JSON to TOML Converter

Table of Contents

Transform your JSON data into TOML format with this straightforward JSON to TOML converter. This tool makes it easy to convert structured JSON documents into TOML (Tom’s Obvious, Minimal Language), a configuration file format that’s more human-friendly and readable.

What is TOML?

TOML (Tom’s Obvious, Minimal Language) is a configuration file format designed to be easy for humans to read and write while remaining simple to parse for applications. Created in 2013 by Tom Preston-Werner (co-founder of GitHub), TOML has gained popularity as an alternative to formats like JSON, YAML, and INI.

Why Convert JSON to TOML?

Converting JSON to TOML offers several advantages:

• Better readability for configuration files
• Clear hierarchy representation with dot notation
• Support for comments, which JSON lacks
• Native support for dates and times
• Multi-line strings without escape sequences

Key Differences Between JSON and TOML

How to Use

1. Enter or paste your JSON data into the input box
2. Review your converted TOML in the output area
3. Copy the TOML output using the copy button

Common Applications for TOML

TOML has become widely used in various software projects and environments:

• Rust Cargo package manager – Uses TOML for project configuration
• Go module system – Uses TOML for go.mod files
• Python projects – Used in pyproject.toml for package configuration
• Application configurations – Growing use in various applications
• Deployment configurations – For containerized and cloud environments

TOML Syntax Examples

Here’s how common JSON structures are represented in TOML:

Basic Key-Value Pairs

{
  "name": "John Doe",
  "age": 30,
  "is_admin": true
}

name = "John Doe"
age = 30
is_admin = true

Nested Objects

{
  "database": {
    "host": "localhost",
    "port": 5432,
    "username": "user"
  }
}

[database]
host = "localhost"
port = 5432
username = "user"

Arrays

{
  "colors": ["red", "green", "blue"]
}

colors = ["red", "green", "blue"]

Benefits of This Converter

• Easy migration – Move from JSON to TOML without manual rewriting
• Preserves data structure – Maintains hierarchical relationships
• Handles complex JSON – Converts nested objects and arrays properly
• Browser-based processing – No data sent to servers, keeping your data private

Limitations

While this converter handles most JSON-to-TOML conversions well, there are a few limitations to be aware of:

• Very large JSON files might slow down browser performance
• Some complex nested structures might require manual review
• Invalid JSON input will cause conversion errors