捉虫记：Unexpected end of JSON input while parsing

今天在升级 serverless 时，未能安装成功，提示问题如下

$ npm i -g serverless
npm ERR! Unexpected end of JSON input while parsing near '...oyNMOOPIvOSSv8aveUYxO'

npm ERR! A complete log of this run can be found in:
npm ERR!     /root/.npm/_logs/2020-07-17T09_32_21_882Z-debug.log

捉虫

既然是 npm 的问题，那首先去 github 的源码中找找问题

npm 的源码在 https://github.com/npm/cli，找到以下 Issue

• Unexpected end of JSON input while parsing near #21172[1]

解决方案

这是因为本地 npm cache 的问题，清除掉本地的 cache 即可成功，如下所示

$ npm cache clean --force
npm WARN using --force I sure hope you know what you are doing.

$ npm i -g serverless

另外可以通过 npm cache verify 去查看缓存位置

$ npm cache verify
Cache verified and compressed (~/.npm/_cacache):
Content verified: 4217 (168362093 bytes)
Index entries: 5814
Finished in 11.194s

Reference

[1]

Unexpected end of JSON input while parsing near #21172: https://github.com/npm/npm/issues/21172

[2]

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