vtree — free TOML to JSON converter. Paste a TOML config file and get valid JSON back instantly, with dates converted to ISO 8601, entirely in your browser.
vtree converts TOML to JSON right in your browser — no account, no sign-up, and nothing you paste ever leaves your device.
Features
Convert TOML config files to JSON
Tables and arrays of tables map to nested objects and arrays
TOML dates and times convert to ISO 8601 strings
Runs entirely in the browser — no data leaves your device
Frequently asked questions
What happens to TOML dates and times?
They convert to ISO 8601 strings in the JSON output — the same lossless conversion vtree's TOML viewer uses everywhere else.
How are tables and arrays of tables handled?
A [section] becomes a nested object, and an array of tables ([[items]]) becomes a JSON array of objects — the structure carries over directly.
Why does conversion fail on my TOML?
Usually a duplicate key, or a value that mixes types within an array — TOML arrays must be uniformly typed.
Is my data uploaded anywhere?
No. The conversion runs entirely in your browser.
Is this free to use?
Yes, vtree is free with no account or sign-up required.