Check npm package name availability from the command line.

brew install arjunsajeev/tap/npmcheck

go install github.com/arjunsajeev/npmcheck@latest

Download the latest binary from the releases page.

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

npmcheck my-awesome-package another-package

Output:

• ✅ indicates the package name is available
• ❌ indicates the package name is already taken
• ⚠️ indicates an error occurred while checking

# Check a single package
npmcheck my-new-package

# Check multiple packages at once
npmcheck pkg1 pkg2 pkg3

• Go 1.25 or later

Using just (recommended):

# Install just: brew install just (or see https://github.com/casey/just)

# List all available commands
just

# Build the binary
just build

# Run tests
just test

# Run all checks
just ci

Or using make:

# Build the binary
make build

# Run tests
make test

Or directly with Go:

# Build the binary
go build -o npmcheck

# Run tests
go test ./...

# Install locally
go install

To test the GoReleaser configuration locally without publishing:

goreleaser release --snapshot --clean

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

MIT