在Angular项目中，angular.json和package.json都是重要的配置文件。其中，angular.json是Angular CLI项目的配置文件，而package.json是node.js的包管理器npm所用的文件。下面是它们的区别：

1. angular.json用于配置Angular CLI的项目，其中包括项目的结构、构建选项、依赖关系等。而package.json主要用于管理node.js的依赖项和脚本。

2. angular.json是Angular CLI的配置文件，所以更改它需要重新运行ng serve。而package.json的更改则会自动更新依赖项。

3. angular.json在项目根目录中，而package.json在项目的根目录或src目录中。

以下是示例代码：

// angular.json { "projects": { "my-app": { "root": "", "sourceRoot": "src", "projectType": "application", "prefix": "app", "schematics": { "@schematics/angular:component": { "styleext": "scss" } }, "architect": { "build": { "builder": "@angular-devkit/build-angular:browser", "options": { "outputPath": "dist/my-app", "index": "src/index.html", "main": "src/main.ts", "polyfills": "src/polyfills.ts", "tsConfig": "src/tsconfig.app.json", "aot": true, "assets": [ "src/favicon.ico", "src/assets" ], "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 } } }, "serve": { "builder": "@angular-devkit/build-angular:dev-server", "options": { "browserTarget": "my-app:build" } }, "extract-i18n": { "builder": "@angular-devkit/build-angular:extract-i18n", "options":