ASCII Domain Converter

Create a utility that turns domain names or email addresses into ASCII-safe form while leaving already-ASCII content unchanged. When an @ is present, only convert the domain portion; the local part must be preserved verbatim. Repeated calls on already-converted input should not alter the result further.

Capabilities

Convert Unicode domains

• "mañana.com" becomes "xn--maana-pta.com" @test
• "δοκιμή。com" normalizes legacy separators and converts to "xn--jxalpdlp.com" @test

Convert email domains

• "info@bücher.example" becomes "info@xn--bcher-kva.example" while keeping the local part intact @test

Preserve ASCII inputs

• "user@example.com" stays "user@example.com" @test

Implementation

@generates

API

export function toAsciiAddress(input);

Dependencies { .dependencies }

punycode { .dependency }

Provides conversion utilities for domain and email data.