Command Line

Defining environment variables can vary between OSes. It’s also important to know that this manner is temporary for the life of the shell session.

Windows (cmd.exe)

set "API_URL=abcdef" && dotenv-run -- npm start

(Note: Quotes around the variable assignment are required to avoid a trailing whitespace.)

Windows (Powershell)

($env:API_URL = "abcdef") -and (dotenv-run -- npm start)

Linux, macOS (Bash)

API_URL=abcdef dotenv-run -- npm start