Format, validate, prettify, and parse raw JSON data.
How to Use JSON Formatter & Validator
Paste your raw or minified JSON into the input editor on the left.
Pick a tab size (2, 4, or 8 spaces) from the dropdown above the editor.
Click "Format" to pretty-print it, or "Minify" to collapse it to one line - both update the read-only output pane instantly.
Click "Copy Result" to grab the formatted JSON, or "Validate" to check syntax without changing the layout.
Key Features & Practical Use Cases
Prettifying raw, single-line JSON data into a clean tree view to debug application codes.
Validating JSON formats to verify nested brackets or key-value commas syntax.
Converting API payload blocks into structured indentations for code records.
Frequently Asked Questions
Does this tell me exactly where my JSON is broken?
Yes - clicking "Validate" or "Format" on invalid JSON reports a parse error so you can spot the bad bracket, comma, or quote.
Can I minify JSON instead of formatting it?
Yes, there's a dedicated "Minify" button next to "Format" that collapses your JSON to a single compact line.
Is there a file size limit?
No hard limit is enforced - since parsing happens in your browser, very large files (tens of MB) may just take a moment longer depending on your device.
About OneClickly
OneClickly offers 100+ premium online tools for PDF operations, image compression and conversion, text utilities, calculators, and developer tools. All tools run 100% in your browser - no file uploads, no data collection, maximum privacy guaranteed.