I can't install db-mysql in node.js When I execute this command: npm install db-mysql, I get the following result.  What's the solution to this problem?

C:\Users\Mouad&gt;npm install db-mysql
npm http GET https: //registry.npmjs.org/db-mysql
npm http GET https: //registry.npmjs.org/db-mysql
npm http GET https: //registry.npmjs.org/db-mysql
npm ERR! Error: SELF_SIGNED_CERT_IN_CHAIN
npm ERR!     at SecurePair.&lt;anonymous&gt; (tls.js:1283:32)
npm ERR!     at SecurePair.EventEmitter.emit (events.js:92:17)
npm ERR!     at SecurePair.maybeInitFinished (tls.js:896:10)
npm ERR!     at CleartextStream.read [as _read] (tls.js:430:15)
npm ERR!     at CleartextStream.Readable.read (_stream_readable.js:294:10)
npm ERR!     at EncryptedStream.write [as _write] (tls.js:344:25)
npm ERR!     at doWrite (_stream_writable.js:211:10)
npm ERR!     at writeOrBuffer (_stream_writable.js:201:5)
npm ERR!     at EncryptedStream.Writable.write (_stream_writable.js:172:11)
npm ERR!     at write (_stream_readable.js:547:24)
npm ERR! If you need help, you may report this log at:
npm ERR!     &lt;http: //github.com/isaacs/npm/issues&gt;
npm ERR! or email it to:
npm ERR!     "npm-@googlegroups.com"

npm ERR! System Windows_NT 6.1.7601
npm ERR! command "C:\\Program Files\\nodejs\\\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-&gt; cli.js" "install" "db-mysql"
npm ERR! cwd C:\Users\Mouad
npm ERR! node -v v0.10.4
npm ERR! npm -v 1.2.18
npm ERR!
npm ERR! Additional logging details can be found in:
npm ERR!     C:\Users\Mouad\npm-debug.log
npm ERR! not ok code 0
Either change config to allow SELF_SIGNED_CERT

npm config set strict-ssl false


or change registry url to http:// one

npm config set registry="http://registry.npmjs.org/"