Tolinx · text
JSON Formatter & Validator
Format, minify, and validate JSON.
Format, minify, and validate JSON locally with instant error feedback.
This JSON utility is built for marketers, product managers, and engineers who need trustworthy previews without opening an IDE. Switch between pretty-print mode, a compact minified string, or a strict validator that pinpoints syntax issues such as misplaced commas or missing braces.
Unicode handling ensures multilingual payloads stay intact, so you can paste localized strings, emoji, or special symbols without losing fidelity. Results are easy to copy into documentation, configuration files, or API consoles.
Because the tool runs entirely in the browser, sensitive tokens or staging data never leave your device. Pair it with the whitespace cleaner to normalize pasted text before validating.
How to use
Paste your JSON into the editor. Choose “Format” to apply indentation and line breaks, or “Minify” to collapse everything into a single line for transport. Hit “Validate JSON” whenever you need to confirm the syntax. Success and error states show below the editor, including the index of the first issue.
Use “Copy output” to place the formatted or minified result on your clipboard. Overwrite the input to start a new validation run.
FAQ
How large of a payload can it handle?
It is optimized for typical configuration files and responses up to a few hundred kilobytes. Larger payloads may take longer but still run locally.
Does it reorder keys?
No. The formatter preserves key order to avoid unintended side effects. We focus on indentation and spacing only.
Usage ideas
Tracking plans
Format analytics schemas before sharing them with data engineers.
API debugging
Minify a payload before sending it through a webhook or validate a response captured from staging.
Sample input
{"language":"en","tool":"json-formatter"}