JS-Data Router

This library provides a set of default Express routes and handlers for use with JSData to enable rapid RESTful API prototyping

Installation

npm install should get you all you need: npm install jsdatarouter

Usage

The JSDataRouter is an ES6 class that takes a JSData resource definition (the same returned by DS.defineResource) and express router object in its constructor and sets up RESTful routes and handlers on the router passed in. If no router is provided it will create a new one using express.Router()

var DS = require('../DataStore'),
  JSDataRouter = require('jsdatarouter'),
  express = require('express'),
  router = new JSDataRouter(DS.store.definitions.state).router;
 
module.exports = function (app) {
  app.use('/todo', router);
};

Default Actions

CREATE: POST /

create:

calls the JSData create function with req.body as the argument

afterCreate:

sends the resource instance created in the create function and calls end()

DESTROY: DELETE /:resourceId

destroy

calls the JSData destroy function with resourceId as the argument

afterDestroy:

sends a blank 200 response

FIND: GET /:resourceId

find:

calls next()

afterFind:

sends the found resource instance and calls end()

FINDALL: GET /

findAll:

retrieves all resource instances from the DataStore by calling the JSData findAll function with req.query and a param object of the form { with: req.with } allowing you to specify eager-loads

afterFindAll:

sends the resource instances located in the findAll function and calls end()

UPDATE: PUT /:resourceId

update:

calls the JSData update function on the resource instance with the id of resourceId using req.body as an argument

afterUpdate:

sends the resource instance that was updated in the update function and calls end()

Extending Actions

Every function on the JSDataRouter class can be re-implemented to add additional functionality. The example below adds server-side validation to a CREATE route before creating the resource instance.

function validateCreateInput(req) {
  // ...
}
 
class TodoRouter extends JsDataRouter {
  beforeCreate(req, res, next) {
    validateCreateInput(req);
    var errors = req.validationErrors();
    if(errors) {
      res.send('validation errors: ' + util.inspect(errors), 400).end();
      return;
    }
    next();
  }
}

Param Callback

Routes that include a resourceId parameter will automatically retrieve the resource instance that has the specified ID form the DataStore using an express param callback, and make it available via req.resource. Query parameters and eager-loads (specified on req.with) along to the JSData find function when looking up the resource instance.

Options

By default all routes are enabled, but an optional options object can be passed into the constructor as a 3rd argument that allows you to disable each action individually. The example below will setup a new router with only the destroy route disabled.

var router = new JSDataRouter(
  DS.store.definitions.state,
  express.Router(), {
    destroy: false
  }
);