error while installing in nodejs

[kishor-nrpt]

npm ERR! code E503
npm ERR! 503 Service Unavailable - GET https://nexus-nexus.delivery.squads-dev.com/repository/npm-proxy/tincanjs

npm ERR! A complete log of this run can be found in:
npm ERR! /Users/krkumar/.npm/_logs/2019-09-10T16_20_28_058Z-debug.log

[uglycoyote]

that sounds like a communication failure with the particular server that is acting as a proxy for NPM, and nothing that the maintainers of this library have any control over.