Free online JSON formatter and validator. Paste your JSON and instantly format it into clean readable code, minify it into a single line, or validate it to check for errors. No sign up needed, works entirely in your browser.
How to Use This JSON Formatter
Paste your JSON into the input box. Click Format to beautify it with proper indentation. Click Minify to compress it into one line. Click Validate to check if your JSON is valid without formatting it. You can also press Ctrl and Enter together on your keyboard to format instantly. Use Load Sample to try the tool with a demo JSON if you do not have any ready.
What This JSON Formatter Shows You
After formatting you get a fully syntax highlighted output with keys shown in blue, string values in green, numbers in yellow, booleans in orange and null values in purple. The tool also shows the total file size, number of lines, total number of keys and the maximum nesting depth of your JSON.
What Is JSON
JSON stands for JavaScript Object Notation. It is a lightweight text format used to store and exchange data between systems, APIs and applications. JSON is used by virtually every web application and API in the world to send and receive data. It is human readable but can become difficult to read when compressed or minified.
Why Format JSON
Raw JSON from an API or database is often compressed into a single unreadable line to save bandwidth. Formatting it adds proper indentation and line breaks so developers can read, debug and understand the structure easily. This tool formats JSON instantly with a single click.
What Is JSON Validation
JSON validation checks whether your JSON follows the correct syntax rules. A single missing comma, an extra bracket or an unquoted key will make JSON invalid and cause errors in your application. This tool tells you exactly what is wrong and where the error is so you can fix it quickly.
What Is JSON Minification
Minification removes all whitespace, line breaks and indentation from JSON to make it as small as possible. Minified JSON is used in production applications and APIs to reduce file size and speed up data transfer. This tool minifies JSON instantly with a single click.
Frequently Asked Questions
What is the difference between formatting and minifying JSON? Formatting adds indentation and line breaks to make JSON readable. Minifying removes all whitespace to make JSON as compact as possible. Both produce valid JSON — they just look different.
How do I validate JSON online? Paste your JSON into the tool above and click Validate. The tool instantly tells you whether your JSON is valid or shows you the exact error and location of the problem.
Can I format JSON with 2 spaces or tabs? Yes. Use the indent selector at the top to choose between 2 spaces, 4 spaces or tab indentation before clicking Format.
Can I download the formatted JSON? Yes. After formatting or minifying click the Download button to save the result as a .json file directly to your computer.
Is this JSON formatter free? Completely free. No sign up, no login, no limits. Works entirely in your browser with no data sent to any server.
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Last updated: March 2026 · Free tool by AllTheTools.com