第三方平台上传代码一直提示ext_json解析错误，下面是ext_json字段，帮忙看看哪里错了：
{
ext_json: "{\"extAppid\":\"xxx\",\"directCommit\":true,\"ext\":{\"name\":\"指尖侦探馆\",\"attr\":{\"host\":\"open.qq.com\",\"userId\":\"xxx\"}},\"extPages\":{\"pages/home/index\":{\"navigationBarTitleText\":\"指尖小店\"}, \"pages/me/index\":{\"navigationBarTitleText\":\"个人中心\"}},\"pages\":[\"pages/home/index\",\"pages/me/index\"],\"window\":{\"backgroundTextStyle\":\"light\",\"navigationBarBackgroundColor\":\"#fff\",\"navigationBarTitleText\":\"指尖导航\",\"navigationBarTextStyle\":\"black\"},\"tabBar\":{\"list\":[{\"pagePath\":\"pages/home/index\",\"text\":\"商城首页\"},{\"pagePath\":\"pages/me/index\",\"text\":\"个人中心\"}]}}"
}
补充：后端使用node开发
let ext_json={"extAppid":"xxx","directCommit":true,"ext":{"name":"指尖侦探馆","attr":{"host":"open.qq.com","userId":"xxx"}},"extPages":{"pages/home/index":{"navigationBarTitleText":"指尖小店"}, "pages/me/index":{"navigationBarTitleText":"个人中心"}},"pages":["pages/home/index","pages/me/index"],"window":{"backgroundTextStyle":"light","navigationBarBackgroundColor":"#fff","navigationBarTitleText":"指尖导航","navigationBarTextStyle":"black"},"tabBar":{"list":[{"pagePath":"pages/home/index","text":"商城首页"},{"pagePath":"pages/me/index","text":"个人中心"}]}} ext_json=JSON.stringify(ext_json);""{\"extAppid\":\"xxx\",\"directCommit\":true,\"ext\":{\"name\":\"指尖侦探馆\",\"attr\":{\"host\":\"open.qq.com\",\"userId\":\"xxx\"}},\"extPages\":{\"pages/home/index\":{\"navigationBarTitleText\":\"指尖小店\"}, \"pages/me/index\":{\"navigationBarTitleText\":\"个人中心\"}},\"pages\":[\"pages/home/index\",\"pages/me/index\"],\"window\":{\"backgroundTextStyle\":\"light\",\"navigationBarBackgroundColor\":\"#fff\",\"navigationBarTitleText\":\"指尖导航\",\"navigationBarTextStyle\":\"black\"},\"tabBar\":{\"list\":[{\"pagePath\":\"pages/home/index\",\"text\":\"商城首页\"},{\"pagePath\":\"pages/me/index\",\"text\":\"个人中心\"}]}}""