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0.0.21 • Public • Published

Angular 2 in-memory-web-api


This is the last of the npm packages under the name angular2-in-memory-web-api. The new package name is (or soon will be) angular-in-memory-web-api. All versions after 0.0.21 are (or soon will be) shipped under this new name. Be sure to update your package.json and import statements accordingly.

An in-memory web api for Angular demos and tests.

It will intercept HTTP requests that would otherwise go to the remote server via the Angular XHRBackend service

This in-memory web api service processes an HTTP request and returns an Observable of HTTP Response object in the manner of a RESTy web api. It natively handles URI patterns in the form :base/:collectionName/:id?


  // for store with a 'heroes' collection
  GET api/heroes          // all heroes
  GET api/heroes/42       // the character with id=42
  GET api/heroes?name=^j  // 'j' is a regex; returns heroes whose name contains 'j' or 'J'
  GET api/heroes.json/42  // ignores the ".json"

Also accepts "commands":

  POST "resetDb",
  GET/POST "config"" - get or (re)set the config

Basic usage

Create an InMemoryDataService class that implements InMemoryDataService.

At minimum it must implement createDb which creates a "database" hash whose keys are collection names and whose values are arrays of collection objects to return or update. For example:

import { InMemoryDbService } from 'angular-in-memory-web-api';

export class InMemHeroService implements InMemoryDbService {
  createDb() {
    let heroes = [
      { id: '1', name: 'Windstorm' },
      { id: '2', name: 'Bombasto' },
      { id: '3', name: 'Magneta' },
      { id: '4', name: 'Tornado' }
    return {heroes};

Register this module and your service implementation in AppModule.imports calling the forRoot static method with this service class and optional configuration object:

// other imports
import { HttpModule }           from '@angular/http';
import { InMemoryWebApiModule } from 'angular-in-memory-web-api';

import { InMemHeroService }     from '../app/hero-data';
 imports: [
export class AppModule { ... }

See examples in the such as the Server Communication and Tour of Heroes chapters.

Bonus Features

Some features are not readily apparent in the basic usage example.

The InMemoryBackendConfigArgs defines a set of options. Add them as the second forRoot argument:

   InMemoryWebApiModule.forRoot(InMemHeroService, { delay: 500 }),

Simple query strings

Pass custom filters as a regex pattern via query string. The query string defines which property and value to match.

Format: /app/heroes/?propertyName=regexPattern

The following example matches all names containing the letter 'j' in the heroes collection.


To Do

  • add tests (shameful omission!)

Build Instructions

Mostly gulp driven.

The following describes steps for updating from one Angular version to the next

This is essential even when there are no changes of real consequence. Neglecting to synchronize Angular 2 versions triggers typescript definition duplication error messages when compiling your application project.

  • gulp bump - up the package version number

  • update CHANGELOG.MD to record the change

  • update the dependent version(s) in package.json

  • npm install the new package(s) (make sure they really do install!)
    npm list --depth=0

  • consider updating typings, install individually/several: npm run typings -- install packagename --ambient --save

    NB: Do not add to npm postinstall as that screws up consumers!

  • npm run typings install

  • npm run tsc to confirm the project compiles w/o error (sanity check)

-- NO TESTS YET ... BAD --

  • gulp build

  • commit and push

  • npm publish

  • Fix and validate docs samples

  • Add two tags to the release commit with for unpkg

    • the version number
    • 'latest'




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