Grafana Alloy is the new name for our distribution of the OTel collector. Grafana Agent has been deprecated and is in Long-Term Support (LTS) through October 31, 2025. Grafana Agent will reach an End-of-Life (EOL) on November 1, 2025. Read more about why we recommend migrating to Grafana Alloy.
Open source

The fmt command

The fmt command formats a given Grafana Agent Flow configuration file.



  • AGENT_MODE=flow grafana-agent fmt [FLAG ...] FILE_NAME

  • grafana-agent-flow fmt [FLAG ...] FILE_NAME

    Replace the following:

    • FLAG: One or more flags that define the input and output of the command.
    • FILE_NAME: The Grafana Agent Flow configuration file.

If the FILE_NAME argument is not provided or if the FILE_NAME argument is equal to -, fmt formats the contents of standard input. Otherwise, fmt reads and formats the file from disk specified by the argument.

The --write flag can be specified to replace the contents of the original file on disk with the formatted results. --write can only be provided when fmt is not reading from standard input.

The command fails if the file being formatted has syntactically incorrect River configuration, but does not validate whether Flow components are configured properly.

The following flags are supported:

  • --write, -w: Write the formatted file back to disk when not reading from standard input.