0.6.0 • Public • Published

    REST Server front-end interface for EWD.js Systems: ewdrest

    This module provides a REST interface to one or more EWD.js systems.

    It rewrites incoming REST URLs and rewrites them as signed EWD.js HTTP URLs and routes them to an EWD.js server where a back-end module provides the web service logic.

    Rob Tweed rtweed@mgateway.com
    13 February 2014, M/Gateway Developments Ltd http://www.mgateway.com

    Twitter: @rtweed

    Google Group for discussions, support, advice etc: http://groups.google.co.uk/group/enterprise-web-developer-community

    Installing the REST interface for EWD.js

       npm install ewdrest

    Using the EWD REST Server interface

    Define a configuration object that specifies:

    • the port on which the REST Server listens;
    • the mapping between REST URL and the EWD.js server(s)
    • the mapping between REST URL and the back-end EWD.js module(s)

    Then start the REST server using this configuration object


       var ewdrest = require('ewdrest');
       var params = {
         // REST server listener port
         restPort: 8081,
         // service module mapping
         service: {
           myService: {
             module: 'myModule',
             service: 'parse',
             contentType: 'application/json'
         // EWD.js server mapping
         server: {
           somewhere: {
             host: 'www.somewhere.com',
             port: 8080,
             ssl: true,
             secretKey: 'TakeARest!',
             accessId: 'RESTServer'

    This example will forward all GET, POST, DELETE and PUT REST request URLs of the form:


    to the EWD.js server at www.somewhere.com:8080, where a service named parse in an EWD.js module named myModule will be invoked to handle the request.


      /somewhere defines the EWD.js server route
      /myService is a proxy to the back-end EWD.js module name

    Parsing the rest of the URL and determining which HTTP Verb(s) are valid is the responsibility of the EWD.js back-end module.

    A valid back-end response should return a JSON response whose content is up to you.
    An error response is of the form:

       {error: 'Your specific error message'}  

    Note: the accessId and secretKey must be registered on the EWD.js server, along with any back-end modules that requests signed by the accessId are allowed to invoke. See the chapter on Web Service Interface in the EWD.js User Guide.


    Copyright (c) 2014 M/Gateway Developments Ltd,
    Reigate, Surrey UK.
    All rights reserved.

    Email: rtweed@mgateway.com

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at


    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and
    limitations under the License.




    npm i ewdrest

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