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title: Finding Affected Builds in Nrwl Nx Monorepo
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title: Finding Affected Builds in Nrwl Nx Monorepo
date: '2021-01-24 00:00 +0000'
subtitle: Affected builds and project names in nx monorepo speed up your development and ci cd process
description: Affected builds and project names in nx monorepo speed up your development and ci cd process
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# Finding Affected Builds in Nrwl Nx Monorepo

![](https://i.imgur.com/JAdLwFG.jpg)
![](https://i.imgur.com/r6BwCaN.png)

> In this article, I will explain how to know which applications or libraries are changed in your [nx monorepo workspace](https://nx.dev). 


## First time building Nx Monorepo

First Time if you get the source from repo to your local machine and run 
 
 
 `npm run affected:build`
 
 Notice all of the applications and library projects will build. 
![](https://i.imgur.com/9Wi4QC3.png)

Once the build is done Nx  will remember which projects are compiled successfully. 

Next change the log.service.ts inside logger project in branding service. 

 ![](https://i.imgur.com/fnKoKcA.png)

## Affected Dependency Graph in Nx Monorepo

Next lets check the dependency graph to know which are the apps and libraries affected by our changes. 

Run `npm run affected:dep-graph`
![](https://i.imgur.com/e7bnd0Z.png)


See it is showing we have change `logger` project and it is being used in `customer-user-editor` and `onlinestore-admin` so all of these applications and projects are affected. 

![](https://i.imgur.com/NDhsfDS.png)

Nx can identify which are the projects changed. Which is great! 

## Build only Affected Projects in Nx Monorepo

Now you can run below script to just build affected projects only. 


Run `npm run affected:build`

Notice it is only building affected projects only. 

![](https://i.imgur.com/2EQaucL.png)


That give us performance while developing since we only build and test the projects that we change.



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