How do I format JSON online?

Paste your JSON into the input area and click Format. The tool pretty-prints your JSON with 2-space indentation instantly in your browser.

How do I validate JSON?

Click the Validate button after pasting your JSON. If valid, you will see a success message. If invalid, the tool shows the error location and message.

What is JSON minification?

Minification removes all unnecessary whitespace and line breaks from JSON to reduce file size. Click Minify to compress your JSON into a single line.

What does a JSON parse error mean?

A parse error means the JSON has invalid syntax, such as missing quotes, trailing commas, or unescaped characters. The formatter highlights the approximate position.

How large of a JSON file can I format?

You can format JSON files up to 1MB. Larger files may cause the browser to slow down or crash.

Is my JSON data safe?

Yes. All formatting, validation, and minification happens locally in your browser. No data is uploaded to any server.

What is the difference between JSON and JavaScript?

JSON is a lightweight data-interchange format. It is a subset of JavaScript syntax but is language-independent. JSON uses double quotes for strings and has no functions or comments.

How do I view JSON in a tree structure?

Click Tree View after formatting your JSON. The tool renders a collapsible nested structure so you can explore objects and arrays interactively.

Can I upload a JSON file?

Yes. Click the Upload button and select a .json file. The file content will be loaded into the input area automatically.

How do I download formatted JSON?

After formatting or minifying, click the Download button to save the output as a .json file to your device.

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JSON Formatter & Validator

Format, validate, minify, and explore JSON instantly. Free online tool for developers.

Input

Output

Frequently Asked Questions

How do I format JSON online?: Paste your JSON into the input area and click Format. The tool pretty-prints your JSON with 2-space indentation instantly in your browser.
How do I validate JSON?: Click the Validate button after pasting your JSON. If valid, you will see a success message. If invalid, the tool shows the error location and message.
What is JSON minification?: Minification removes all unnecessary whitespace and line breaks from JSON to reduce file size. Click Minify to compress your JSON into a single line.
What does a JSON parse error mean?: A parse error means the JSON has invalid syntax, such as missing quotes, trailing commas, or unescaped characters. The formatter highlights the approximate position.
How large of a JSON file can I format?: You can format JSON files up to 1MB. Larger files may cause the browser to slow down or crash.
Is my JSON data safe?: Yes. All formatting, validation, and minification happens locally in your browser. No data is uploaded to any server.
What is the difference between JSON and JavaScript?: JSON is a lightweight data-interchange format. It is a subset of JavaScript syntax but is language-independent. JSON uses double quotes for strings and has no functions or comments.
How do I view JSON in a tree structure?: Click Tree View after formatting your JSON. The tool renders a collapsible nested structure so you can explore objects and arrays interactively.
Can I upload a JSON file?: Yes. Click the Upload button and select a .json file. The file content will be loaded into the input area automatically.
How do I download formatted JSON?: After formatting or minifying, click the Download button to save the output as a .json file to your device.