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LoopBack 4 Example: Online Shopping APIs

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Continuous Integration Status

This project aims to represent an online ecommerce platform APIs to validate / test the LoopBack 4 framework readiness for GA. See for more information.

Shopping example overview diagram


Node.js >= 8.9.0 and running instances of a MongoDB and Redis server are required for the app to start. The Redis server is used for the shopping cart, while MongoDB is used for the rest of the models in the app.

Docker is required for running tests, make sure it is running if you want to run the tests.


Do the following to clone and start the project.

In case you have Docker installed on your system and don't want to manually install MongoDB and Redis, you can run

npm run docker:start
to download their images and start the servers. Otherwise, you can skip this command.
$ git clone
$ cd loopback4-example-shopping
$ npm i
$ npm run docker:start
$ npm start


The main app will be running at http://localhost:3000. The shopping website (Shoppy) is at http://localhost:3000/shoppy.html, and the API Explorer at http://localhost:3000/explorer/.

Shoppy website

You will also see

Recommendation server is running at http://localhost:3001.
, it is the server to which the
service will connect to get the recommendations for a user.

The app will be pre-populated with some products and users when it starts; and all existing products, users, shopping cart and orders will be deleted too. If you don't want to reset the database, set

in the application configuration object.


This repository comes with integration, unit, acceptance and end-to-end (e2e) tests. To execute these, see instructions below.

: prior to running the e2e tests the application must be running. On a different terminal do:
$ npm start

then on another terminal do the following to execute e2e tests:

$ npm run test:ui

For other tests:

$ npm test


This app has the following models:

  1. User
    - representing the users of the system.
  2. UserCredentials
    - representing sensitive credentials like a password.
  3. Product
    - a model which is mapped to a remote service by
  4. ShoppingCartItem
    - a model for representing purchases.
  5. ShoppingCart
    - a model to represent a user's shopping cart, can contain many items (
    ) of the type
  6. Order
    - a model to represent an order by user, can have many products (
    ) of the type
  7. KeyAndPassword
    - a model to represent the user's password reset request
  8. EmailTemplate
    - a model to represent the email request template for Nodemailer
  9. NodeMailer
    - a model to represent the response from Nodemailer after sending reset password email
  10. Envelope
    - a model to represent the envelope portion of the response from Nodemailer after sending reset password email
  11. ResetPasswordInit
    - a model to represent the request for initial password reset step

are marked as belonging to the
model by the use of the
model decorator. Correspondingly, the
model is marked as having many
s using the
model decorator. Although possible, a
relation for
has not be created in this particular app to limit the scope of the example.

is also marked as having one
model using the
decorator. The
relation for
has not been created to keep the scope smaller.


Controllers expose API endpoints for interacting with the models and more.

In this app, there are four controllers:

  1. ping
    - a simple controller to checking the status of the app.
  2. user-management
    - controller for creating user, fetching user info, updating user info, and logging in.
  3. shopping-cart
    - controller for creating, updating, deleting shopping carts, and getting the details about a shopping cart.
  4. user-order
    - controller for creating, updating, deleting orders, and getting the details about an order.
  5. product
    - controller for managing products catalog


Services are modular components that can be plugged into a LoopBack application in various locations to contribute additional capabilities and features to the application.

This app has five services:

  1. services/recommender.service
    - responsible for connecting to a "remote" server and getting recommendations for a user. The API endpoint at
    GET /users​/{userId}​/recommend
    , is made possible by this service.
  2. services/user-management.service
    - responsible for verifying if user exists and the submitted password matches that of the existing user.
  3. services/hash.password.bcryptjs
    - responsible for generating and comparing password hashes.
  4. services/validator
    - responsible for validating email and password when a new user is created.
  5. services/jwt.service
    - responsible for generating and verifying JSON Web Token.
  6. services/email.service
    - responsible for sending reset password email


Note: This app contains a

endpoint for the purpose of spike and demo, the authentication for the CRUD operations and navigational endpoints of model User is still in progress.


The endpoint for logging in a user is a

request to

Once the credentials are extracted, the logging-in implementation at the controller level is just a four step process. This level of simplicity is made possible by the use of the

service provided by
  1. const user = await this.userService.verifyCredentials(credentials)
    - verify the credentials.
  2. const userProfile = this.userService.convertToUserProfile(user)
    - generate user profile object.
  3. const token = await this.jwtService.generateToken(userProfile)
    - generate JWT based on the user profile object.
  4. return {token}
    - send the JWT.

You can see the details in



Endpoint authorization is done using @loopback/authorization. Use the

decorator to protect access to controller methods.

All controller methods without the

decorator will be accessible to everyone. To restrict access, specify the roles in the
property. Here are two examples to illustrate the point.

Unprotected controller method (no

decorator), everyone can access it:
async find(
  @param.query.object('filter', getFilterSchemaFor(Product))
  filter?: Filter,
): Promise {

Protected controller method, only

can access it:
  allowedRoles: ['admin', 'customer'],
  voters: [basicAuthorization],
async set(
  currentUserProfile: UserProfile,
  @param.path.string('userId') userId: string,
  @requestBody({description: 'update user'}) user: User,
): Promise {

There are three roles in this app:

, and
. You can go through the controller methods in user-controller.ts and shopping-cart.controller.ts to see which roles are given access to which methods.

The authorization implementation is done via voter functions. In this app, there is just a single voter function - 'basicAuthorization'. It implements the following rules:

  1. No access if the user was created without a
  2. No access if the user's role in not in the
    authorization metadata.
  3. User can access only model's belonging to themselves.
  4. admin
    roles bypass model ownership check.

For more details about authorization in LoopBack 4, refer to

JWT secret

By default, the JWTs will be signed using HS256 with a 64 character long string of random hex digits as secret. To use your own secret, set environment variable JWT_SECRET to the value of your own secret. You will want to use your own secret if running multiple instances of the application or want to generate or validate the JWTs in a different application.

You can see the details in


Reset Password

This repository includes a forgot password and reset password functionality that illustrates how shoppers can reset their password in the case they forgot them. Shoppers can either reset their password while logged in or locked out of the application. For this functionality we use Nodemailer. Please see if you're planning to use Nodemailer with Gmail. Additionally, to manage environment variables we use

, therefore, you must create a
file in the root of the project with the below contents:


There is a tutorial which shows how to apply the JWT strategy to secure your endpoint with

@loopback/[email protected]
. You can check more details in

Trying It Out

Please check the try it out section in the tutorial.

Deploy to Cloud as Microservices

The example application can be packaged as multiple Docker containers and deployed to a cloud environment as a Kubernetes cluster.

Please check out Deploy Shopping Application as Cloud-native Microservices.

Build and deploy on Red Hat OpenShift

You can find instructions, Dockerfiles and resource definition files for building and deploying on Red Hat OpenShift Container Platform in the openshift directory.


This project uses DCO. Be sure to sign off your commits using the

flag or adding
Signed-off-By: Name
in the commit message.


git commit -s -m "feat: my commit message"

Other LoopBack 4 Guidelines apply. See the following resources to get you started:


See all contributors.




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