About this tool
Convert TOML documents to JSON format. Useful when reviewing API responses, cleaning config before commit, or sharing readable snippets in docs and PRs.
Paste TOML (tables, arrays, dotted keys) into Input. Click Convert to get pretty-printed JSON. Example — Convert an app.toml fragment: try `title = "My App" version = "1.0.0" [database] host = "localhost" port = 5432` and expect something like `{ "title": "My App", "version": "1.0.0", "database": { "host": "localhost", "port": 5432 } }`.
Date/time and other TOML-native types serialize to JSON in engine-specific ways — verify before piping into strict schemas. See also: JSON to TOML, YAML to JSON, and JSON Formatter. Runs in your browser — nothing you paste gets uploaded.
How to use
- Paste TOML (tables, arrays, dotted keys) into Input.
- Click Convert to get pretty-printed JSON.
- Use the Output when you need JSON for a tool that does not read TOML natively.
- Fix TOML syntax errors shown in the error banner, then Convert again.
Example
Convert an app.toml fragment
Input
title = "My App" version = "1.0.0" [database] host = "localhost" port = 5432
Output
{
"title": "My App",
"version": "1.0.0",
"database": {
"host": "localhost",
"port": 5432
}
}Limitations
- Date/time and other TOML-native types serialize to JSON in engine-specific ways — verify before piping into strict schemas.
- Extremely large TOML files may hit browser memory limits.
- Inline table edge cases can differ slightly from your CLI `toml` tool; spot-check critical configs.
Related guides
1Related tools
3Frequently asked questions
What does the TOML to JSON do?
Convert TOML documents to JSON format. Runs in your browser — no install, no account.
How do I use the TOML to JSON?
Paste TOML (tables, arrays, dotted keys) into Input. Click Convert to get pretty-printed JSON. Use the Output when you need JSON for a tool that does not read TOML natively. Fix TOML syntax errors shown in the error banner, then Convert again.
Is the TOML to JSON free?
Yes. No signup, no usage limits, no paywall.
Does the TOML to JSON upload my data?
No. Processing happens locally in JavaScript. Your input is not uploaded, stored, or logged.
What are the limitations of the TOML to JSON?
Date/time and other TOML-native types serialize to JSON in engine-specific ways — verify before piping into strict schemas. Extremely large TOML files may hit browser memory limits. Inline table edge cases can differ slightly from your CLI `toml` tool; spot-check critical configs.