TOML to JSON Converter
Convert TOML (Cargo.toml, pyproject.toml) to JSON and JSON back to TOML.
Three steps, no reading required.
Paste your input
Drop text, code, or data into the input pane — from an API response, a file, anywhere.
Pick a mode
Toggle the modes above the output. The result updates instantly as you type.
Copy the result
Grab the output with Copy or Download, or fix the error shown if the input is invalid.
Try it with a sample.
title = "My App" [owner] name = "Ada" dob = 1979-05-27T07:32:00Z [database] ports = [8000, 8001, 8002] enabled = true
One direction only
- Converts TOML to JSON but not back
- Chokes on arrays of tables
- Uploads your config
Both ways, full TOML
- TOML to JSON and JSON to TOML in one page
- Tables, dotted keys, [[arrays of tables]], inline tables, multiline strings
- Dates stay as strings, since JSON has no date type
Questions worth answering upfront.
No. Conversion runs entirely in your browser. Your TOML and JSON are never uploaded, stored, or logged.
Tables, dotted keys, arrays of tables ([[...]]), inline tables, arrays (including multiline), basic and literal strings (including triple-quoted), integers, floats, booleans, and comments.
TOML datetimes, dates, and times are kept as strings in the JSON output, since JSON has no native date type.
Yes. Switch to the JSON → TOML mode to turn a JSON object into TOML, with nested objects becoming tables and arrays of objects becoming arrays of tables.
Yes. Every tool on DevUtilsNow is free to use with no account required.
A [table] header becomes a nested JSON object, an [[array of tables]] becomes an array of objects, and dotted keys like server.port nest the same way. Comments are dropped, since JSON has no comment syntax.
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Guides that pair with this tool
How to Convert TOML to JSON (and Back)
Convert TOML config to JSON and JSON to TOML — how tables, arrays of tables, inline tables, and TOML's typed values map across.
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