摘要
最近更新了一次node，但是更新后npm的命令总是会报
npm WARN deprecated fsevents@2.0.6: Please update: there are crash fixes
npm WARN deprecated text-encoding@0.7.0: no longer maintained
npm WARN deprecated fsevents@1.2.9: One of your dependencies needs to upgrade to fsevents v2: 1) Proper nodejs v10+ support 2) No more fetching binaries from AWS, smaller package size
npm WARN deprecated core-js@2.3.0: core-js@<3.0 is no longer maintained and not recommended for usage due to the number of issues. Please, upgrade your dependencies to the actual version of core-js@3.
npm WARN deprecated core-js@1.2.7: core-js@<2.6.8 is no longer maintained. Please, upgrade to core-js@3 or at least to actual version of core-js@2.
npm WARN deprecated left-pad@1.3.0: use String.prototype.padStart()
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: ajv@^6.5.5 (node_modules\har-validator\node_modules\ajv):
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: Unexpected end of JSON input while parsing near '...:"^2.0.0-rc.0","glob"'
npm ERR! Unexpected end of JSON input while parsing near '...:"^2.0.0-rc.0","glob"'
的错误信息，导致无法进行正常的npm install。经过半天的错误信息搜索，找到了较为友好的解决办法。
解决办法
方法一：清除npm缓存
具体命令步骤：
npm cache clean --force //清除npm缓存
npm install @(Library you need) //下载安装你需要的库
方法二：删除合并文件
具体命令步骤：
删除package.lock.json合并文件
npm install @(Library you need) //下载安装你需要的库
方法三：配置默认注册表
具体命令步骤：
注册表配置修改为默认值：
npm config set registry https://registry.npmjs.org/
参考地址：https://github.com/npm/npm/issues/19072
总结
分享一下解决npm的JSON意外结束的方法，大家如果有更好的办法可以评论出来，一起学习。。。