Does this tool upload my JSON?

No. Formatting and validation happen entirely in your browser, so your JSON does not leave your device.

What kinds of JSON errors can it detect?

It catches invalid JSON syntax such as trailing commas, missing quotes, unexpected tokens, and incomplete structures.

Yes. Use the Minify action to collapse valid JSON into a compact single-line output that is easy to copy.

Format, minify, validate, and copy JSON directly in your browser.

Browser-side Format JSON Validate Syntax Detailed Errors Minify JSON One-click Copy

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Browser-side

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Ready

Paste JSON and choose an action.

Fast and reliable JSON formatting and validation.

Browser-side

All processing stays in your browser

Format JSON

Beautify JSON with consistent indentation

Validate Syntax

Validate syntax before saving or sharing

Detailed Errors

Show parse errors with line and column details

Minify JSON

Compress JSON into a single line

One-click Copy

Copy clean output with one click

A practical guide to formatting, validating, and cleaning JSON online without installing extra software.

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Find answers to the most common questions.