JSON Formatter
Format, minify and validate JSON.
How to use JSON Formatter
follow along with the steps below
1Open the tool on this page and add a JSON string.
2Adjust the options if you need to. Results update right on the page.
3Copy or download formatted or minified JSON. Nothing is uploaded, so you can repeat as often as you like.
About JSON Formatter
JSON Formatter is a free online tool from Supreme Pro. Format, minify and validate JSON. It runs in your browser, so there is nothing to install and no account to create. Developer utilities are most useful when they are fast and private, so everything runs locally.
Common uses
- Format, encode or inspect data while you code and debug
- Create values such as colors and shadows without leaving the page
- Test small ideas quickly before putting them in a project
Tips for best results
- Never paste secrets or production credentials into any online tool
- Validate the output in your own environment before you ship it
- Use the copy button to avoid typing mistakes
Features
- Lets you pretty-print, minify and validate JSON
- Free to use, no account or sign-up
- Private — runs entirely in your browser
- Works on phones, tablets and computers
Practical tips
When an API response arrives as one unreadable line, formatting it makes the structure obvious: nested objects, arrays and missing commas become easy to spot. If the validator reports an error, look just before the position it names, because a stray trailing comma or an unquoted key is usually the real cause. Minify the data again before sending it, to keep requests small.
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Quick answers about using JSON Formatter.
What is the JSON Formatter?
The JSON Formatter is a free online tool from Supreme Pro. Format, minify and validate JSON. You can use it to pretty-print, minify and validate JSON.
How do I use the JSON Formatter?
Open this page, add a JSON string in the tool above, adjust any options you want and read or download formatted or minified JSON. Everything happens on the same page, so there is nothing to install.
Is the JSON Formatter free?
Yes. The JSON Formatter is free to use and does not need an account or sign-up.
Is my data safe when I use the JSON Formatter?
Yes. The tool runs in your browser, so anything you add — such as a JSON string — is processed on your own device rather than being sent to our servers.
Does the JSON Formatter work on mobile phones?
Yes. The page is responsive and works in modern browsers on phones, tablets and computers.
Can I use the JSON Formatter offline?
Once you have opened this page, your browser can often reload it without a connection because Supreme Pro saves its core files for offline use. Open it once while online first.
Is there a limit on how much text I can use?
There is no fixed limit, but very large texts depend on the memory of your device and browser.
What are the most common JSON errors?
Trailing commas, single quotes instead of double quotes, and keys without quotes. JSON is stricter than JavaScript object syntax.
Does the formatter change my data?
No. It only changes spacing and line breaks, so keys, values and their order stay the same.
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