What TOML files can I validate?

Any TOML file: Cargo.toml (Rust), pyproject.toml (Python), config.toml (Hugo), and any custom TOML configuration you are writing.

What does the JSON preview show?

It shows the data structure the TOML parses to — helpful for confirming section names, array shapes, and nested keys before using the file in production.

What errors are reported?

Syntax errors such as missing quotes, duplicate keys in the same section, invalid date/time formats, and mismatched brackets are all caught with a plain-English description.

TOML Validator

Validate TOML syntax and preview the parsed JSON representation.

$toml

lines

0 chars1 lines

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FAQ

What TOML files can I validate?: Any TOML file: Cargo.toml (Rust), pyproject.toml (Python), config.toml (Hugo), and any custom TOML configuration you are writing.
What does the JSON preview show?: It shows the data structure the TOML parses to — helpful for confirming section names, array shapes, and nested keys before using the file in production.
What errors are reported?: Syntax errors such as missing quotes, duplicate keys in the same section, invalid date/time formats, and mismatched brackets are all caught with a plain-English description.

Paste TOML content and validate its syntax. If valid, the parsed JSON structure is displayed for easy inspection. If invalid, the error location and description are shown. Supports Cargo.toml, pyproject.toml, and any other TOML configuration file.