JSON Formatter & Validator
Format, validate, minify and view JSON data in a beautiful tree view.
Three steps, no reading required.
Paste your input
Drop text, code, or data into the input pane — from an API response, a file, anywhere.
Pick a mode
Toggle the modes above the output. The result updates instantly as you type.
Copy the result
Grab the output with Copy or Download, or fix the error shown if the input is invalid.
Try it with a sample.
{"id":1,"name":"John Doe","email":"[email protected]","skills":["JavaScript","HTML","CSS"],"active":true}{"product":"Widget","price":19.99,"tags":["new","sale"],"stock":{"warehouse":120,"store":8}}Upload & hope
- Sends your input to a server to process it
- Asks for an account after a few free uses
- Limits input size on the free tier
Runs where you are
- Processes everything inside your browser tab
- No account, ever
- No artificial size limit
Questions worth answering upfront.
No. All formatting and validation happens entirely in your browser using JavaScript. Nothing you paste is ever sent to, stored on, or logged by any server.
Format (beautify) adds indentation and line breaks so JSON is easy to read. Minify strips all unnecessary whitespace to produce the smallest valid JSON, which is ideal for transport or storage.
There is no hard limit, but because everything runs in your browser, very large inputs (roughly over 5MB) may briefly freeze the tab while processing. For huge files a desktop tool is a better fit.
Once the page has loaded, formatting works without a network connection because the logic runs locally in your browser.
Tree View renders your JSON as a collapsible hierarchy so you can expand and explore nested objects and arrays instead of scrolling through raw text.
Yes. Every tool on DevUtilsNow is free to use with no account and no limits.
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