$ sudo npm install weixin-js-sdk
$ sudo npm install -g weixin-js-sdk

If want to update the weixin-js-sdk package execute the command as below,

$ sudo npm update weixin-js-sdk

Update package globally,

$ npm install -g weixin-js-sdk

Git clone:

$ sudo  git clone https://github.com/rektide/weixin-js-sdk.git

$ sudo  npm install -g ./weixin-js-sdk

weixin-js-sdk@1.2.0 /usr/lib/node_modules/weixin-js-sdk

How to remove weixin-js-sdk package :

You can uninstall or remove this package from your node_modules run the command as below,

$ sudo npm uninstall weixin-js-sdk

Basic Information of weixin-js-sdk NPM Package: