CRYSTAL-PLAY(1) Crystal Compiler Command Line Reference Guide CRYSTAL-PLAY(1)

crystal-play - Run the Crystal playground

crystal play [options] [file]

Starts the crystal playground server on port 8080, by default.

-p PORT, --port PORT

Run the playground on the specified port. Default is 8080.

-b HOST, --binding HOST

Bind the playground to the specified IP.

-v, --verbose

Display detailed information of the executed code.
2026-07-23 crystal 1.21.0