How to install edge.js

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Javascript

I want to connect to database so i've chosen node.js and edge.js
i've installed node.js as per the instructions in http://java.dzone.com/articles/how-leverage-sql-server-nodejs
i've installed node.js but when i try to install edge.js it displays following error why is it so? Any help is greatly appreciated

C:\projects\node-edge-test1>npm install edge
npm ERR! Windows_NT 6.1.7601
npm ERR! argv "C:\\Program Files\\nodejs\\\\node.exe" "C:\\Program File
\\node_modules\\npm\\bin\\npm-cli.js" "install" "edge"
npm ERR! node v0.12.0
npm ERR! npm  v2.5.1
npm ERR! code SELF_SIGNED_CERT_IN_CHAIN

npm ERR! self signed certificate in certificate chain
npm ERR!
npm ERR! If you need help, you may report this error at:
npm ERR!     <http://github.com/npm/npm/issues>

npm ERR! Please include the following file with any support request:
npm ERR!     C:\projects\node-edge-test1\npm-debug.log