TOML to JSON Converter Online

What is TOML to JSON Conversion?

TOML to JSON conversion is the process of taking a TOML config file (with sections, key-value pairs, and explicit types) and rewriting it as JSON, the format almost every API and JavaScript app expects. The two formats hold the same kind of data, but JSON is what tools, APIs, and most languages parse without setup. A toml to json converter walks your TOML, preserves the types (strings, ints, floats, booleans, dates), and writes them out as valid JSON. You'll usually run a toml to json conversion when you need to feed config from Cargo.toml, pyproject.toml, or a Hugo TOML file into a script or API that only speaks JSON.

Why Convert TOML to JSON?

JSON is the universal format for APIs, browsers, and most modern programming languages. TOML, on the other hand, is great for human-edited config: Rust's Cargo, Python's Poetry and Hatch, Hugo, and a long list of Go and Rust projects rely on it. Converting toml to json online lets you pull data out of those config files and use it programmatically. Use a toml to json tool when you need to read package metadata in a JavaScript build script, expose TOML config to a tool that only takes JSON, generate JSON test fixtures from TOML samples, or compare TOML and JSON config side by side.

How Our TOML to JSON Converter Works

When you click Convert, the tool parses your TOML using a strict TOML parser, then serializes it as pretty-printed JSON. Sections become nested objects, arrays of tables become arrays of objects, and explicit TOML types (datetimes, integers, floats, booleans) are mapped to the appropriate JSON value. Comments are dropped because JSON doesn't support them. Everything happens in your browser. Your TOML data is not uploaded to any server.

Features You Get

• One-click conversion: hit Convert and the JSON appears in the output panel.
• Type-aware output: numbers, booleans, dates, and arrays each get the right JSON form.
• Nested table support: TOML sections and subtables become nested JSON objects.
• Array of tables support: [[items]] blocks become arrays of JSON objects automatically.
• Upload support: load a .toml file from your device or drag-and-drop it into the input.
• One-click copy: grab the JSON output with the Copy button and paste it anywhere.

How to Use the Tool

1. Paste your TOML into the input editor, or use the Upload File button to load a .toml file.
2. Click the Convert button to generate the JSON output on the right.
3. Click the Copy button to copy the JSON to your clipboard.
4. Use the Clear button to reset both editors when you want to start over.

Common Use Cases

• Build scripts: reading Cargo.toml or pyproject.toml metadata in tools that only take JSON.
• API testing: turning TOML config drafts into JSON to send as request payloads.
• Data hand-offs: converting human-edited TOML into JSON for backend services.
• Test fixtures: generating JSON samples from TOML files for tests that read JSON.

Example Conversion

[server]
host = "localhost"
port = 3000

{
  "server": {
    "host": "localhost",
    "port": 3000
  }
}

Frequently Asked Questions

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