Resend Email API Emulator

Fully stateful Resend API emulation. Emails, domains, API keys, audiences, and contacts persist in memory. Sent emails are captured and viewable through the inbox UI or the REST API.

No real emails are sent. Every call to POST /emails stores the message locally so you can inspect it programmatically or in the browser.

Start

# Resend only
npx emulate --service resend

# Default port (when run alone)
# http://localhost:4000

Or programmatically: