Developer Tools
Validate TOML for common syntax issues in configs, package files, and app settings.
Use this TOML validator to check whether TOML is structurally valid before using it in apps, package files, scripts, or configuration workflows. It is useful when broken TOML can cause config errors, startup failures, or confusing debugging sessions.
Use this TOML validator to check whether TOML is structurally valid before using it in apps, package files, scripts, or configuration workflows. It is useful when broken TOML can cause config errors, startup failures, or confusing debugging sessions.
Use toml validator when you need a fast browser-based result without extra setup. It works well for quick checks, one-off tasks, and routine formatting or calculation work.
Read step-by-step usage guidance, best practices, and common mistakes.
See common questions and answers about input, output, and tool usage.
Review practical input and output examples before running the tool.
Find similar and supporting tools for adjacent actions and follow-up tasks.
Input
title = "Demo" enabled = true
Output
Valid TOML.
A simple TOML file with valid assignments passes validation.
Input
[server port = 3000
Output
Invalid TOML.
Broken section syntax should fail validation.
Fix: Make sure every section header is complete, for example [server] instead of [server.
Fix: Check commas, brackets, and value quoting inside arrays.
Fix: Use TOML Formatter when readability is the main goal.
A TOML validator checks whether TOML syntax is valid and structurally readable by a TOML parser.
It helps catch syntax problems before broken TOML causes config or application errors.
TOML Validator checks correctness, while TOML Formatter improves readability.
Yes. TOML can be syntactically valid but still contain incorrect settings for your app.
Use TOML to JSON after validation when you want to inspect or reuse the data in JSON-based tools or workflows.