41

hello guys I have this next error when I try run my App from the terminal(linux), when I run this command:

ng serve

and I get this error in my terminal:

AppBlog/blog# ng serve An unhandled exception occurred: Cannot find module '@angular-devkit/build-angular/package.json' Require stack: - /usr/local/lib/node_modules/@angular/cli/node_modules/@angular-devkit/architect/node/node-modules-architect-host.js - /usr/local/lib/node_modules/@angular/cli/node_modules/@angular-devkit/architect/node/index.js - /usr/local/lib/node_modules/@angular/cli/models/architect-command.js - /usr/local/lib/node_modules/@angular/cli/commands/serve-impl.js - /usr/local/lib/node_modules/@angular/cli/node_modules/@angular-devkit/schematics/tools/export-ref.js - /usr/local/lib/node_modules/@angular/cli/node_modules/@angular-devkit/schematics/tools/index.js - /usr/local/lib/node_modules/@angular/cli/utilities/json-schema.js - /usr/local/lib/node_modules/@angular/cli/models/command-runner.js - /usr/local/lib/node_modules/@angular/cli/lib/cli/index.js - /usr/local/lib/node_modules/@angular/cli/lib/init.js - /usr/local/lib/node_modules/@angular/cli/bin/ng See "/tmp/ng-ev5aDi/angular-errors.log" for further details.

then i checked out this part :

An unhandled exception occurred: Cannot find module '@angular-devkit/build-angular/package.json'

this part say that cannot find moduled called: "'@angular-devkit/build-angular/package.json'"

then I cheked out this file in my project but I have this, look:

 "devDependencies": { "@angular-devkit/build-angular": "~0.900.3", "@angular/cli": "~9.0.3", "@angular/compiler-cli": "~9.0.2", "@angular/language-service": "~9.0.2", "@types/node": "^12.11.1", "@types/jasmine": "~3.5.0", "@types/jasminewd2": "~2.0.3", "codelyzer": "^5.1.2", "jasmine-core": "~3.5.0", "jasmine-spec-reporter": "~4.2.1", "karma": "~4.3.0", "karma-chrome-launcher": "~3.1.0", "karma-coverage-istanbul-reporter": "~2.1.0", "karma-jasmine": "~2.0.1", "karma-jasmine-html-reporter": "^1.4.2", "protractor": "~5.4.3", "ts-node": "~8.3.0", "tslint": "~5.18.0", "typescript": "~3.7.5" }

then i went to google and search and I found this like from stackoverflow and I tried their solution but it does not work and I run the command ng serve again.

what I did wrong?

before nothing , before I added 3 components: login,register and home in my folder : src/app with this command : ng generate component login and I import my component in my file : app.component.ts this way:

/* THIS IS JUST A EXAMPLE VERY SIMILAR TO MY CODE REAL, I just import one component*/ import { Component } from '@angular/core'; import { loginComponent } from './login.component'; @Component({ selector: 'app-root', templateUrl: './app.component.html', styleUrls: ['./app.component.css'], declarations: [loginComponent], //import my login }) export class AppComponent { title = 'blog'; }

maybe is this part but I dont find a solution, any expert in angular could tell me what I did wrong?

UPDATE

I am continue searching in google and I found this: github/Angular they are saying that I would install npm/angular-cli/node again and I run this command for update my angular cli:

uninstalled ang-cli

npm uninstall @angular/cli

installed the latest

npm install -g @angular/cli@latest

but first I update my npm with this command:

installed the latest npm

npm install -g npm@latest

but it still does not work.

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5
  • did you try reinstalling the module? Also downgrade to a version below and check Commented Feb 25, 2020 at 23:44
  • @prosper1 when I try update or reinstall the module with this next command : npm install --save-dev @angular-devkit/build-angular (stackoverflow.com/questions/59136899/…), I get this error or message i mean : npm install --save-dev @angular-devkit/build-angular Commented Feb 26, 2020 at 0:01
  • Did you tried to delete the folder "node_modules" and install all the dependencies other time with npm install --save? Commented Feb 26, 2020 at 9:38
  • The solution you describe in UPDATE worked for me. Commented Jun 8, 2020 at 7:09
  • you need to check the version of node. @angular/cli ~9.0.3 will only work with node ^10.13.0 || ^12.11.0 see: runebook.dev/ru/docs/angular/guide/versions Commented Jan 17, 2024 at 18:27

17 Answers 17

Reset to default
18

Please try installing the npm on a project folder. I had installed npm globally but installing the npm once again on a solution folder fixed my issue.

npm install in the project folder will do the trick. Then do ng serve -o

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3 Comments

npm install in the solution folder will do the trick. Then do ng serve -o
What does the '-o' do in the 'ng serve -o'?
@EvanSevy opens a browser to the app
14

I finally found something working for me.

Add --force at the end of your npm command.

Like npm install --save-dev @angular-devkit/build-angular --force

Then ng serve

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8

In my case these 2 commands helped:

npm install -g npm@latest npm install -g @angular/cli
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5

I have faced this issue when i recently upgraded the Angular CLI to Angular 9. the following commands fixed the issue.

npm install --save-dev @angular-devkit/build-angular npm install ng serve -o
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1 Comment

when i do that i get the below error npm ERR! Unexpected end of JSON input while parsing near '...@types/node/-/node-6.' npm ERR! A complete log of this run can be found in: npm ERR! C:\Users\rmahapatra\AppData\Roaming\npm-cache\_logs\2020-08-11T11_04_56_358Z-debug.log
4

If you are on Angular 11 and facing this issue then please do the following:

  1. Remove "@angular-devkit/build-ng-packagr:build" dependency from devDependencies

  2. Update angular.json->projects->your-library-name -> architect -> build ->

    Old:"builder": "@angular-devkit/build-ng-packagr:build",

    New:"builder": "@angular-devkit/build-angular:ng-packagr",

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2 Comments

I may be on an older version 9. But I used "@angular-devkit/build-ng-packagr:build" here and it worked. Thanks for the hint on the builder within angular.json
Thanks, finally to much scrolling to find this answer. Angular team, why not add this in the migrations?
2

In my case running npm install in project folder solved the problem.

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1

In my case 2 commands helped:

npm install --save-dev @angular-devkit/build-angular

npm install --save-dev @angular-devkit/core

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0

Under the project directory run the following command

npm install --save-dev @angular-devkit/build-angular
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0

The error states that "Cannot find module '@angular-devkit/build-angular/package.json'" which means you have to have that package added.

  1. install the latest npm

    npm install -g npm@latest

  2. add the missing

    npm install --save-dev @angular-devkit/build-angular

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0

Had this exact issue on an existing Angular 10 project. The following steps resolved the issue for me:

  1. Delete the package-lock.json file.
  2. Delete the node_modules folder and all of its contents.
  3. Run npm install. Note that in my case I had to add the --force flag. YMMV

At this point, ng build --prod completed successfully for me.

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0

I am Working Angular Project When I update Angular Cli and then I get this error An unhandled exception occurred: Cannot find module '@angular-devkit/build-angular/src/angular-cli-files/models/webpack-configs/utils' Require stack:

  • C:\codeFlies Development\how_marketsapp\node_modules@ionic\angular-toolkit\builders\utils\index.js
  • C:\codeFlies Development\how_marketsapp\node_modules@ionic\angular-toolkit\builders\cordova-build\index.js
  • C:\codeFlies Development\how_marketsapp\node_modules@angular-devkit\architect\node\node-modules-architect-host.js
  • C:\codeFlies Development\how_marketsapp\node_modules@angular-devkit\architect\node\index.js
  • C:\codeFlies Development\how_marketsapp\node_modules@angular\cli\models\architect-command.js
  • C:\codeFlies Development\how_marketsapp\node_modules@angular\cli\commands\run-impl.js
  • C:\codeFlies Development\how_marketsapp\node_modules@angular\cli\node_modules@angular-devkit\schematics\tools\export-ref.js
  • C:\codeFlies Development\how_marketsapp\node_modules@angular\cli\node_modules@angular-devkit\schematics\tools\index.js
  • C:\codeFlies Development\how_marketsapp\node_modules@angular\cli\utilities\json-schema.js
  • C:\codeFlies Development\how_marketsapp\node_modules@angular\cli\lib\cli\index.js
  • C:\codeFlies Development\how_marketsapp\node_modules@angular\cli\lib\init.js
  • C:\codeFlies Development\how_marketsapp\node_modules@angular\cli\bin\ng See "C:\Users\hp\AppData\Local\Temp\ng-UQJuET\angular-errors.log" for further details.

I have resolve this error by using this command

npm i @ionic/angular-toolkit@latest

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0

In my case I was getting a similar but different error.

Cannot find module '@nguniversal/builders/package.json'

To fix it I had to run

npm install --save-dev @nguniversal/builders
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0

I fixed it using:

npm i --save-dev @angular-devkit/build-angular --force npm i @angular/compiler-cli --save-dev
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0

Earlier following were errors:-

ng serve

Following worked for me: -

npm install npm@latest reinstall without -g

Packages installed successfully

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1 Comment

Please, try to avoid using images with code and errors, put it as code in your answer instead
0

I personally took 2 days to have a solution for this problem, that was after I upgraded my angular version.

npm install --save-dev @angular-devkit/build-angular --force

It saved my day!

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0

It also happened to me, when I ng serve on the cloned code on the company. This happens because there's an error with node modules installation so we need to install it again, build it, and serve it.

  1. npm install --save-dev @angular-devkit/build-angular
  2. ng build
  3. ng serve

If the first step above, didn't work because it didn't work to me and receives another error which is: "npm ERR! cb() never called!" I solve this using this command: npm cache clean --force and once this worked, continue to steps 2-3. It worked.

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-1

npm install run this in your terminal and done.

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