When attempting to access http://localhost:3000/traceur in Angular 2 with the angular-in-memory-web-api, a 404 (Not Found) error

Hello, I'm encountering an issue with angular-in-memory-web-api. I have attempted to use angular2-in-memory-web-api in SystemJS and other solutions, but without success. I am currently using the official quickstart template. Thank you for any assistance.

List of Errors

zone.js:1382 GET http://localhost:3000/traceur 404 (Not Found)
dashboard:19 Error: (SystemJS) XHR error (404 Not Found) loading 
http://localhost:3000/traceur
    Error: XHR error (404 Not Found) loading http://localhost:3000/traceur
        at XMLHttpRequest.wrapFn [as _onreadystatechange] (http://localhost:3000/node_modules/zone.js/dist/zone.js:698:29)
        at ZoneDelegate.invokeTask (http://localhost:3000/node_modules/zone.js/dist/zone.js:265:35)
        at Zone.runTask (http://localhost:3000/node_modules/zone.js/dist/zone.js:154:47)
        at XMLHttpRequest.ZoneTask.invoke (http://localhost:3000/node_modules/zone.js/dist/zone.js:335:33)
    Error loading http://localhost:3000/traceur
    Unable to load transpiler to transpile http://localhost:3000/node_modules/angular-in-memory-web-api/in-memory-web-api.module.js
    Error loading http://localhost:3000/node_modules/angular-in-memory-web-api/in-memory-web-api.module.js as "angular-in-memory-web-api/in-memory-web-api.module" from http://localhost:3000/app/app.module.js
        at XMLHttpRequest.wrapFn [as _onreadystatechange] (http://localhost:3000/node_modules/zone.js/dist/zone.js:698:29)
        at ZoneDelegate.invokeTask (http://localhost:3000/node_modules/zone.js/dist/zone.js:265:35)
        at Zone.runTask (http://localhost:3000/node_modules/zone.js/dist/zone.js:154:47)
        at XMLHttpRequest.ZoneTask.invoke (http://localhost:3000/node_modules/zone.js/dist/zone.js:335:33)
    Error loading http://localhost:3000/traceur
    Unable to load transpiler to transpile http://localhost:3000/node_modules/angular-in-memory-web-api/in-memory-web-api.module.js
    Error loading http://localhost:3000/node_modules/angular-in-memory-web-api/in-memory-web-api.module.js as "angular-in-memory-web-api/in-memory-web-api.module" from http://localhost:3000/app/app.module.js

My consignJS

/**
 * System configuration for Angular samples
 * Adjust as necessary for your application needs.
 */
(function (global) {
  System.config({
    paths: {
      // paths serve as alias
      'npm:': 'node_modules/'
    },
    // map tells the System loader where to look for things
    map: {
      // our app is within the app folder
      app: 'app',

      // angular bundles
      '@angular/core': 'npm:@angular/core/bundles/core.umd.js',
      '@angular/common': 'npm:@angular/common/bundles/common.umd.js',
      '@angular/compiler': 'npm:@angular/compiler/bundles/compiler.umd.js',
      '@angular/platform-browser': 'npm:@angular/platform-browser/bundles/platform-browser.umd.js',
      '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js',
      '@angular/http': 'npm:@angular/http/bundles/http.umd.js',
      '@angular/router': 'npm:@angular/router/bundles/router.umd.js',
      '@angular/forms': 'npm:@angular/forms/bundles/forms.umd.js',
      '@angular/upgrade': 'npm:@angular/upgrade/bundles/upgrade.umd.js',

      // other libraries
      'rxjs':                      'npm:rxjs',
      'angular-in-memory-web-api': 'npm:angular-in-memory-web-api',
    },
    // packages tells the System loader how to load when no filename and/or no extension
    packages: {
      app: {
        main: './main.js',
        defaultExtension: 'js'
      },
      rxjs: {
        defaultExtension: 'js'
      },
      'angular-in-memory-web-api': {
        main: './index.js',
        defaultExtension: 'js'
      }
    }
  });
})(this);

Package.json

{
  "name": "angular-quickstart",
  "version": "1.0.0",
  "description": "QuickStart package.json from the documentation, supplemented with testing support",
  "scripts": {
    "start": "tsc && concurrently \"tsc -w\" \"lite-server\" ",
    "docker-build": "docker build -t ng2-quickstart .",
    "docker": "npm run docker-build && docker run -it --rm -p 3000:3000 -p 3001:3001 ng2-quickstart",
    "pree2e": "npm run webdriver:update",
    "e2e": "tsc && concurrently \"http-server -s\" \"protractor protractor.config.js\" --kill-others --success first",
    "lint": "tslint ./app/**/*.ts -t verbose",
    "lite": "lite-server",
    "postinstall": "typings install",
    "test": "tsc && concurrently \"tsc -w\" \"karma start karma.conf.js\"",
    "test-once": "tsc && karma start karma.conf.js --single-run",
    "tsc": "tsc",
    "tsc:w": "tsc -w",
    "typings": "typings",
    "webdriver:update": "webdriver-manager update"
  },
  "keywords": [],
  "author": "",
  "licenses": [
    {
      "type": "MIT",
      "url": "https://github.com/angular/angular.io/blob/master/LICENSE"
    }
  ],
  "dependencies": {
    "@angular/common": "~2.1.0",
    "@angular/compiler": "~2.1.0",
    "@angular/core": "~2.1.0",
    "@angular/forms": "~2.1.0",
    "@angular/http": "~2.1.0",
    "@angular/platform-browser": "~2.1.0",
    "@angular/platform-browser-dynamic": "~2.1.0",
    "@angular/router": "~3.1.0",
    "@angular/upgrade": "~2.1.0",

    "angular2-in-memory-web-api": "~0.1.5",
    "bootstrap": "^3.3.7",
    "systemjs": "0.19.39",
    "core-js": "^2.4.1",
    "reflect-metadata": "^0.1.8",
    "rxjs": "5.0.0-beta.12",
    "zone.js": "^0.6.25"
  },
  "devDependencies": {
    "concurrently": "^3.0.0",
    "lite-server": "^2.2.2",
    "typescript": "^2.0.3",
    "typings": "^1.4.0",

    "canonical-path": "0.0.2",
    "http-server": "^0.9.0",
    "tslint": "^3.15.1",
    "lodash": "^4.16.2",
    "jasmine-core": "~2.5.2",
    "karma": "^1.3.0",
    "karma-chrome-launcher": "^2.0.0",
    "karma-cli": "^1.0.1",
    "karma-htmlfile-reporter": "^0.3.4",
    "karma-jasmine": "^1.0.2",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "^3.3.0",
    "rimraf": "^2.5.4"
  },
  "repository": {}
}

App Module

import { NgModule }       from '@angular/core';
import { BrowserModule }  from '@angular/platform-browser';
import { FormsModule }    from '@angular/forms';
import {HttpModule} from "@angular/http";
import { AppRoutingModule }     from './app-routing.module';
import { InMemoryWebApiModule } from 'angular-in-memory-web-api/in-memory-web-api.module';
import { InMemoryDataService }  from './in-memory-data.service';


import { AppComponent }         from './app.component';
import { DashboardComponent }   from './dashboard.component';
import { HeroDetailComponent }  from './hero-detail.component';
import { HeroesComponent }      from './heroes.component';
import { HeroService }          from './hero.service';




@NgModule({
  imports: [
    BrowserModule,
    FormsModule,
    HttpModule,
    InMemoryWebApiModule.forRoot(InMemoryDataService),
    AppRoutingModule
  ],
  declarations: [
    AppComponent,
    DashboardComponent,
    HeroDetailComponent,
    HeroesComponent
  ],
  providers: [ HeroService ],
  bootstrap: [ AppComponent ]
})
export class AppModule { }
javascriptapiangulartypescript

Answer №1

Version 0.1.13 of angular2-in-memory-web-api introduced significant changes that seem to have not been reflected in the tutorial yet.

The changelog indicates the following updates need to be made:

In systemjs.config.js, adjust the mapping to:

'angular-in-memory-web-api': 'npm:angular-in-memory-web-api/bundles/in-memory-web-api.umd.js'

and then remove from packages:

'angular-in-memory-web-api': {<br>
    main: './index.js',<br>
    defaultExtension: 'js'<br>
  }

For more details, refer to the changelog https://github.com/angular/in-memory-web-api/blob/master/CHANGELOG.md#0113-2016-10-20

A related issue has been logged https://github.com/angular/in-memory-web-api/issues/58

The update also requires modifying app.module.ts by changing

import { InMemoryWebApiModule } from 'angular-in-memory-web-api/in-memory-web-api.module';

to

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

Answer №2

Despite trying all the solutions mentioned earlier, I continued to encounter the following error:

"originalStack": "Error: (SystemJS) XHR error (404 Not Found) loading node_modules/angular-in-memory-web-api/bundles/in-memory-web-api.umd.js\n\tError: XHR error (404 Not Found) loading node_modules/angular-in-memory-web-api/bundles/in-memory-web-api.umd.js\n\t    at XMLHttpRequest.wrapFn [as _onreadystatechange] (node_modules/zone.js/dist/zone.js:889:29) [<root>]\n\t    at Zone.runTask (node_modules/zone.js/dist/zone.js:151:47) [<root> => <root>]

Upon further investigation, I discovered that this issue only arises during karma tests (and no, I do not attempt to start the server if tests fail).

This solution resolved the problem for me:

  • Updated the systemjs.config.js file as suggested by others here (and subsequently fixed in the original sample code): 

    'angular-in-memory-web-api': 'npm:angular-in-memory-web-api/bundles/in-memory-web-api.umd.js',

  • Included the following in karma.conf.js: 

    
files: [
(...)
'node_modules/angular-in-memory-web-api/bundles/in-memory-web-api.umd.js',
(...)
{ pattern: 'node_modules/angular-in-memory-web-api/**/*.js', included: false, watched: false },
]

Additionally, I had to define a provider for 

{ provide: APP_BASE_HREF, useValue:  "/" }
because karma does not utilize the index.html file.

After implementing these changes, all tests passed successfully and I was able to proceed with "npm start" :-)

Answer №3

Even after following advice from @joel and researching on github, I was still encountering the same error.

If you are experiencing a similar issue, try the following steps:

Insert this line into the "map" object in your systemjs.config.js file:

'angular-in-memory-web-api': 'node_modules/angular-in-memory-web-api/bundles/in-memory-web-api.umd.js',

This points to the umd.js file located in the node_modules directory.

In the packages object of the systemjs.config.js file, add the following line:

'angular-in-memory-web-api': 'npm:angular-in-memory-web-api/bundles/in-memory-web-api.umd.js',

These modifications are only effective for versions higher than 0.1.13. Verify in your package.json that "angular-in-memory-web-api" is version 0.1.13 or above, like so:

"angular-in-memory-web-api": "~0.1.13",

I hope this provides a solution!

Answer №4

After following Joel's solution in the tutorial, it led me to encounter another issue which resulted in the following error message.

ctorParameters.map is not a function at ReflectionCapabilities.parameters

This problem guided me towards finding a resolution here: Updating angular-in-memory-web-api

To resolve this, I needed to update the version of "angular-in-memory-web-api" from 0.1.13 to 0.2.0 in packages.json

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