How to install npm and pm2 using putty if these errors occur?

root@ShaliniSite:/home/nodeapp# sudo npm install -g pm2
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WARN engine pm2@5.2.2: wanted: {"node":">=10.0.0"} (current: {"node":"8.10.0","npm":"3.5.2"})
npm ERR! Linux 4.15.0-189-generic
npm ERR! argv "/usr/bin/node" "/usr/bin/npm" "install" "-g" "pm2"
npm ERR! node v8.10.0
npm ERR! npm  v3.5.2
npm ERR! code EMISSINGARG

npm ERR! typeerror Error: Missing required argument #1
npm ERR! typeerror     at andLogAndFinish (/usr/share/npm/lib/fetch-package-metadata.js:31:3)
npm ERR! typeerror     at fetchPackageMetadata (/usr/share/npm/lib/fetch-package-metadata.js:51:22)
npm ERR! typeerror     at resolveWithNewModule (/usr/share/npm/lib/install/deps.js:456:12)
npm ERR! typeerror     at /usr/share/npm/lib/install/deps.js:457:7
npm ERR! typeerror     at /usr/share/npm/node_modules/iferr/index.js:13:50
npm ERR! typeerror     at /usr/share/npm/lib/fetch-package-metadata.js:37:12
npm ERR! typeerror     at addRequestedAndFinish (/usr/share/npm/lib/fetch-package-metadata.js:82:5)
npm ERR! typeerror     at returnAndAddMetadata (/usr/share/npm/lib/fetch-package-metadata.js:117:7)
npm ERR! typeerror     at pickVersionFromRegistryDocument (/usr/share/npm/lib/fetch-package-metadata.js:134:20)
npm ERR! typeerror     at /usr/share/npm/node_modules/iferr/index.js:13:50
npm ERR! typeerror This is an error with npm itself. Please report this error at:
npm ERR! typeerror     <http://github.com/npm/npm/issues>
WARN engine pidusage@3.0.2: wanted: {"node":">=10"} (current: {"node":"8.10.0","npm":"3.5.2"})
WARN engine mkdirp@1.0.4: wanted: {"node":">=10"} (current: {"node":"8.10.0","npm":"3.5.2"})
WARN engine semver@7.3.8: wanted: {"node":">=10"} (current: {"node":"8.10.0","npm":"3.5.2"})

npm ERR! Please include the following file with any support request:
npm ERR!     /home/nodeapp/npm-debug.log