Ionic install error status code 400 - ionic-framework

Question

Welcome I want install ionic but I can't. i installed corodva.
My error status code 400(Bad Request) why?
> C:\Windows\System32>npm install -g cordova
npm WARN engine xmlbuilder#2.2.1: wanted: {"node":"0.8.x || 0.10.x"} (current: {"node":"4.2.2","npm":"2.14.3"})
C:\Users\kacper\AppData\Roaming\npm\cordova -> C:\Users\kacper\AppData\Roaming\npm\node_modules\cordova\bin\cordova
cordova#5.3.1 C:\Users\kacper\AppData\Roaming\npm\node_modules\cordova
├── underscore#1.7.0
├── q#1.0.1
├── nopt#3.0.1 (abbrev#1.0.7)
└── cordova-lib#5.3.1 (valid-identifier#0.0.1, unorm#1.3.3, osenv#0.1.0, properties-parser#0.2.3, bplist-parser#0.0.6, semver#4.3.6, shelljs#0.3.0, cordova-app-hello-world#3.9.0, npm#2.14.3, dep-graph#1.1.0, rc#0.5.2, xcode#0.8.0, elementtree#0.1.6, npmconf#2.1.2, glob#4.0.6, plist#1.1.0, cordova-serve#0.1.3, request#2.47.0, aliasify#1.7.2, init-package-json#1.9.1, tar#1.0.2, cordova-registry-mapper#1.1.11, cordova-js#4.1.1)
C:\Windows\System32>npm install -g ionic
npm ERR! Windows_NT 10.0.10240
npm ERR! argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Users\\kacper\\AppData\\Roaming\\npm\\node_modules\\npm\\bin\\npm-cli.js" "install" "-g" "ionic"
npm ERR! node v4.2.2
npm ERR! npm v2.14.3
npm ERR! code ECONNRESET
npm ERR! network tunneling socket could not be established, statusCode=400
npm ERR! network This is most likely not a problem with npm itself
npm ERR! network and is related to network connectivity.
npm ERR! network In most cases you are behind a proxy or have bad network settings.
npm ERR! network
npm ERR! network If you are behind a proxy, please make sure that the
npm ERR! network 'proxy' config is set properly. See: 'npm help config'
npm ERR! Please include the following file with any support request:
npm ERR! C:\Windows\System32\npm-debug.log
Help me.

Answer 1

You have to install Node JS version 0.12.6, and after that
npm install -g cordova ionic
it will install Ionic and Cordova.

Answer 2

firstly download and install node.js from
https://nodejs.org/en/
then restart your PC
if you are in a proxy network set your http/https proxy in CMD ( command prompt ) by
set http_proxy=http://[proxy_ip]:[proxy_port]
set https_proxy=https://[proxy_ip]:[proxy_port]
then use
npm cache clean
to clear npm's cache folder
then use the following ling to install ionic and cordovo
npm install -g cordova ionic