JSON Formatter & Validator
Private by design — runs entirely in your browser
Format, validate, and beautify JSON directly in your browser. The Toova JSON formatter handles any size payload, gives you clear error messages when the input is malformed, and never sends your data to a server. Drop in raw JSON, get back clean indented output you can read or copy in seconds.
Why use Toova JSON Formatter
Most online JSON formatters quietly upload your input to a server before formatting it. That is a problem when the JSON contains API keys, user records, or anything you cannot share. Toova runs entirely in your browser, so your input never leaves your device. The parser surfaces line and column numbers when something fails and gives you a clean explanation of what was expected next.
How it works
Paste or drop your JSON into the input area. The formatter parses, validates, and pretty-prints it instantly. You can choose 2-space or 4-space indentation, switch to tabs, or minify everything down to a single line. The result is copied with one click. When the input is broken, you get the exact line and column of the error along with a hint about what should come next.
100% private
Every operation runs locally in your browser. No data is uploaded, no logs are kept, and no account is needed. Open the developer tools and check the Network tab while you format — you will see zero outbound requests. That makes Toova safe for staging payloads, JWTs, customer records, and anything else you would not paste into a random web form.
Frequently Asked Questions
- Does Toova send my JSON to a server?
- No. All parsing, validation, and formatting happens in your browser. Your JSON never leaves your device, and there is no upload, no logging, and no analytics on the content itself.
- What is the maximum file size?
- There is no hard limit — only your browser memory. Files up to 50 MB format in under a second on a modern laptop. For multi-hundred-megabyte payloads, expect a brief pause while the browser parses the input.
- Does the formatter handle invalid JSON?
- Yes. When the input is malformed, the tool shows the exact line and column of the error along with a clear explanation of what was expected. You can fix the input and reformat without losing your work.
- Can I sort the keys alphabetically?
- Yes. The Sort Keys option reorders every object key alphabetically while preserving array order. This is useful when comparing two JSON files or producing a stable diff in code review.
- Is JSON5 supported?
- Yes. The formatter accepts trailing commas, single-quoted strings, and unquoted keys when JSON5 mode is enabled. The output is always valid strict JSON.
- Can I minify JSON instead of beautifying it?
- Yes. The Minify toggle strips every space and newline, producing a single-line payload. That is the format you want when sending JSON over the wire or storing it in a database column.