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

Question

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

Schema validation failed with the following errors:

Answer 1

Change package.json from:

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

to:

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

Answer 2

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

Answer 3

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.

Answer 4

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.

Answer 5

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

Answer 6

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.