when I'm typing commands which starts with npm, it shows the massage of , "'npm' is not recognized as internal or external command"
First of all Download and install node.js from here Nodejs.org
There are two ways to do this
the short way is,
1. Go to settings
2. Now you are on System window, click About
3. Next, Click on Advanced system settings button
4. Then, Click Environment Variable on the dialogue box
5. From Environment Variable, Select Path
6. And then click Edit
7. click New
8. At the text box, add ; C:\Program Files\node.js\
9. Click Ok all the open dialogue box
Also posted on my own blog: Fix ~ npm not recognized as internal or external command