GitHub - arjunsajeev/npmcheck: Fast Go CLI to check npm package name availability

Check npm package name availability from the command line. Pass one name or a few; npmcheck checks them against the public npm registry.

Installation

Homebrew (macOS and Linux)

brew install arjunsajeev/tap/npmcheck

Go Install

go install github.com/arjunsajeev/npmcheck@latest

Download Binary

Download the latest binary from the releases page.

Usage

Check if one or more package names are available on npm:

npmcheck my-awesome-package another-package

Scoped package names work too:

npmcheck @my-scope/my-package

• ✅ available
• ❌ taken
• ⚠️ error

Show the installed version:

Development

Prerequisites

• Go 1.25 or later
• Optional: just for the shortcuts below

Building

Using just:

just
just build
just test
just ci

Or directly with Go:

gofmt -w .
go vet ./...
go build -o npmcheck
go test ./...
go install

Testing GoReleaser

To test the GoReleaser configuration locally without publishing:

goreleaser release --snapshot --clean

Releasing

This project uses GoReleaser for automated releases.

To create a new release:

1. Tag the commit with a semantic version:

   git tag -a v1.0.0 -m "Release v1.0.0"
   git push origin v1.0.0

2. GitHub Actions will automatically:

   • Build binaries for multiple platforms (Linux, macOS, Windows)
   • Create a GitHub release
   • Update the Homebrew formula

License

MIT