TOML to JSON Converter

Transform TOML configuration into JSON format

Input TOML
JSON Output
Click "Convert to JSON" to see result

🔧 Related Tools

What is TOML to JSON Conversion?

TOML (Tom's Obvious, Minimal Language) is a configuration file format known for its readability. JSON (JavaScript Object Notation) is a lightweight data interchange format widely used in APIs and web applications. Converting TOML to JSON allows you to take human‑friendly configuration files and use them in systems that expect JSON input.

This tool transforms TOML structures into valid JSON. It handles tables, arrays, and primitive types according to the TOML 1.0 specification. The output is formatted JSON ready for use in APIs, data exchange, or JavaScript applications.

All processing is done locally in your browser – your data never leaves your device.

How to Use

Step 1: Paste your TOML into the input area. You can use the sample TOML as a guide.
Step 2: Click "Convert to JSON". The tool validates the TOML and generates the corresponding JSON.
Step 3: If the TOML is invalid, you'll see an error message.
Step 4: Copy the JSON output using the "Copy JSON" button.

The converter follows TOML 1.0 syntax, supporting tables, arrays of tables, inline tables, and all data types.

Examples

Input TOML:

name = "Alice"
age = 25
active = true
Output JSON:
{"name":"Alice","age":25,"active":true}
Input TOML with table:
[database]
server = "localhost"
ports = [8001, 8002]
Output JSON:
{"database":{"server":"localhost","ports":[8001,8002]}}

Who Uses TOML to JSON Converters?

  • Web Developers – using TOML configs in JavaScript applications.
  • API Developers – converting TOML configs to JSON for API payloads.
  • DevOps Engineers – transforming configuration formats.
  • Data Scientists – converting TOML experiment configs to JSON.
  • System Administrators – migrating config files between formats.

Pro Tips

  • Ensure your TOML follows the specification (no tabs for indentation, proper escaping).
  • Arrays of tables become arrays of objects in JSON.
  • Dates in TOML (e.g., 1979-05-27) are converted to strings in JSON.
  • Use the copy button to quickly paste the JSON into your application.
  • The output is formatted with 2‑space indentation for readability.

Frequently Asked Questions

Does it support all TOML 1.0 features?
Yes, the converter supports tables, arrays, inline tables, arrays of tables, and all primitive data types (strings, integers, floats, booleans, dates).
How are dates handled?
TOML dates are converted to strings in JSON (e.g., "1979-05-27"). JSON does not have a native date type.
What about comments in TOML?
Comments are ignored during conversion and do not appear in the JSON output.
Can I convert JSON back to TOML?
Yes, use the JSON to TOML converter (see related tools).
Is my data sent to a server?
No, all conversion happens locally in your browser.
What about inline tables?
Inline tables are converted to nested JSON objects correctly.
Does it handle multi-line strings?
Yes, multi-line strings are properly parsed and converted to JSON strings with line breaks.