JSON5 Validator
Validate JSON5 and re-emit it as pretty JSON
About
Validate JSON5 documents (JSON with comments, trailing commas, unquoted keys and single-quoted strings) and re-emit them as pretty-printed JSON. Useful for config files (tsconfig, eslint) and modern JSON5 configs. Runs in your browser.
About this tool
Validate and format JSON5 documents — comments, trailing commas, unquoted keys. Free online JSON5 validator — no signup, runs in your browser. JSON5 Validator runs in the browser on DevTools. There is no signup, and your input stays on this device unless the tool explicitly performs a live network lookup.
What this tool does not do
- JSON5 Validator is a free in-browser utility, not a hosted API. It does not keep server-side history and is not a substitute for production verification in your own stack.
How do I use this tool?
How do I use JSON5 Validator?
Open JSON5 Validator, enter or paste your input, and copy the result. The page works without an account.
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