Tutorial example on how to build an application with LoopBack 4

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This is the basic tutorial for getting started with Loopback 4!


This tutorial demonstrates how to create a basic API for a todo list using LoopBack 4. You will experience how you can create REST APIs with just 5 steps.


First, you'll need to install a supported version of Node:

Additionally, this tutorial assumes that you are comfortable with certain technologies, languages and concepts.
  • JavaScript (ES6)
  • REST

Lastly, you'll need to install the LoopBack 4 CLI toolkit:
npm i -g @loopback/cli


To follow this tutorial, begin with the Create your app scaffolding section.


  1. Create your app scaffolding
  2. Add your Todo model
  3. Add a datasource
  4. Add a repository
  5. Add a controller
  6. Putting it all together
  7. Bonus:
[Integrate with a geo-coding service](http://loopback.io/doc/en/lb4/todo-tutorial-geocoding-service.html)

Try it out

If you'd like to see the final results of this tutorial as an example application, follow these steps:
  1. Run the lb4 example command to select and clone the todo repository:
lb4 example todo
  1. Switch to the directory.
cd loopback4-example-todo
  1. Finally, start the application!
$ npm start

Server is running at
Feel free to look around in the application's code to get a feel for how it works. If you're interested in learning how to build it step-by-step, then continue with this tutorial!

Need help?

Check out our Slack and ask for help with this tutorial.


Open an issue in loopback-next and we'll take a look.



Run npm test from the root folder.


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