TOML to JSON Converter

Convert Cargo.toml, pyproject.toml and other TOML configs to JSON — or JSON back to TOML.

Free
No sign-up
Runs in your browser

Direction

TOML → JSONJSON → TOML

TOML

JSON

{
  "title": "My App",
  "version": "1.4.0",
  "server": {
    "host": "0.0.0.0",
    "port": 8080,
    "timeout": 30.5
  },
  "database": {
    "url": "postgres://localhost/app",
    "pool": {
      "min": 2,
      "max": 10
    }
  },
  "users": [
    {
      "name": "ada",
      "roles": [
        "admin"
      ]
    },
    {
      "name": "bob",
      "roles": [
        "editor",
        "viewer"
      ]
    }
  ]
}

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Works with Cargo.toml, pyproject.toml, Hugo and Netlify configs. Dates are kept as text.

Everything you type is processed in your browser. Nothing you enter is sent to our servers or stored by us.

How to use the TOML to JSON Converter

Paste TOML or JSON and pick the direction.
Fix any error shown with its line number.
Copy or download the result.

What does this tool do?

TOML is the config format behind Rust's Cargo, Python's pyproject.toml, Hugo and Netlify. Converting to JSON makes it easy to process with other tools; converting back gives you a tidy, readable config with [tables] and [[arrays of tables]]. Dates and times are kept as text.

Everything runs in your browser — nothing you paste is uploaded.

Why use it?

Both directions.
Validates as you type.
Clear error lines.

Privacy

Everything you type is processed in your browser. Nothing you enter is sent to our servers or stored by us. There's no account to create and nothing to install.

Last reviewed October 4, 2026 by the M2Toolkit team.

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How to use the TOML to JSON Converter

What does this tool do?

Why use it?

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