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JSON Formatter

Validate, format, or minify JSON without changing large numbers.

Workspace⌁ Processed on your device

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Processed on your device

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How it works

Paste JSON and choose Format, Minify or Validate. If an error appears, check its line and column, correct the input and try again.

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Example

{"ok":true,"id":9007199254740993} → JSON (2 spaces)
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When to use this tool

Read an API response while preserving a long numeric identifier.

Supported formats & limits

JSON: up to 5 MiB, strict syntax, original numeric tokens preserved. URL decoding rejects invalid escapes and UTF-8. Generated UUIDs are version 4. Inputs are never executed or visited.

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Good to know

What happens when I change the input?

An edited input needs a new result. Run the action again; previous download links are removed so you cannot mistake an old output for the current one.

Are my files uploaded?

Your files and pasted content are processed in temporary browser memory and are not uploaded for processing. App preferences store only tool IDs, language and theme. There are no accounts, ads or automatic error reports. Closing the page discards your workspace; download results you want to keep. Production pages use Google Analytics for visit statistics; see the Privacy page for details.