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Could not find module “@angular-devkit/build-angular”

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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"
    }
  }
}

44 Answers

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

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/[email protected]
npm cache clean --force
npm install -g @angular/[email protected]
npm install node-sass -g
ng new MY_PROJECT_NAME
cp -r from_my_old_project to_new_MY_PROJECT_NAME

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 [email protected]

Source Link

I fixed mine by:

  1. Delete node_modules folder.

  2. run npm install

Hope this helped!

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

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

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/[email protected]

Step 4: npm i

Step 5: ng build

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

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!

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 [email protected]">=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/[email protected]

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/

I had the same issue with Angular 7. Just executed the following command and error was solved.

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

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

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/[email protected]

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.

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.oldsrc*.* YOUR_PROJECT_NAMEsrc /s
    This is Windows version of copy, change it based on your own OS.

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

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

add @angular-devkit/build-angular under your dev dependency and it will work, or you can also execute

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

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.

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