Angular项目部署Heroku遇package.json解析错误求助

你遇到的这个解析错误，根源是你的package.json里存在不符合JSON标准的尾随逗号——虽然有些JavaScript运行环境允许这种写法，但严格的JSON解析器（比如Heroku使用的）会直接抛出语法错误。

具体有两个位置需要修正：

• scripts区块中"postinstall": "ng build --aot -prod",这行末尾的多余逗号
• engines区块中"npm": "5.6.0",这行末尾的多余逗号

修正后的完整package.json内容如下：

{
  "name": "game2048",
  "version": "0.0.0",
  "license": "MIT",
  "scripts": {
    "ng": "ng",
    "start": "node server.js",
    "build": "ng build --prod",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e",
    "postinstall": "ng build --aot -prod"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "^5.0.0",
    "@angular/cli": "^1.6.1",
    "@angular/common": "^5.0.0",
    "@angular/compiler": "^5.0.0",
    "@angular/core": "^5.1.1",
    "@angular/forms": "^5.0.0",
    "@angular/http": "^5.0.0",
    "@angular/platform-browser": "^5.1.1",
    "@angular/platform-browser-dynamic": "^5.0.0",
    "@angular/router": "^5.0.0",
    "core-js": "^2.4.1",
    "express": "^4.16.2",
    "rxjs": "^5.5.2",
    "zone.js": "^0.8.14"
  },
  "devDependencies": {
    "@angular/compiler-cli": "^5.0.0",
    "@angular/language-service": "^5.0.0",
    "@types/jasmine": "~2.5.53",
    "@types/jasminewd2": "~2.0.2",
    "@types/node": "~6.0.60",
    "codelyzer": "^4.0.1",
    "jasmine-core": "~2.6.2",
    "jasmine-spec-reporter": "~4.1.0",
    "karma": "~1.7.0",
    "karma-chrome-launcher": "~2.1.1",
    "karma-cli": "~1.0.1",
    "karma-coverage-istanbul-reporter": "^1.2.1",
    "karma-jasmine": "~1.1.0",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "~5.1.2",
    "ts-node": "~3.2.0",
    "tslint": "~5.7.0",
    "typescript": "~2.4.2"
  },
  "engines": {
    "node": "8.9.4",
    "npm": "5.6.0"
  }
}

修正后重新推送代码到Heroku，这个解析错误应该就能解决了。另外建议你以后编辑JSON文件时，尽量避免添加这种无意义的尾随逗号，也可以用在线JSON校验工具提前检查语法问题，减少这类低级错误。

内容的提问来源于stack exchange，提问作者Eugen-Andrei Coliban