TML

TOML <-> JSON Converter

LOCAL · Browser-Only

Convert between TOML and JSON formats instantly

Direction

Indent

Validate only

Input

Output

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What is TOML/JSON Converter?

Convert TOML to JSON or JSON to TOML instantly with full TOML v1.0 specification support.

The built-in parser handles all TOML features including dotted keys, inline tables, arrays of tables, multiline strings, datetime types, hex/octal/binary integers, and more. Convert a Cargo.toml or pyproject.toml file to JSON, turn a Hugo config into JSON for tooling, or transform JSON data back into clean TOML config. Choose your JSON indentation style, auto-detect input format, and swap between directions with one click. Upload .toml or .json files, download the converted output, or copy to clipboard. All processing runs in your browser with no data sent anywhere.

How to Use TOML/JSON Converter

1Paste your TOML or JSON content into the input area, or upload a file
2The tool auto-detects the format, or you can set the direction manually
3Choose your preferred JSON indentation style
4Copy the converted output or download it as a file

Frequently Asked Questions

What is TOML?

TOML (Tom's Obvious Minimal Language) is a configuration file format designed to be easy to read. It is used by Rust (Cargo.toml), Python (pyproject.toml), Hugo, and many other tools as an alternative to YAML or JSON for configuration.

Does this support the full TOML spec?

Yes. The parser handles the complete TOML v1.0 specification including dotted keys, inline tables, arrays of tables, multiline strings, datetime types, hex/octal/binary integers, inf, nan, and escape sequences.

Can I convert JSON back to TOML?

Yes. The converter is fully bidirectional. Paste JSON and it will generate properly formatted TOML with section headers and correct value types.

Is my data safe?

Yes. All parsing and conversion happens locally in your browser. Your configuration data is never sent to any server.

How do I convert a Cargo.toml or pyproject.toml to JSON?

Paste the file contents or upload the .toml file and the tool auto-detects the format and outputs JSON. Arrays of tables like [[bin]] in Cargo.toml become JSON arrays, and dotted keys are nested correctly so the structure round-trips cleanly.

Why would I convert TOML config to JSON?

Many tools and scripts read JSON more easily than TOML, so converting lets you feed config into a JavaScript app, a JSON schema validator, or an API. Converting back to TOML afterward keeps the human-readable format for your repository.

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Keep reading: JSON Syntax Cheat Sheet and cron expressions reference. Doing this in code instead? See the encoding endpoints.

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