react项目在package.json中配置proxy之后，报错
$ npm run start > img@0.1.0 start D:\xx\src\img > react-scripts start When specified, "proxy" in package.json must be a string. Instead, the type of "proxy" was "object". Either remove "proxy" from package.json, or make it a string. npm ERR! code ELIFECYCLE npm ERR! errno 1 npm ERR! img@0.1.0 start: `react-scripts start` npm ERR! Exit status 1 npm ERR! npm ERR! Failed at the img@0.1.0 start script. npm ERR! This is probably not a problem with npm. There is likely additional logging output above. npm ERR! A complete log of this run can be found in: npm ERR! C:\Users\xx\AppData\Roaming\npm-cache\_logs\2019-09-11T08_04_08_822Z-debug.log
原因是react-scripts模块中从2开始改变了proxy的配置方式，解决的方法有两种
第一种方式是，指定安装react-scripts的老版本
1.删除node_modules/react-scripts
2.重新安装 npm i react-scripts@1.1.1 --save
第二种方式是，使用新版本proxy的配置方法
1.安装http-proxy-middleware
$ npm install http-proxy-middleware --save $ # or $ yarn add http-proxy-middleware --save
2.src目录下新建文件：setupProxy.js，配置代码为：
const proxy = require(‘http-proxy-middleware‘) module.exports = function(app) { app.use(proxy(‘/api‘, { "target": "https://localhost:5000/", "changeOrigin": true, "pathRewrite": { "/": "/" } })) //app.use(proxy(...)) //可以配置多个代理 }
When specified, "proxy" in package.json must be a string.
原文：https://www.cnblogs.com/Netsharp/p/11506893.html