adding bootstrap files in angular.json code example
Example: bootstrap in angular.json file
{ "$schema": "./node_modules/@angular/cli/lib/config/schema.json", "version": 1, "newProjectRoot": "projects", "projects": { "angular-bootstrap-examples": { "projectType": "application", "schematics": {}, "root": "", "sourceRoot": "src", "prefix": "app", "architect": { "build": { "builder": "@angular-devkit/build-angular:browser", "options": { "outputPath": "dist/angular-bootstrap-examples", "index": "src/index.html", "main": "src/main.ts", "polyfills": "src/polyfills.ts", "tsConfig": "tsconfig.app.json", "aot": true, "assets": [ "src/favicon.ico", "src/assets" ], "styles": [ "./node_modules/bootstrap/dist/css/bootstrap.css", "src/styles.css" ], "scripts": [ "./node_modules/jquery/dist/jquery.js", "./node_modules/bootstrap/dist/js/bootstrap.js" ] },