TOML ↔ JSON Converter

Convert TOML to JSON and JSON to TOML instantly. Useful for configuration files, tooling, and everyday 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 the TOML ↔ JSON Converter works

TOML and JSON can represent the same underlying data structures, but they are used in different contexts. TOML is popular for human-edited configuration files, while JSON is common for APIs, tooling, and data exchange.

This converter parses the input format into a structured object and then serializes it into the target format with clean, readable output.

TOML → JSON: Convert config-style TOML into strict JSON for tools and APIs.
JSON → TOML: Convert JSON objects into TOML sections and values.
Local execution: All parsing and conversion happen in your browser.

When to use a TOML ↔ JSON converter

This tool is useful when moving settings between systems, adapting example configs, or troubleshooting configuration issues by viewing data in another format.

Seeing the same structure represented differently often makes nesting problems or type issues easier to spot.

Tooling: Convert TOML configs into JSON for validators, scripts, and CI tools.
Documentation: Provide examples in both formats for different audiences.
Debugging: Reveal structural issues by switching formats.

Common pitfalls when converting configs

While TOML and JSON map closely, there are small differences that matter in practice. Comments, key ordering, and formatting styles don’t carry over between formats.

It’s always a good idea to review the converted output before committing it to a production config file.

Comments: TOML comments are not preserved when converting to JSON.
Formatting: Whitespace and ordering may change during conversion.
Validation: Always validate the output with the target tool or runtime.

FAQ

Does this converter upload my data?

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

What TOML features are supported?

Common TOML features like tables, arrays, inline tables, and arrays of tables are supported. Very advanced or ambiguous edge cases may require small manual tweaks.

Why does my TOML or JSON fail to convert?

The input must be valid. JSON must use strict JSON syntax (double quotes, no comments). TOML must follow proper key, value, and table formatting.

Will formatting be preserved exactly?

No. The converter focuses on correct structure and readability, so whitespace, ordering, and comments may change.

Is this suitable for real configuration files?

Yes. It’s designed for everyday config work like translating examples, debugging values, and adapting settings between tools.