Error: Schema validation failed with the following errors: Data path "" should NOT have additional properties(project)

After migrating application from angular 5 to 6, on running ng serve the following errors pop up.

> Schema validation failed with the following errors: Data path "" should NOT have additional properties(project). Error: Schema validation failed with the following errors: Data path "" should NOT have additional properties(project). at MergeMapSubscriber._registry.compile.pipe.operators_1.concatMap.validatorResult [as project] (.../TemplateApp/me-cmf-web-template-angular/node_modules/@angular-devkit/core/src/workspace/workspace.js:210:42) at MergeMapSubscriber._tryNext (/.../me-cmf-web-template-angular/node_modules/@angular-devkit/core/node_modules/rxjs/internal/operators/mergeMap.js:65:27) at MergeMapSubscriber._next (.../me-cmf-web-template-angular/node_modules/@angular-devkit/core/node_modules/rxjs/internal/operators/mergeMap.js:55:18) at MergeMapSubscriber.Subscriber.next (/home/training/Attinad_Projects/TemplateApp/me-cmf-web-template-angular/node_modules/@angular-devkit/core/node_modules/rxjs/internal/Subscriber.js:64:18) at MergeMapSubscriber.notifyNext (.../TemplateApp/me-cmf-web-template-angular/node_modules/@angular-devkit/core/node_modules/rxjs/internal/operators/mergeMap.js:84:26) at InnerSubscriber._next (.../me-cmf-web-template-angular/node_modules/@angular-devkit/core/node_modules/rxjs/internal/InnerSubscriber.js:25:21) at InnerSubscriber.Subscriber.next (/.../me-cmf-web-template-angular/node_modules/@angular-devkit/core/node_modules/rxjs/internal/Subscriber.js:64:18) at MapSubscriber._next (.../me-cmf-web-template-angular/node_modules/@angular-devkit/core/node_modules/rxjs/internal/operators/map.js:52:26) at MapSubscriber.Subscriber.next (/.../me-cmf-web-template-angular/node_modules/@angular-devkit/core/node_modules/rxjs/internal/Subscriber.js:64:18) at SwitchMapSubscriber.notifyNext (.../me-cmf-web-template-angular/node_modules/@angular-devkit/core/node_modules/rxjs/internal/operators/switchMap.js:77:26)

I assume that the error is with .angular.json file which I re-named from .angular-cli.json .

My .angular.json file is as follows :

{
    "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
    "project": {
        "name": "mediaweb"
    },
    "apps": [{
            "root": "src",
            "outDir": "dist/browser",
            "assets": [
                "assets",
                "favicon.ico"
            ],
            "index": "index.html",
            "main": "main.ts",
            "polyfills": "polyfills.ts",
            "test": "test.ts",
            "tsconfig": "tsconfig.app.json",
            "testTsconfig": "tsconfig.spec.json",
            "prefix": "app",
            "styles": [
                "styles.scss",
                "../node_modules/owl.carousel/dist/assets/owl.carousel.css",
                "../node_modules/owl.carousel/dist/assets/owl.theme.default.css",
                "../node_modules/video.js/dist/video-js.css"
            ],
            "scripts": [
                "../node_modules/jquery/dist/jquery.js",
                "../node_modules/owl.carousel/dist/owl.carousel.js",
                "../node_modules/video.js/dist/ie8/videojs-ie8.js",
                "../node_modules/video.js/dist/video.js"
            ],
            "environmentSource": "environments/environment.ts",
            "environments": {
                "dev": "environments/environment.dev.ts",
                "prod": "environments/environment.prod.ts"
            }
        },
        {
            "platform": "server",
            "root": "src",
            "outDir": "dist/server",
            "assets": [
                "assets",
                "favicon.ico"
            ],
            "index": "index.html",
            "main": "main.server.ts",
            "test": "test.ts",
            "tsconfig": "tsconfig.server.json",
            "testTsconfig": "tsconfig.spec.json",
            "prefix": "app",
            "styles": [
                "styles.scss"
            ],
            "scripts": [],
            "environmentSource": "environments/environment.ts",
            "environments": {
                "dev": "environments/environment.dev.ts",
                "prod": "environments/environment.prod.ts"
            }
        }
    ],
    "e2e": {
        "protractor": {
            "config": "./protractor.conf.js"
        }
    },
    "lint": [{
            "project": "src/tsconfig.app.json",
            "exclude": ["**/node_modules/**", "**/UI/**"]
        },
        {
            "project": "src/tsconfig.spec.json",
            "exclude": "**/node_modules/**"
        },
        {
            "project": "e2e/tsconfig.e2e.json",
            "exclude": "**/node_modules/**"
        }
    ],
    "test": {
        "karma": {
            "config": "./karma.conf.js"
        }
    },
    "defaults": {
        "styleExt": "scss",
        "component": {}
    }
}

Should I re-structure the json file, if so how?.

Any help would be great.

The issue is generally because of a version mismatch in your package.json file.

In my Angular 7 app, I have changed "@angular-devkit/build-angular": "^0.800.2" to "@angular-devkit/build-angular": "~0.7.0".

Then I ran the command npm install after deleting node_modules.

Aside: Use ^ carefully. Your working code may not work in the future if there is a major change in the package used.

my app is on angular 7.2.3

remove "es5BrowserSupport": true from angular.json. and npm start now works.

When i was getting version error issues,Following command worked for me:

First run:

npm update

Second run:

ng update

Third run: (It will update all the mismatching packages)

ng update --all --force

First:

npm uninstall @angular-devkit/build-angular

Next:

npm install @angular-devkit/build-angular@0.12.4

Angular Upgrade from 9 to 10 is very easy (all additional detail-information is here: https://update.angular.io/?v=9.0-10.0) :

> Make sure your package file is in version control and all changes have been committed. This will overwrite your package file. Better you try it in a new experimental branch.

npm install -g npm-check-updates
ncu -u
ng update --all --force

In the new schema, it is no longer allowed to use the key es5BrowserSupport; remove the following line in your angular.json:

"es5BrowserSupport": true

then simply start your application anew:

npm start

Change package.json from:

"@angular-devkit/build-angular": "^0.13.5",

to:

"@angular-devkit/build-angular": "^0.12.1",

Since I fixed the issue I thought it would be nice to post it here.

I changed my file name .angular.json to angular.json and replaced some properties from the question in it.

{
  "$schema": "./node_modules/@angular-devkit/core/src/workspace/workspace-schema.json",
  "version": 1,
  "newProjectRoot": "projects",
  "projects": {
    "template-appv6": {
      "root": "",
      "projectType": "application",
      "architect": {
        "build": {
          "builder": "@angular-devkit/build-angular:browser",
          "options": {
            "outputPath": "dist/browser",
            "index": "src/index.html",
            "main": "src/main.ts",
            "tsConfig": "src/tsconfig.app.json",
            "polyfills": "src/polyfills.ts",
            "assets": [
              {
                "glob": "**/*",
                "input": "src/assets",
                "output": "/assets"
              },
              {
                "glob": "favicon.ico",
                "input": "src",
                "output": "/"
              }
            ],
            "styles": [
              "src/styles.scss"
            ],
            "scripts": []
          },
          "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": "template-appv6:build"
          },
          "configurations": {
            "production": {
              "browserTarget": "template-appv6:build:production"
            }
          }
        },
        "extract-i18n": {
          "builder": "@angular-devkit/build-angular:extract-i18n",
          "options": {
            "browserTarget": "template-appv6: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": [],
            "styles": [
              "src/styles.css"
            ],
            "assets": [
              {
                "glob": "**/*",
                "input": "src/assets",
                "output": "/assets"
              },
              {
                "glob": "favicon.ico",
                "input": "src",
                "output": "/"
              }
            ]
          }
        },
        "lint": {
          "builder": "@angular-devkit/build-angular:tslint",
          "options": {
            "tsConfig": [
              "src/tsconfig.app.json",
              "src/tsconfig.spec.json"
            ],
            "exclude": [
              "**/node_modules/**"
            ]
          }
        },
        "server": {
          "builder": "@angular-devkit/build-angular:server",
          "options": {
            "outputPath": "dist/server",
            "main": "src/main.server.ts",
            "tsConfig": "src/tsconfig.server.json"
          }
        }
      }
    },
    "template-appv6-e2e": {
      "root": "",
      "projectType": "application",
      "cli": {},
      "schematics": {},
      "architect": {
        "e2e": {
          "builder": "@angular-devkit/build-angular:protractor",
          "options": {
            "protractorConfig": "./protractor.conf.js",
            "devServerTarget": "template-appv6:serve"
          }
        },
        "lint": {
          "builder": "@angular-devkit/build-angular:tslint",
          "options": {
            "tsConfig": [
              "e2e/tsconfig.e2e.json"
            ],
            "exclude": [
              "**/node_modules/**"
            ]
          }
        }
      }
    }
  },
  "cli": {},
  "schematics": {
    "@schematics/angular:component": {
      "prefix": "app",
      "styleext": "css"
    },
    "@schematics/angular:directive": {
      "prefix": "app"
    }
  }
}

I changed the file by replacing the angular.json file with properties in the angular official docs.

The official Angular Update Guide provides a step by step guide on how to update versions.

just go to the angular.json file and remove

> "extractCss": true

on the

> production section.

the format of angular.json needs to be as per Angular6... You can check my angular.json below or create a new project in Angular6 and then check the format of the 'project' head

{
  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
  "version": 1,
  "newProjectRoot": "projects",
  "projects": {
    "homePage6": {
      "root": "",
      "sourceRoot": "src",
      "projectType": "application",
      "prefix": "app",
      "schematics": {
        "@schematics/angular:component": {
          "styleext": "scss"
        }
      },
      "architect": {
        "build": {
          "builder": "@angular-devkit/build-angular:browser",
          "options": {
            "outputPath": "dist/homePage6",
            "index": "src/index.html",
            "main": "src/main.ts",
            "polyfills": "src/polyfills.ts",
            "tsConfig": "src/tsconfig.app.json",
            "assets": [
              "src/favicon.ico",
              "src/assets",
              "src/manifest.json"
            ],
            "styles": [
              "src/styles.scss"
            ],
            "scripts": []
          },
          "configurations": {
            "production": {
              "fileReplacements": [
                {
                  "replace": "src/environments/environment.ts",
                  "with": "src/environments/environment.prod.ts"
                }
              ],
              "optimization": true,
              "outputHashing": "all",
              "sourceMap": false,
              "extractCss": true,
              "namedChunks": false,
              "aot": true,
              "extractLicenses": true,
              "vendorChunk": false,
              "buildOptimizer": true,
              "serviceWorker": true
            }
          }
        },
        "serve": {
          "builder": "@angular-devkit/build-angular:dev-server",
          "options": {
            "browserTarget": "homePage6:build"
          },
          "configurations": {
            "production": {
              "browserTarget": "homePage6:build:production"
            }
          }
        },
        "extract-i18n": {
          "builder": "@angular-devkit/build-angular:extract-i18n",
          "options": {
            "browserTarget": "homePage6:build"
          }
        },
        "test": {
          "builder": "@angular-devkit/build-angular:karma",
          "options": {
            "main": "src/test.ts",
            "polyfills": "src/polyfills.ts",
            "tsConfig": "src/tsconfig.spec.json",
            "karmaConfig": "src/karma.conf.js",
            "styles": [
              "styles.scss"
            ],
            "scripts": [],
            "assets": [
              "src/favicon.ico",
              "src/assets",
              "src/manifest.json"
            ]
          }
        },
        "lint": {
          "builder": "@angular-devkit/build-angular:tslint",
          "options": {
            "tsConfig": [
              "src/tsconfig.app.json",
              "src/tsconfig.spec.json"
            ],
            "exclude": [
              "**/node_modules/**"
            ]
          }
        }
      }
    },
    "homePage6-e2e": {
      "root": "e2e/",
      "projectType": "application",
      "architect": {
        "e2e": {
          "builder": "@angular-devkit/build-angular:protractor",
          "options": {
            "protractorConfig": "e2e/protractor.conf.js",
            "devServerTarget": "homePage6:serve"
          }
        },
        "lint": {
          "builder": "@angular-devkit/build-angular:tslint",
          "options": {
            "tsConfig": "e2e/tsconfig.e2e.json",
            "exclude": [
              "**/node_modules/**"
            ]
          }
        }
      }
    }
  },
  "defaultProject": "homePage6"
}

I ran into similar (not identical, but also in angular.json) issue:

> Schema validation failed with the following errors: Data path > "['server']" should NOT have additional properties(scripts). Error: > Schema validation failed with the following errors: Data path > "['server']" should NOT have additional properties(scripts). > at MergeMapSubscriber._registry.compile.pipe.operators_1.concatMap.validatorResult > [as project] > (D:\Angular7\uHome\node_modules@angular-devkit\core\src\workspace\workspace.js:215:42) > at MergeMapSubscriber._tryNext (D:\Angular7\uHome\node_modules\rxjs\internal\operators\mergeMap.js:69:27) > at MergeMapSubscriber._next (D:\Angular7\uHome\node_modules\rxjs\internal\operators\mergeMap.js:59:18) > at MergeMapSubscriber.Subscriber.next (D:\Angular7\uHome\node_modules\rxjs\internal\Subscriber.js:67:18) > at MergeMapSubscriber.notifyNext (D:\Angular7\uHome\node_modules\rxjs\internal\operators\mergeMap.js:92:26) > at InnerSubscriber._next (D:\Angular7\uHome\node_modules\rxjs\internal\InnerSubscriber.js:28:21) > at InnerSubscriber.Subscriber.next (D:\Angular7\uHome\node_modules\rxjs\internal\Subscriber.js:67:18) > at MapSubscriber._next (D:\Angular7\uHome\node_modules\rxjs\internal\operators\map.js:55:26) > at MapSubscriber.Subscriber.next (D:\Angular7\uHome\node_modules\rxjs\internal\Subscriber.js:67:18) > at SwitchMapSubscriber.notifyNext (D:\Angular7\uHome\node_modules\rxjs\internal\operators\switchMap.js:86:26)

had to remove the property scripts from my angular.json... sharing this information to help someone in the future.

Updating npm and angular fixed mine:

Assuming you use npm

npm update

then run:

ng update

NB: You might be prompted to update individual dependencies. In my case, I was prompted to run:

ng update @angular/cli and ng update @angular/core.

When upgrading Angular from version 8 to 10 I got very similar error, namely Schema validation failed with the following errors: Data path "" should NOT have additional properties(serverTarget)..

The solution was remove all "serverTarget" references from below "serve". The below was wrong:

"serve": {
  "builder": "@angular-devkit/build-angular:dev-server",
  "options": {
    "browserTarget": "my_app:build"
    "serverTarget": "my_app:server"
  },
  "configurations": {
    "production": {
      "browserTarget": "my_app:build:production",
      "serverTarget": "my_app:server:production"
    }
  }
},

The below is correct and compiled successfully:

"serve": {
  "builder": "@angular-devkit/build-angular:dev-server",
  "options": {
    "browserTarget": "my_app:build"
  },
  "configurations": {
    "production": {
      "browserTarget": "my_app:build:production"
    }
  }
},

Bonus for those who are working with Angular Universal. If you want to run SSR on localhost, then indeed you need the serverTarget. However, for that you have to create a new section within the angular.json, something like:

"serve-ssr": {
  "builder": "@nguniversal/builders:ssr-dev-server",
  "options": {
    "browserTarget": "my_app:build",
    "serverTarget": "my_app:server"
  },
  "configurations": {
    "production": {
      "browserTarget": "my_app:build:production",
      "serverTarget": "my_app:server:production"
    }
  }
},

Then ng run my_app:serve-ssr.

Actually I got this error when upgrading Angular from version 10 into 8 and wanted to improve some things. Then I've messed up the serverTarget thing with that wrong thinking, hopefully this will help out someone with Angular Universal in a project.

This error also shows when we add some properties that are not supported in the angular.json configuration

The Angular application we create must be listed under the projects properties (with a 's'), but in this case it is under project

The top level properties are listed here

I think it's with RxJS's incompatibility. You should install rxjs-compat to fix this.

npm install rxjs-compat

Also, the name of the file is angular.json and not .angular.json

go to package.json and change the version of @angular-devkit/build-angular as follows:

@angular-devkit/build-angular": "^0.12.4"

Remove these two lines from the angular.json file:

"vendorSourceMap":"true",
"evalSourceMap":"true".

removing the flag es5BrowserSupport: true from angular.json fixed the problem.

Since I was updating from Angular7 to Angular11, I skipped a point from https://update.angular.io/ upgrade guide.

Remove any es5BrowserSupport flags in your angular.json and set your target to es2015 in your tsconfig.json. Angular now uses your browserslist to determine if an ES5 build is needed. ng update will migrate you automatically.

I just deleted the node_module folder and run

> NPM Install

and it worked fine for me.

It is an Angular 9 solution.

After trying everything that are written above, it still didn't work. Until, I rebooted my system. Add this to your last resort.

• Reboot system

just remove node_modules and do npm i sometimes some packages don't compile well, when you switch from one version to another version

please check your "angular/cli" version in "package.json", the version number must be similar to other angular packages.

  "devDependencies": {
    "@angular-devkit/build-angular": "~0.803.29",
     "@angular/cli": "~13.2.2", (this is the wrong one)
    "@angular/compiler-cli": "~8.2.14",

In my project I was using a relative import in one of the files to another library outside the scope of ng-packagr (../another-lib). After changing to a module import (@scope/another-lib) it worked.