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npm version GitHub contributors sourceloop survey-service downloads License Pb Loopback


A LoopBack microservice used for creating survey using different entities like questions, question-templates,sections.

  • Questions - A Question can be created of multiple types like Multi Selection,Single Selection,Text , Drop Down , Scale.
  • Question Template - A question template consists of a group of questions which can be directly used in a survey.
  • Survey - Questions can be added to survey via question-templates or individual questions itself.
  • Section -Section can be created inside a survey and questions can be added to it.
  • Survey cycles - If there is a need for periodic re-assessment of the survey we need to create survey cycles which can be quarterly, monhtly,annually etc as per the business requirement.
  • Survey responder -Responders are users who can respond to the survey. Survey responders can be created ,updated,deleted for a survey.


Install SurveyServiceComponent using npm;

$ [npm install | yarn add] @sourceloop/survey-service


  • Install the audit service npm i @sourceloop/survey-service

  • Set the environment variables.

  • Run the migrations.

  • Add the SurveyServiceComponent to your Loopback4 Application (in application.ts).

    // import the SurveyServiceComponent
    import {SurveyServiceComponent} from '@sourceloop/survey-service';
    // add Component for SurveyServiceComponent
  • Set up a Loopback4 Datasource with dataSourceName property set to SurveyDbSourceName. You can see an example datasource here.

  • Using with Sequelize

    This service supports Sequelize as the underlying ORM using @loopback/sequelize extension. And in order to use it, you'll need to do following changes.

    • To use Sequelize in your application, add following to application.ts:
      useCustomSequence: false,
      useSequelize: true,
    • Use the SequelizeDataSource in your audit datasource as the parent class. Refer this for more.
  • Start the application npm start

Environment Variables

Do not forget to set Environment variables. The examples below show a common configuration for a MySQL Database running locally.

Name Required Default Value Description
NODE_ENV Y Node environment value, i.e. dev, test, prod
LOG_LEVEL Y Log level value, i.e. error, warn, info, verbose, debug
HOST Y Host for the service to run under, i.e.
PORT Y 3000 Port for the service to listen on.
DB_HOST Y Hostname for the database server.
DB_PORT Y Port for the database server.
DB_USER Y User for the database.
DB_PASSWORD Y Password for the database user.
DB_DATABASE Y Database to connect to on the database server.
DB_SCHEMA Y public Database schema used for the data source. In MYSQL, this will be main unless a schema is made explicitly for the service.
JWT_SECRET Y Symmetric signing key of the JWT token.
JWT_ISSUER Y Issuer of the JWT

Setting up a DataSource

Here is a Sample Implementation DataSource implementation using environment variables.

import {inject, lifeCycleObserver, LifeCycleObserver} from '@loopback/core';
import {juggler} from '@loopback/repository';
import {SurveyDbSourceName} from '@sourceloop/survey-service';

const config = {
  name:  SurveyDbSourceName,
  connector:  'mysql',
  url:  '',
  host:  process.env.DB_HOST,
  port:  process.env.DB_PORT,
  user:  process.env.DB_USER,
  password:  process.env.DB_PASSWORD,
  database:  process.env.DB_DATABASE,
  schema:  process.env.DB_SCHEMA,

// Observe application's life cycle to disconnect the datasource when
// application is stopped. This allows the application to be shut down
// gracefully. The `stop()` method is inherited from `juggler.DataSource`.
// Learn more at https://loopback.io/doc/en/lb4/Life-cycle.html
export class MysqlDataSource
  extends juggler.DataSource
  implements LifeCycleObserver
  static dataSourceName = SurveyDbSourceName;
  static readonly defaultConfig = config;

    @inject('datasources.config.mysql', {optional: true})
    dsConfig: object = config,
  ) {


The migrations required for this service are processed during the installation automatically if you set the SURVEY_MIGRATION or SOURCELOOP_MIGRATION env variable. The migrations use [db-migrate] with [db-migrate-mysql] driver for migrations, so you will have to install these packages to use auto-migration. Please note that if you are using some pre-existing migrations or databases, they may be affected. In such a scenario, it is advised that you copy the migration files in your project root, using the SURVEY_MIGRATION_COPY or SOURCELOOP_MIGRATION_COPY env variables. You can customize or cherry-pick the migrations in the copied files according to your specific requirements and then apply them to the DB.

Additionally, there is now an option to choose between SQL migration or PostgreSQL migration. NOTE : For @sourceloop/cli users, this choice can be specified during the scaffolding process by selecting the "type of datasource" option.

Common Headers

Authorization: Bearer where is a JWT token signed using JWT issuer and secret. Content-Type: application/json in the response and in request if the API method is NOT GET

Common Responses

200: Successful Response. Response body varies w.r.t API 401: Unauthorized: The JWT token is missing or invalid 403: Forbidden : Not allowed to execute the concerned API 404: Entity Not Found 400: Bad Request (Error message varies w.r.t API) 201: No content: Empty Response

API Details

Visit the OpenAPI spec docs

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