TOML ↔ JSON Converter

Convert TOML to JSON and JSON to TOML instantly - great for config files, tooling, and developer workflows.

Convert TOML to JSON - and JSON to TOML - instantly for config files and developer workflows.

Conversion

TOML → JSON

Input TOML

Paste TOML on the left to convert it into JSON.

What this converter supports

Common TOML structures: tables, arrays, inline tables
JSON objects/arrays with pretty TOML output
Runs fully locally for safe config conversions

OUTPUT JSON

{
  "title": "TOML Example",
  "owner": {
    "name": "Casper",
    "dob": "1979-05-27T07:32:00Z"
  },
  "database": {
    "enabled": true,
    "ports": [
      8001,
      8001,
      8002
    ],
    "data": {
      "temp_targets": {
        "cpu": 79.5,
        "case": 72
      }
    }
  },
  "products": [
    {
      "name": "Hammer",
      "sku": 738594937
    },
    {
      "name": "Nail",
      "sku": 284758393,
      "color": "gray"
    }
  ]
}

Output ready to copy.

Use this to convert TOML config into JSON for APIs, tooling, and validation.

Tip: Useful for config files (TOML) and APIs/tooling (JSON). Click Example to see a working input.

Conversion runs locally in your browser. Nothing is uploaded or stored.

How It Works

TOML and JSON represent the same kinds of data (objects, arrays, numbers, strings, booleans) but are used in different places: TOML is common for configuration files and JSON is common for APIs and tooling.

This converter parses the input on the left, builds a structured object, and outputs the equivalent format on the right with readable formatting you can copy.

TOML → JSON: Convert config-style TOML into strict JSON for tools and APIs.
JSON → TOML: Convert JSON objects into TOML sections and values for config files.
Local conversion: Runs in your browser, so config data stays on your device.

When to Use a TOML ↔ JSON Converter

Use this when you’re moving settings between systems, preparing documentation examples, or debugging configuration values across environments.

It’s especially helpful when a tool expects JSON but your project stores config in TOML (or the other way around).

Tooling: Turn TOML settings into JSON for validators and scripts.
Docs: Produce clean examples in both formats for teams and projects.
Debugging: Spot structure issues by viewing the same data in another format.

FAQ

Does this converter upload my data?

No. Conversion runs locally in your browser and nothing is uploaded or stored.

What TOML features are supported?

Common TOML structures are supported (tables, arrays, inline tables, arrays of tables). Highly advanced TOML edge cases may not convert perfectly.

Why does my TOML/JSON fail to convert?

Conversion requires valid syntax. For JSON, make sure it’s strict JSON (double quotes). For TOML, ensure keys and values follow TOML formatting rules.

Will formatting be preserved exactly?

No. Conversion focuses on correctness and readability, so whitespace and formatting may change in the output.

Is this good for configuration files?

Yes. It’s designed for day-to-day config work: converting examples, debugging config values, and translating settings between tools.

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