JSON Formatter
Format, validate, explore, and minify JSON.
To format JSON online, paste it into the box above and click Format — this JSON beautifier and validator pretty-prints it into a collapsible tree (or a plain-text view at 2 spaces, 4 spaces, or tabs), and Minify collapses it back to one compact line. It all runs in your browser, so nothing is uploaded and there is no sign-up.
Read the guide: JSON vs. CSV vs. XML: Which Data Format to Use WhenAbout the JSON Formatter
Paste raw or messy JSON and explore it as a collapsible tree: fold and unfold objects and arrays, copy any individual value or subtree with one click, and search across every key and value to jump straight to what you need. Prefer plain text? Switch to Text view for the fully formatted JSON as selectable, copyable text — honouring your indent and sort-keys options. If the JSON is invalid, the formatter points to the exact line and column of the error.
Everything runs in your browser, so your data is never sent to a server. Format, validate, explore, copy, and minify without any tool ever seeing your JSON.
How to use it
- 1Paste your JSON. Drop raw JSON into the input box.
- 2Format. Click Format to get an interactive, collapsible tree.
- 3Explore. Fold nodes, copy any value, or search keys and values. Use Minify for a compact single line.
Frequently asked questions
How do I format JSON online?+
Paste your JSON into the box above and click Format. The beautifier validates it and lays it out as an indented, collapsible tree; switch to Text view for pretty-printed JSON at 2 spaces, 4 spaces, or tab indentation, then copy or download it. Everything happens in your browser.
How do I minify JSON?+
Paste your JSON and click Minify to strip every space and line break, leaving a single compact line ready to copy. Tick Sort keys first if you also want the object keys ordered alphabetically before minifying.
Can I collapse individual JSON fields?+
Yes. After formatting, every object and array has a toggle — click it to fold or unfold that node. Use Expand all / Collapse all to do it in bulk.
How do I copy a single value?+
Hover over any key/value row and click the copy icon. For a string or number it copies the raw value; for an object or array it copies that subtree as pretty-printed JSON.
Can I search inside large JSON?+
Yes. Type in the search box and the tree filters to matching keys and values, auto-expanding the paths to each match and highlighting them, with a live match count.
Can I get the formatted JSON as plain text?+
Yes. After formatting, switch to Text view for the full JSON as selectable, copyable text — it respects your indent size and sort-keys options. Select it directly or use the Copy button, and the tree view stays one click away.
How do I fix a JSON syntax error?+
Paste your JSON and click Format. If it is invalid, the tool shows the error plus the line and column where parsing failed — usually a missing comma, quote, or bracket.
Does it keep very large numbers exact?+
Formatting uses the browser’s native JSON engine, which stores numbers as IEEE-754 doubles. Integers beyond 2^53 (about 16 digits) — such as some 64-bit IDs or snowflake IDs — can be rounded. The tool shows a warning when it detects such a value; if you need those preserved exactly, keep them as JSON strings.
Is my JSON sent anywhere?+
No. Parsing, formatting, and searching happen entirely in your browser. Your data never leaves your device.
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