JSON5 Formatter
Format JSON5 with comments and trailing commas
JSON5 Formatter is a free online tool from BrowserUtils that format json5 with comments and trailing commas. It runs entirely in your browser — your data never leaves your device. No account required.
How to use JSON5 Formatter
- 1 Paste or type your input into the editor above.
- 2 The tool processes your data instantly — right in your browser, with nothing sent to a server.
- 3 Copy the result with one click or continue editing your input.
About JSON5 Formatter
Free online JSON5 formatter and beautifier. Format JSON5 documents that include comments, trailing commas, and unquoted keys. This tool runs entirely in your browser — your data is never sent to a server. Just paste your input, get instant results, and copy with one click. No sign-up or installation required.
JSON5 Formatter specs
- Runtime
- 100% client-side (browser)
- Cost
- Free — no account, no rate limits, no usage caps
- Browser support
- Chrome 90+, Firefox 88+, Safari 14+, Edge 90+
- Part of
- 299 developer tools on BrowserUtils (100% client-side)
Questions
What is JSON5 and how is it different from JSON?
JSON5 is an extension of JSON that allows comments (single and multi-line), trailing commas, unquoted keys, single-quoted strings, and other conveniences. This formatter handles all these features while producing clean, indented output.
Can I use this to format regular JSON too?
Yes, since JSON is a valid subset of JSON5, you can use this formatter for standard JSON files as well. It will format them with proper indentation while preserving any JSON5 features present.
Does the JSON5 formatter preserve comments?
Yes, both single-line (//) and multi-line (/* */) comments are preserved in the formatted output, which is one of the main advantages of JSON5 over standard JSON.
Where is JSON5 commonly used?
JSON5 is used in configuration files where comments are helpful, such as Babel configs, ESLint configs, and VS Code settings files. It provides the structure of JSON with the readability of a more forgiving syntax.
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