Your data is never sent to a server or stored anywhere. All processing happens in your browser.

TOML to JSON Converter

Conversion Mode
Output 
 
 
How to Use
 
 
  1. Select the conversion direction: TOML to JSON or JSON to TOML.
  2. Paste or type your data in the input area.
  3. The converted output updates in real time.
  4. Copy the output with the copy button.
 
What is TOML?
 
 
TOML (Tom's Obvious Minimal Language) is a configuration file format designed to be easy to read due to clear semantics. It is commonly used in Rust projects (Cargo.toml), Python (pyproject.toml), and other tools. TOML supports key-value pairs, tables (sections), arrays, and typed values (strings, integers, floats, booleans, dates).
 
TOML vs JSON
 
 
  • TOML uses [section] headers for nesting; JSON uses nested braces.
  • TOML supports comments (#); JSON does not.
  • TOML has native date/time types; JSON represents them as strings.
  • Both are widely supported for configuration and data exchange.
 
Use Cases
 
 
  • Rust and Go projects: Convert Cargo.toml or Go module configurations to JSON for programmatic processing or API consumption.
  • CI/CD configuration: Transform TOML-based CI configs into JSON for tools and scripts that only accept JSON input.
  • Configuration migration: Move settings between systems that use different formats (e.g., migrating from a TOML config to a JSON-based microservice).
  • Data inspection: Convert TOML to JSON for use with JSON-aware tools like jq, JSON viewers, or API testing platforms.
  • Documentation: Generate JSON examples from TOML source files for technical documentation.
 
Tips
 
 
  • TOML comments (#) are stripped during conversion since JSON does not support comments.
  • TOML's native datetime values are converted to ISO 8601 strings in JSON.
  • Inline tables in TOML ({ key = "value" }) become nested JSON objects.
  • Array of tables ([[section]]) in TOML maps to a JSON array of objects.
  • When converting JSON to TOML, ensure numeric keys are valid TOML identifiers or quote them appropriately.
 
Privacy
 
 
All conversion happens in your browser. No data is sent to any server.
 
FAQ
 
 
When should I use TOML versus JSON?
 
TOML supports comments and [section] headers and is easy for humans to read and edit, making it well suited to config files like Cargo.toml and pyproject.toml. JSON is a data-interchange format supported natively by most tools and APIs. This tool converts between the two in both directions.
Is the config file I convert sent to a server?
 
No. Conversion between TOML and JSON runs entirely in your browser, and the data you enter is never sent to or stored on any server.
Are TOML comments preserved after conversion?
 
No. Because JSON does not support comments, TOML comments (#) are stripped when converting to JSON. The output contains only the data portion.
How are TOML dates and inline tables represented in JSON?
 
TOML's native datetime values become ISO 8601 strings. Inline tables ({ key = "value" }) become nested JSON objects, and arrays of tables ([[section]]) map to a JSON array of objects.
What should I watch out for when converting JSON to TOML?
 
Keys that are purely numeric may not be valid TOML identifiers as-is. Make sure they are quoted appropriately during conversion, and revise key names if needed.