TOML ⇄ JSON Converter

Convert TOML to JSON and JSON to TOML instantly with full TOML 1.0 support. 100% client-side.

Input (TOML)493 chars

Output (JSON)

744 chars

{
  "package": {
    "name": "codekeet",
    "version": "1.0.0",
    "edition": "2021",
    "authors": [
      "CodeKeet Team <hello@codekeet.com>"
    ],
    "description": "Developer tools platform"
  },
  "dependencies": {
    "serde": {
      "version": "1.0",
      "features": [
        "derive"
      ]
    },
    "tokio": {
      "version": "1.35",
      "features": [
        "full"
      ]
    },
    "reqwest": "0.11"
  },
  "features": {
    "default": [
      "std"
    ],
    "std": []
  },
  "bin": [
    {
      "name": "codekeet-web",
      "path": "src/main.rs"
    },
    {
      "name": "codekeet-cli",
      "path": "src/cli.rs"
    }
  ],
  "profile": {
    "release": {
      "opt-level": 3,
      "lto": true
    }
  }
}

🔒 100% private: All conversion happens in your browser. Your config files never leave your device.

About TOML to JSON Converter

TOML (Tom's Obvious Minimal Language) is a configuration file format designed to be easy to read and write. It is used by Rust (Cargo.toml), Python (pyproject.toml for Poetry/PEP 518), Hugo (config.toml), Netlify, and many modern tools. TOML is similar to INI files but with richer types: integers, floats, booleans, dates, arrays, and nested tables. Because many tools and APIs only accept JSON, converting between TOML and JSON is a common task — deploying a config, loading settings in a JS app, or migrating between ecosystems. This tool converts both ways in your browser with full TOML 1.0 support.

How It Works

Choose a direction: TOML → JSON or JSON → TOML.
Paste your TOML or JSON into the input box.
The output updates live as you type.
Copy the result or download it as a .json / .toml file.

✨ Key Features

✓TOML → JSON conversion (TOML v1.0.0)
✓JSON → TOML conversion
✓Support for tables [section]
✓Support for nested tables [a.b.c]
✓Support for arrays of tables [[items]]
✓Support for inline tables { key = "value" }
✓Support for arrays (mixed types)
✓Support for strings (basic, literal, multi-line)
✓Support for integers, floats, booleans
✓Support for dates and datetimes (RFC 3339)
✓Live conversion as you type
✓Download as .json or .toml file
✓100% client-side — no data sent to any server

🎯 Common Use Cases

→Reading Cargo.toml or pyproject.toml as JSON
→Converting Hugo config.toml to JSON for a build script
→Migrating from JSON config to TOML
→Debugging TOML parsing errors
→Preparing TOML config from an API response
→Converting Netlify.toml for automated processing
→Building documentation of a TOML schema
→Learning the difference between TOML and JSON syntax

💡 Advanced Tips & Pro Insights

▸TOML is stricter than JSON: strings must be double-quoted (basic) or single-quoted (literal). Bare strings are not allowed.
▸TOML dates are first-class: 1979-05-27T07:32:00Z is a datetime, 1979-05-27 is a date. In JSON, these are strings.
▸Arrays of tables ([[items]]) become arrays of objects in JSON. This is TOML's way of representing lists of structured records.
▸Inline tables ({ key = "value" }) cannot span multiple lines in TOML 1.0. For multi-line structures, use regular tables.
▸Order matters in TOML: a table cannot be defined twice. This tool preserves order and validates against duplicate keys.

Frequently Asked Questions

Is this TOML converter free?▾

Yes, this TOML to JSON and JSON to TOML converter is completely free with no signup, email, or usage limits.

Is my data safe?▾

Yes, 100% safe. All conversion happens in your browser. Your config files are never uploaded to any server.

What is TOML?▾

TOML (Tom's Obvious Minimal Language) is a configuration file format designed to be human-readable. It is used by Cargo.toml (Rust), pyproject.toml (Python), Hugo (config.toml), and many modern tools.

What is the difference between TOML and JSON?▾

TOML is designed for humans (config files) — it has comments, dates as a native type, and a cleaner syntax for tables. JSON is designed for machines (APIs) — it is more compact but less readable. TOML does not support null; JSON does.

Does it support multi-line strings?▾

Yes. TOML supports """triple-quoted multi-line""" basic strings and '''triple-quoted literal''' strings. Both are handled correctly and converted to JSON strings.

How are dates handled?▾

TOML has native date and datetime types. This tool converts them to ISO 8601 strings in JSON (e.g., "1979-05-27T07:32:00Z").

What happens to comments?▾

TOML comments (# ...) are ignored during parsing. They are not preserved in the output (neither JSON nor regenerated TOML has them).

Can I convert Cargo.toml or pyproject.toml?▾

Yes. Paste any Cargo.toml (Rust), pyproject.toml (Python/Poetry), or Hugo config.toml and convert it to JSON for use in scripts, APIs, or other tools.