Create a launch.json file in the .vscode folder

 folder to configure debugging settings specifically for your Nest.js application. This file allows you to set breakpoints and inspect variables directly in the Visual Studio Code editor, enhancing your development experience. Utilizing a 

 aligns with the software engineering principle of "Configuration as Code," making your development environment easily reproducible and version-controllable.

---
title: Debug Nestjs Application
privateVideoUrl: https://fullstack.wistia.com/medias/1o02vu8zxl
isPublicLesson: true
---

### Create a launch.json file in the .vscode folder

Create a `launch.json` file in the `.vscode` folder to configure debugging settings specifically for your Nest.js application. This file allows you to set breakpoints and inspect variables directly in the Visual Studio Code editor, enhancing your development experience. Utilizing a `launch.json` aligns with the software engineering principle of "Configuration as Code," making your development environment easily reproducible and version-controllable.

Haider Malik

Debug Nestjs Application

In this lesson, I'm going to teach you how to debug NestJS application using VS

If you don't have lost.json file in .vs code folder, you can create it.

If you go to the debug, I'm going to create a new folder .vs code and you can

So I have to start the application in debug mode.

NestJS has a script in package.json file.

Now you can start the application by running npm start run start debug.

You can see that our debugger has started.

When you go to the debug, now you have to attach it.

I have request body, request client, request.user.

You can also watch on a specific property, request.user.

You can see that I got the API key, email, enable to FA to FA secret.

This is a great way to debug the application.

You can find errors very easily by using debugging.

If you want to debug the complete flow, you can do that into the app strategy.

What I was API, API key strategy or API strategy.

Let me put the breakpoint here and I would like to put the breakpoint here.

You can see that it has first called this validate method.

It is going to find the user on the base on API key.

Now it is going to execute this line return user.

It has now it has added the request.user.

You have returned API user from the API key strategy like this one.

SJS has stored user inside the request object like request.user like this one.

If you need to step into a specific function, you have to use this one step int

If you want to go out from this function, you can press step out.

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