JSON Formatter & Validator
Format, validate, unstringify, search, and navigate JSON in a private tree workspace.
Processed locally in your browserLoading JSON workspace…
How to use JSON Formatter & Validator
- Paste JSON or open a JSON file, up to 1 MB.
- Format, minify, or decode a JSON-string layer. Use the tree, search, breadcrumbs, and keyboard arrows to navigate.
- Review validation warnings and copy the selected value/path or download JSON.
Useful things to know
Strict JSON only: no comments or trailing commas. Duplicate keys and unsafe integer values produce warnings. Formatting and minifying preserve numeric literals rather than rounding them. Tree rendering is paged; maximum depth 128 and 50,000 nodes. Unstringify only decodes valid JSON string layers containing JSON. No code is evaluated or uploaded.
Is JSON Formatter & Validator free, and how is my privacy handled?
Yes. JSON Formatter & Validator is free to use without registration. Tool inputs are processed in your browser rather than uploaded to our servers. Optional usage analytics follows your cookie preferences; it does not receive your files or tool inputs. Keep your browser updated and review results before sharing.