TOML → JSON on the command line with fx (aka “toml to json cli”)

Fx understands TOML. That means you can convert TOML to JSON (and query it) straight from your terminal—no extra tools.

Quick start: TOML to JSON

Pretty-print TOML as JSON:

fx config.toml .

Save JSON to a file:

fx config.toml . > config.json

Read from stdin:

cat Cargo.toml | fx --toml .

To explore the file interactively instead, run fx config.toml without arguments.

Query fields (using JS expressions)

fx Cargo.toml '.package.name'

fx Cargo.toml 'Object.keys(x.dependencies)'

Notes

• Fx auto-detects TOML by filename; you can also pipe TOML via stdin with --toml flag.
• Comments in TOML are ignored (JSON has no comments).
• Preserves order of keys in objects.
• Works the same way with JSON and YAML, so one tool covers them all.

Fx is a fast, simple way to convert and explore TOML on the command line.