type definitions. Here's a model of a basic micro-blogging service:

const fortune = require('fortune')

const store = fortune({
  user: {
    name: { type: String },

    // Following and followers are inversely related (many-to-many).
    following: { link: 'user', inverse: 'followers', isArray: true },
    followers: { link: 'user', inverse: 'following', isArray: true },

    // Many-to-one relationship of user posts to post author.
    posts: { link: 'post', inverse: 'author', isArray: true }
  post: {
    message: { type: String },

    // One-to-many relationship of post author to user posts.
    author: { link: 'user', inverse: 'posts' }

By default, the data is persisted in memory. There are adapters for databases such as MongoDB, Postgres, and NeDB. To make a request internally:

  type: 'user',
  method: 'create',
  payload: [ { name: 'John Doe' }, { name: 'Jane Doe' } ]

The first call to request will trigger a connection to the data store, and it returns the result as a Promise.

Then let's add a HTTP server:

const http = require('http')

// The `` helper function returns a listener function which
// does content negotiation, and maps the internal response to a HTTP response.
const server = http.createServer(

store.connect().then(() => server.listen(1337))

This yields an ad hoc JSON over HTTP API. There are serializers for Micro API (JSON-LD) and JSON API, which also accept HTTP parameters. In addition, Fortune.js implements a wire protocol based on WebSocket and MessagePack.

See the plugins page for more details.

Features and Non-Features#


Fortune.js is written in ECMAScript 5.1 syntax, with some ECMAScript 6 additions.