JSON TOML

JSON to TOML Converter

Convert JSON to TOML in your browser. Free, private, and fast. JSON as a TOML config file — nothing is uploaded.

Drag & drop your JSON file here

or

Max file size: 50 MB · Your file stays in your browser

Your file is processed locally in your browser — nothing is ever uploaded.

Why Convert JSON to TOML?

Turn a JSON object into a clean TOML file for Cargo, pyproject.toml or Hugo-style configuration. TOML has no null value, so keys that are null are left out.

Common use cases

  • You have a JSON file and need it in TOML format.
  • The target software or platform requires TOML but your file is in JSON.
  • Typical use of TOML: Reading project configuration as JSON for scripts.
  • You want to reduce file size or improve compatibility without using desktop software.
Keep in mind: TOML has no null value and needs a table at the top level, so some JSON and YAML documents cannot be expressed in it without changes.

How to Convert JSON to TOML

  1. Upload or drop your JSON file into the converter above.
  2. Adjust any output settings for TOML if needed.
  3. Click Convert and download your converted file instantly.

About the Formats

JSON (JavaScript Object Notation)

JSON is the standard data-interchange format of the web. It represents structured data as nested objects and arrays in plain text — human-readable, language-independent, and natively supported by every programming language and API in common use.

Compatibility: Universal — every programming language, browser, and modern tool reads JSON.

TOML (Tom's Obvious Minimal Language)

TOML is a configuration file format designed to be easy for people to read and write. It is used by Rust (Cargo), Python (pyproject.toml), Hugo and many other tools, and maps clearly onto a dictionary of values.

Compatibility: Supported by libraries for every major programming language.

100% Private & Browser-Based

Your files never leave your device. All conversion happens locally in your browser — nothing is uploaded to any server. No sign-up required.

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Need the reverse?

TOML to JSON Converter

FAQ

Frequently Asked Questions

Yes — completely free with no sign-up, no watermarks, and no size limits for typical files.

Quality depends on the output settings. For lossless output, choose the highest quality setting available.

Your file is processed entirely within your browser using local JavaScript. It is never uploaded to any server. Only you can access your file.

For browser-based conversion, files up to 50 MB work best. Very large files may take longer depending on your device. We recommend splitting very large files before converting.

Currently, AintoB converts one file at a time to keep the browser-based process simple and private. Reload the page to convert another file.