Could not find module "@angular-devkit/build-angular"

After updating to Angular 6.0.1, I get the following error on ng serve:

Could not find module "@angular-devkit/build-angular" from "/home/Projects/myProjectName".
Error: Could not find module "@angular-devkit/build-angular" from "/home/Projects/myProjectName".
    at Object.resolve (/home/Projects/myProjectName/node_modules/@angular-devkit/core/node/resolve.js:141:11)
    at Observable.rxjs_1.Observable [as _subscribe] (/home/Projects/myProjectName/node_modules/@angular-devkit/architect/src/architect.js:132:40)

ng update says everything is in order. Deleting node_modules folder and a fresh npm install install did not help either.

My project is based on ng2-admin(Angular4 version). Here is my package.json dependecies:

 "dependencies": {
    "@angular/animations": "^6.0.1",
    "@angular/common": "^6.0.1",
    "@angular/compiler": "^6.0.1",
    "@angular/core": "^6.0.1",
    "@angular/forms": "^6.0.1",
    "@angular/http": "^6.0.1",
    "@angular/platform-browser": "^6.0.1",
    "@angular/platform-browser-dynamic": "^6.0.1",
    "@angular/platform-server": "^6.0.1",
    "@angular/router": "^6.0.1",
    "@ng-bootstrap/ng-bootstrap": "1.0.0-alpha.26",
    "@ngx-translate/core": "^10.0.1",
    "@ngx-translate/http-loader": "^3.0.1",
    "amcharts3": "github:amcharts/amcharts3",
    "ammap3": "github:amcharts/ammap3",
    "angular-table": "^1.0.4",
    "angular2-csv": "^0.2.5",
    "angular2-datatable": "0.6.0",
    "animate.css": "3.5.2",
    "bootstrap": "4.0.0-alpha.6",
    "bower": "^1.8.4",
    "chart.js": "1.1.1",
    "chartist": "0.10.1",
    "chroma-js": "1.3.3",
    "ckeditor": "4.6.2",
    "core-js": "2.4.1",
    "easy-pie-chart": "2.1.7",
    "font-awesome": "4.7.0",
    "fullcalendar": "3.3.1",
    "google-maps": "3.2.1",
    "ionicons": "2.0.1",
    "jquery": "3.2.1",
    "jquery-slimscroll": "1.3.8",
    "leaflet": "0.7.7",
    "leaflet-map": "0.2.1",
    "lodash": "4.17.4",
    "ng2-ckeditor": "1.1.6",
    "ng2-completer": "^1.6.3",
    "ng2-handsontable": "^2.1.0-rc.3",
    "ng2-slim-loading-bar": "^4.0.0",
    "ng2-smart-table": "^1.0.3",
    "ng2-tree": "2.0.0-alpha.5",
    "ngx-uploader": "4.2.4",
    "normalize.css": "6.0.0",
    "roboto-fontface": "0.7.0",
    "rxjs": "^6.1.0",
    "rxjs-compat": "^6.1.0",
    "zone.js": "0.8.26"
  },
  "devDependencies": {
    "@angular/cli": "^6.0.1",
    "@angular/compiler-cli": "^6.0.1",
    "@types/fullcalendar": "2.7.40",
    "@types/jasmine": "2.5.38",
    "@types/jquery": "2.0.41",
    "@types/jquery.slimscroll": "1.3.30",
    "@types/lodash": "4.14.61",
    "@types/node": "6.0.69",
    "codelyzer": "3.0.1",
    "gh-pages": "0.12.0",
    "jasmine-core": "2.5.2",
    "jasmine-spec-reporter": "3.2.0",
    "karma": "1.4.1",
    "karma-chrome-launcher": "2.0.0",
    "karma-cli": "1.0.1",
    "karma-coverage-istanbul-reporter": "0.2.0",
    "karma-jasmine": "1.1.0",
    "karma-jasmine-html-reporter": "0.2.2",
    "npm-run-all": "4.0.2",
    "protractor": "5.1.0",
    "rimraf": "2.6.1",
    "standard-changelog": "1.0.1",
    "stylelint": "7.10.1",
    "ts-node": "2.1.2",
    "tslint": "5.2.0",
    "tslint-eslint-rules": "4.0.0",
    "tslint-language-service": "0.9.6",
    "typescript": "^2.7.2",
    "typogr": "0.6.6",
    "underscore": "1.8.3",
    "wintersmith": "2.2.5",
    "wintersmith-sassy": "1.1.0"
  }

and my angular.json:

{
  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
  "version": 1,
  "newProjectRoot": "projects",
  "projects": {
    "ng2-admin": {
      "root": "",
      "sourceRoot": "src",
      "projectType": "application",
      "architect": {
        "build": {
          "builder": "@angular-devkit/build-angular:browser",
          "options": {
            "outputPath": "dist",
            "index": "src/index.html",
            "main": "src/main.ts",
            "tsConfig": "src/tsconfig.app.json",
            "polyfills": "src/polyfills.ts",
            "assets": [
              "src/assets",
              "src/favicon.ico"
            ],
            "styles": [
              "node_modules/roboto-fontface/css/roboto/sass/roboto-fontface.scss",
              "node_modules/normalize.css/normalize.css",
              "node_modules/font-awesome/scss/font-awesome.scss",
              "node_modules/ionicons/scss/ionicons.scss",
              "node_modules/bootstrap/scss/bootstrap.scss",
              "node_modules/leaflet/dist/leaflet.css",
              "node_modules/chartist/dist/chartist.css",
              "node_modules/fullcalendar/dist/fullcalendar.css",
              "node_modules/handsontable/dist/handsontable.full.css",
              "node_modules/ng2-slim-loading-bar/style.css",
              "src/app/theme/theme.scss",
              "src/styles.scss"
            ],
            "scripts": [
              "node_modules/jquery/dist/jquery.js",
              "node_modules/easy-pie-chart/dist/jquery.easypiechart.js",
              "node_modules/jquery-slimscroll/jquery.slimscroll.js",
              "node_modules/tether/dist/js/tether.js",
              "node_modules/bootstrap/dist/js/bootstrap.js",
              "node_modules/handsontable/dist/handsontable.full.js",
              "node_modules/chroma-js/chroma.js"
            ]
          },
          "configurations": {
            "production": {
              "optimization": true,
              "outputHashing": "all",
              "sourceMap": false,
              "extractCss": true,
              "namedChunks": false,
              "aot": true,
              "extractLicenses": true,
              "vendorChunk": false,
              "buildOptimizer": true,
              "fileReplacements": [
                {
                  "replace": "src/environments/environment.ts",
                  "with": "src/environments/environment.prod.ts"
                }
              ]
            }
          }
        },
        "serve": {
          "builder": "@angular-devkit/build-angular:dev-server",
          "options": {
            "browserTarget": "ng2-admin:build"
          },
          "configurations": {
            "production": {
              "browserTarget": "ng2-admin:build:production"
            }
          }
        },
        "extract-i18n": {
          "builder": "@angular-devkit/build-angular:extract-i18n",
          "options": {
            "browserTarget": "ng2-admin:build"
          }
        },
        "test": {
          "builder": "@angular-devkit/build-angular:karma",
          "options": {
            "main": "src/test.ts",
            "karmaConfig": "./karma.conf.js",
            "polyfills": "src/polyfills.ts",
            "tsConfig": "src/tsconfig.spec.json",
            "scripts": [
              "node_modules/jquery/dist/jquery.js",
              "node_modules/easy-pie-chart/dist/jquery.easypiechart.js",
              "node_modules/jquery-slimscroll/jquery.slimscroll.js",
              "node_modules/tether/dist/js/tether.js",
              "node_modules/bootstrap/dist/js/bootstrap.js",
              "node_modules/handsontable/dist/handsontable.full.js",
              "node_modules/chroma-js/chroma.js"
            ],
            "styles": [
              "node_modules/roboto-fontface/css/roboto/sass/roboto-fontface.scss",
              "node_modules/normalize.css/normalize.css",
              "node_modules/font-awesome/scss/font-awesome.scss",
              "node_modules/ionicons/scss/ionicons.scss",
              "node_modules/bootstrap/scss/bootstrap.scss",
              "node_modules/leaflet/dist/leaflet.css",
              "node_modules/chartist/dist/chartist.css",
              "node_modules/fullcalendar/dist/fullcalendar.css",
              "node_modules/handsontable/dist/handsontable.full.css",
              "node_modules/ng2-slim-loading-bar/style.css",
              "src/app/theme/theme.scss",
              "src/styles.scss"
            ],
            "assets": [
              "src/assets",
              "src/favicon.ico"
            ]
          }
        },
        "lint": {
          "builder": "@angular-devkit/build-angular:tslint",
          "options": {
            "tsConfig": [
              "src/tsconfig.app.json",
              "src/tsconfig.spec.json"
            ],
            "exclude": []
          }
        }
      }
    },
    "ng2-admin-e2e": {
      "root": "",
      "sourceRoot": "",
      "projectType": "application",
      "architect": {
        "e2e": {
          "builder": "@angular-devkit/build-angular:protractor",
          "options": {
            "protractorConfig": "./protractor.conf.js",
            "devServerTarget": "ng2-admin:serve"
          }
        },
        "lint": {
          "builder": "@angular-devkit/build-angular:tslint",
          "options": {
            "tsConfig": [
              "e2e/tsconfig.e2e.json"
            ],
            "exclude": []
          }
        }
      }
    }
  },
  "defaultProject": "ng2-admin",
  "schematics": {
    "@schematics/angular:component": {
      "prefix": "app",
      "styleext": "scss"
    },
    "@schematics/angular:directive": {
      "prefix": "app"
    }
  }
}

Install @angular-devkit/build-angular as dev dependency. This package is newly introduced in Angular 6.0

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

or,

yarn add @angular-devkit/build-angular --dev

npm update

It worked like a charm.

for angular 6 and above

The working solution for me was

npm install

ng update

and finally

npm update

Need to explicitly get devDependencies.

npm i --only=dev

If the following command does not work,

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

then move to the project folder and run this command:

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

I fixed mine by:

1. Delete node_modules folder.

2. run npm install

Hope this helped!

All of the above answer are correct but they did not work for me. The only way I was able to make this work was by follow steps/commands:

npm uninstall -g @angular/cli@6.0.8
npm cache clean --force
npm install -g @angular/cli@latest
npm install node-sass -g
ng new MY_PROJECT_NAME
cp -r from_my_old_project to_new_MY_PROJECT_NAME

Please follow these 5 steps,it's worked definitely. (My personal experience)

Step 1: npm uninstall -g @angular/cli

Step 2: npm cache clean --force

Step 3: npm install -g @angular/cli@latest

Step 4: npm i

Step 5: ng build

After that ng serve .I hope definitely your problem will be solved.

For Angular 8

Install npm-check-updates package

Run:

$ npm i npm-check-updates
$ ncu -u
$ npm install

This package will update all packages and resolve this issue

Notice: After update If you face this issue:

> ERROR in The Angular Compiler requires TypeScript >=3.4.0 and <3.6.0 > but 3.6.3 was found instead.

then run:

$ npm install typescript@3.5.3

Source Link

npm install Just type npm install and run.Then the project will run without errors. Or you can use npm install --save-dev @angular-devkit/build-angular

Try this one.

npm install

npm update

if it's shows something like this. 

> run npm audit fix to fix them, or npm audit for details

Do that!

The following worked for me. Nothing else did, unfortunately.

npm uninstall @angular-devkit/build-angular
npm install @angular-devkit/build-angular
ng update --all --allow-dirty --force

Following commands works:

npm install
ng update

-You may see the message "We analyzed your package.json and everything seems to be in order. Good work!"

npm update

Then try dev build

ng build 

I got the error with type script, downgraded to

npm install typescript@">=3.1.1 <3.2

ng build --prod 

All success with prod build.

Below is the working combination

ng --version

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.11.0
@angular-devkit/build-angular     0.11.0
@angular-devkit/build-optimizer   0.11.0
@angular-devkit/build-webpack     0.11.0
@angular-devkit/core              7.1.0
@angular-devkit/schematics        7.1.0
@angular/cli                      7.1.0
@ngtools/webpack                  7.1.0
@schematics/angular               7.1.0
@schematics/update                0.11.0
rxjs                              6.3.3
typescript                        3.1.6
webpack                           4.23.1

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

solved it for me.

First delete node_modules folder

then Restart system

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

and

Run npm install

When we run commands like ng serve, it uses the local version of @angular/cli. So first install latest version of @angular/cli locally (without the -g flag). Then update the cli using ng update @angular/cli command. I thing this should fix the issue. Thanks

This link may help you if you are updating your angular project https://update.angular.io/

This error generally occurs when the angular project was not configure completely.

This will work

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

npm install

Just execute the following command and error was solved

• ng update @angular/cli @angular/core

• npm uninstall @angular-devkit/build-angular

• npm install --save-dev @angular-devkit/build-angular ###if this error could not resolve by above command so you update node version###

• npm update npm -g

working solution for me

Delete node_modules folder.

run npm install

Hope this will work!

I struggled with the same problem just a minute ago. My project was generated using the v 1.6.0 of angular-cli.

1. npm update -g @angular/cli

2. editing my package.json changing the line
    "@angular/cli": "1.6.0",
      to
    "@angular/cli": "^1.6.0",

3. npm update

I hope my help is effective ツ

Try this first

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

If some error come again for missing packages try

npm install

That's works for me, commit and then:

ng update @angular/cli @angular/core
npm install --save-dev @angular/cli@latest

I had the same problem today, after upgrading node from v9 to v10.
My environment is set by docker and I had to remove this command from the my DockerFile :

npm link @angular/cli

It creates a symlink to the directory where node is installed.
I guess the angular/cli module in it do not have the same version as the one in the node_modules dir of my project, and this causes the issue.

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

This code install @angular-devkit/build-angular as dev dependency.

100% TESTED.

I had a library which I created in an older version of Angular.

Now that I upgraded to the latest version 11 the build would fail.

Indeed, the builder has changed.

When doing an ng build I was something a somewhat similar error message:

Cannot find module '@angular-devkit/build-ng-packagr/package.json'

In the angular.json file I had to change the builder property:

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

with:

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

• Delete the node_modules.
• Clear the cache using npm cache clean --verify.
• And then npm install again.

Works like a charm for me.

I faced the same problem.

Surprisingly, it was just because the version specified in package.json was not in the expected format.

I switched from version "version": "0.1" to "version": "0.0.1" and it solved the problem.

Angular NEEDS semantic versioning (also read Semver) with three parts.

Just update the angular version and add the below dependency:

ng update

npm update

npm i @angular-devkit/build-angular

https://www.npmjs.com/package/@angular-devkit/build-angular

I am facing the same issue since 2 days.

ng -v :6.0.8
node -v :8.11.2
npm -v :6.1.0

Make sure you are in the folder where angular.json is installed. Get into that and type ng serve. If the issue still arises, then you are having only dependencies installed in node_modules. Type the following, and it will work:

npm i --only=dev

Unfortunately, none of the provided solutions worked perfectly for me, but grepit's answer inspired me to do the following steps. I uninstalled node.js via my OS (Windows 10) and installed it again. Then installed Angular CLI. Then created a new project, and copied my old project's src file into this new one and the error's gone.

Here are the instructions:

1. Uninstall node.js via your OS and install it again
2. npm install -g @angular/cli
3. Rename your project to YOUR_PROJECT_NAME.old
4. ng new YOUR_PROJECT_NAME
5. Run this hello world project (ng serve) to make sure that you won't get the error.
6. xcopy YOUR_PROJECT_NAME.old\src\*.* YOUR_PROJECT_NAME\src /s
   This is Windows version of copy, change it based on your own OS.

I had the problem with the newest version of @angular-devkit/build-angular (as of writing this, 11.0.5 was only released 17 hours ago).

Our Company is using a Nexus Repository Manager as a npm registry (we do not access https://registry.npmjs.org/ directly), the version was so new, that it wasn't included yet in our Nexus yet.

Invalidating the cache of the repository and npm install fixed the issue.

From the ionic forum this worked for me.

npm i @ionic/angular-toolkit@latest

1. go to the folder where u created the angular project and the delete the node_modules folder.

2. Now open the command prompt and enter in the project which u want to run using cd.

3. Enter the command

npm i
OR
npm install

4. Now the command prompt will start installing the new node_modules files in the project.

5. When the node_modules gets installed then, run the project using command

ng s --o

If the above method not worked then their is some mismatch of the version in npm and then try to install the node_modules.

npm update

Generally this method should work if not worked then try to run this command:

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

Details and alternative solution https://learnprogramo.com/could-not-find-module-angular-devkit-build-angular-resolved/

running the following worked for me npm audit fix --force

Delete package-lock.json and do npm install again. It should fix the issue.

** This fix is more suitable when you have created Angular 6 app using ng new and after installing other dependencies you find this error.

In my case, the issue is, because of missing dependencies. The dependencies are missing, because I've forgotten to call:

npm install

After calling the above command, all required dependencies are loaded in node_modules, and that is no more issue

Execute below Command on your CLI :

• npm install

Try this. It worked for me

npm uninstall -g @angular/cli
npm cache verify
npm install -g @angular/cli@next

I try all the answers above, but none of them work to me. I had to downgrade the version of Angular-CLI. I run the command ng --version and results:

@angular-devkit/architect          0.10.7
@angular-devkit/build-angular      0.10.7
@angular-devkit/build-ng-packagr   0.10.7
@angular-devkit/build-optimizer    0.10.7
@angular-devkit/build-webpack      0.10.7
@angular-devkit/core               7.0.7 <-- notice this!
@angular-devkit/schematics         8.2.1
@angular/cli                       8.2.1 <-- and this!
@ngtools/json-schema               1.1.0
@ngtools/webpack                   7.0.7
@schematics/angular                8.2.1
@schematics/update                 0.802.1
ng-packagr                         4.7.1
rxjs                               6.3.3
typescript                         3.1.6
webpack                            4.19.1

I open my package.json and search for the line that define the version of CLI:

...
"devDependencies": {
    "@angular-devkit/build-angular": "~0.10.0",
    "@angular-devkit/build-ng-packagr": "~0.10.0",
    "@angular/cli": "~8.2.0" -- I changed here to ~7.0.7
...}
...

I change the version of @angular/cli to ~7.0.7. Then run npm uninstall @angular/cli and install again running npm install -g angular-cli@~7.0.7

I resolved this by installing Angular on a 64 bit operating system. I was getting the error because I was initially running it on a 32 bit OS

with the help of below commands your application will work as you aspected run each command as I mention

 1.npm list -g --depth=0
 2.npm i npm-check-updates
 3.npm install

and finally, run the below command to open your project in browser

ng serve --open

I didn't have a package.json. Make sure you have one.

Try all these 3.

NOTE : Do it inside the project folder :

npm install
ng update
npm update

For me, it got worked when I ran the npm install command inside the project folder. Ex: I have shoppingmenu app and I ran the npm install command inside that folder.

I just did below and it worked.

npm install --save-dev

you npm version is old, try to run the following command:

npm i npm@latest -g