Page Contents


Adds a new DataSource class and config files to a LoopBack application.

lb4 datasource [options] [<name>]


--connector : Name of datasource connector

This can be a connector supported by LoopBack / Community / Custom.

Standard options

-h, --help
Print the generator’s options and usage.
Do not remember prompt answers. Default is false.
Do not automatically install dependencies. Default is false.
-c, --config
JSON file name or value to configure options
Format generated code using npm run lint:fix

For example,

lb4 app --config config.json
lb4 app --config '{"name":"my-app"}'
cat config.json | lb4 app --config stdin
lb4 app --config stdin < config.json
lb4 app --config stdin << EOF
> {"name":"my-app"}
-y, --yes
Skip all confirmation prompts with default or provided value


<name> - Required name of the datasource to create as an argument to the command. If provided, the tool will use that as the default when it prompts for the name.

Interactive Prompts

The tool will prompt you for:

  • Name of the datasource. (dataSourceName) If the name had been supplied from the command line, the prompt is skipped and the datasource is built with the name from the command-line argument.
  • Name of connector. If not supplied via command line, you will be presented with a list of connector to select from (including an other option for custom connector).
  • Connector configuration. If the connector is not a custom connector, the CLI will prompt for the connector configuration information.


Once all the prompts have been answered, the CLI will do the following:

  • Install @loopback/repository and the connector package (if it’s not a custom connector).
  • Create a file with the connector configuration as follows: /src/datasources/${dataSource.dataSourceName}.datasource.config.json
  • Create a DataSource class which recieves the connector config using Dependency Injection as follows: /src/datasources/${dataSource.dataSourceName}.datasource.ts
  • Update /src/datasources/index.ts to export the newly created DataSource class.