Convert TOML configuration files to JSON format instantly online. Free bidirectional converter for developers. Fast, accurate conversion with real-time validation.
TOML to JSON Converter
JSON to TOML Converter
Input
Length: 0
Output
Length: 0
TOML and JSON examples
What is TOML?
TOML (Tom's Obvious, Minimal Language) is a minimal configuration file format designed to be easy to read and write due to its simple and clear semantics. Created by Tom Preston-Werner, TOML aims to be a more human-friendly alternative to formats like JSON and YAML for configuration files. It maps unambiguously to a hash table and is used by many projects including Cargo (Rust's package manager), Poetry (Python dependency manager), and various other tools.
Key Features of TOML:
Simple key-value pairs for basic configuration
Supports comments using #
Tables (sections) defined using [table_name]
Arrays defined with square brackets []
Strong typing with clear date/time formats
Nested structures using dot notation or table headers
name: John Doe
age: 30
skills[3]: Python,JavaScript,DevOps
address:
street: 123 Main St
city: Springfield
zip_code: 12345
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data-interchange format that is easy for humans to read and write while being machine-readable. It uses key-value pairs to represent data and is widely used in web applications for transmitting data between servers and clients. JSON supports various data types such as strings, numbers, booleans, arrays, objects, and null.
Key Features of JSON:
Data is represented as key-value pairs
Keys must be strings enclosed in double quotes
Arrays are enclosed in square brackets [], while objects are enclosed in curly braces {}
No support for comments
Designed to be language-independent but closely resembles JavaScript syntax
{"name":"John Doe","age":30,"skills":["Python","JavaScript","DevOps"],"address":{"street":"123 Main St","city":"Springfield","zip_code":12345}}
Frequently Asked Questions
TOML (Tom's Obvious, Minimal Language) is a minimal configuration file format designed to be easy to read and write for humans. It's widely used in projects like Rust (Cargo), Hugo, Terraform, and many modern applications. Converting TOML to JSON is useful when working with APIs, web applications, or systems that require JSON input, as JSON is the universal data interchange format supported by virtually all programming languages and platforms.
Simply paste or type your TOML configuration data into the input field. The converter automatically transforms it to JSON format in real-time as you type-no button clicks needed for conversion. Once complete, click the 'Copy to clipboard' button to copy the JSON output. If your TOML input contains syntax errors, an error message will appear with specific details about what's wrong and where the issue is located in your code.
Yes, this TOML to JSON converter is completely free with no limitations. You can convert configuration files of any size, perform unlimited conversions, and access all features without registration or payment. The tool works entirely in your browser for maximum speed and privacy, with no server uploads required.
TOML is the standard configuration format for many popular tools including Rust's Cargo package manager, Hugo static site generator, Terraform infrastructure tool, Caddy web server, and Pelican. It's also widely used in Python projects, Go applications, and modern DevOps tooling. TOML has become the preferred alternative to INI files due to its clear specification and lack of ambiguity in parsing.
TOML is optimized for human readability in configuration files with features like comments, multiline strings, and intuitive date/time formats. JSON is optimized for machine parsing and data interchange with strict syntax rules. TOML uses key-value pairs without quotes on keys and supports sections with [headers], while JSON requires quotes around all strings and uses nested braces. Both formats map to the same data structures, making conversion between them straightforward.
Yes, this converter fully supports all TOML v1.0 specification features including tables, inline tables, arrays, arrays of tables, integers, floats, booleans, dates, times, datetimes with timezone offsets, multiline strings, literal strings, and nested data structures. All TOML data types are accurately converted to their JSON equivalents while preserving data integrity and structure.
Learn the differences between TOML and JSON formats. Discover when to use each, how to convert between them, and why developers prefer TOML for configuration files.