JSON to TOML Converter
Convert JSON objects and arrays into TOML configuration text in your browser.
Presets
JSON input
Paste a JSON object, array, or value up to 1 MB. Null values are rejected because TOML has no null type.
Input must be valid JSON.
TOML output
When to use JSON to TOML Converter
Common ways to use JSON to TOML Converter:
- Convert app configuration
Move a JSON settings object into TOML for tools that prefer TOML config files.
- Validate data before sharing
Catch malformed JSON, unsupported null values, or TOML syntax issues before sending config snippets to teammates.
- Debug nested settings
Turn nested objects into readable TOML tables so you can inspect sections and values quickly.
- Copy clean config output
Generate TOML or JSON and copy it directly into documentation, tickets, pull requests, or chat.
- Convert configuration on mobile
Use the browser-only workflow on a phone or tablet without installing command-line tools.
JSON to TOML Converter FAQ
- How do I convert JSON to TOML?
- Choose JSON to TOML, paste valid JSON, and the TOML output appears automatically. Use Copy or Download when the result is ready.
- Can I convert TOML back to JSON?
- Yes. Switch the direction to TOML to JSON, paste TOML text, and the app formats the parsed data as readable JSON.
- Does TOML support JSON null values?
- No. TOML has no null type, so the converter asks you to replace null with a string, number, boolean, array, or object before exporting.
- Is my configuration data stored?
- No. Conversion happens in your browser. AppDoesIt does not store the JSON or TOML text you paste into this tool.
- Why did I get a validation error?
- Most errors come from malformed JSON, unsupported null values, or TOML syntax issues such as missing equals signs or unclosed quotes.
JSON to TOML Converter Help
How to use
- Choose the conversion direction that matches your source text.
- Paste JSON or TOML into the input panel; conversion runs automatically as you type.
- Review validation feedback and fix any highlighted syntax or unsupported values.
- Copy the output or download it as a .toml or .json file.
Tips
- For JSON to TOML, nested objects become TOML tables and arrays remain inline arrays.
- Use quoted JSON keys when names contain spaces; the converter quotes TOML keys when needed.
- Use Clear before starting a new conversion to remove old output and status messages.
Troubleshooting
- If JSON fails, check for trailing commas, comments, unquoted property names, or null values that TOML cannot represent.
- If TOML fails, check table headers, quoted strings, arrays, and key/value separators.
- Inputs over 1 MB are rejected to keep the browser responsive.
Privacy and browser behavior
- Conversion runs locally in your browser; this app does not upload your input or output to a server.
- Clipboard and download actions only run after you click Paste, Copy, or Download.