Read minified API responses
Paste a one-line API payload and instantly get readable, indented JSON you can scan.
Free · client-side · no sign-up
JSON Formatter & Beautifier
Paste messy or minified JSON and get clean, indented, readable output instantly. Validation, tree view, minify, copy and download are all built in — and your data never leaves the browser.
Use cases
Clean up config files
Normalize indentation and formatting before committing JSON config to your repo.
Prepare JSON for docs
Produce tidy, consistently formatted snippets to drop into documentation or tickets.
Inspect deeply nested data
Switch to the tree view to collapse and explore large, nested structures.
Instant beautify
Formatting happens as you type — no button to press. Choose 2-space, 4-space or tab indentation.
Validation as you type
Invalid JSON is flagged inline with the exact line and column so you can fix it fast.
Tree view
Switch to a collapsible tree to explore deeply nested structures and copy any node's JSONPath.
Minify
Collapse JSON to the smallest possible size with a single click.
Copy & download
Copy the result to your clipboard or download it as a .json file.
100% private
Everything runs in your browser. Nothing is uploaded to a server, ever.
Example
Messy input
{"name":"JsonLab","tags":["json","tools"],"nested":{"a":1,"b":2}}Beautified output
{
"name": "JsonLab",
"tags": ["json", "tools"],
"nested": {
"a": 1,
"b": 2
}
}How to use it
- 1Open the formatter and paste your JSON into the left editor.
- 2It is formatted and validated instantly in the right pane.
- 3Toggle the tree view, minify, then copy or download the result.
Frequently asked questions
Is my JSON uploaded anywhere?
No. The formatter runs entirely in your browser using client-side JavaScript, so your JSON never leaves your device.
Is there a size limit?
There is no hard limit. The editor handles large documents smoothly since all processing is local.
Does it also validate JSON?
Yes — invalid JSON is highlighted inline with the line and column of the error as you type.
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JSON Diff Tool
Compare two JSON documents and highlight everything that was added, removed or changed.
Ready to go?
No sign-up, no uploads — everything runs in your browser.