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JSON Formatter

Read minified JSON, see parse errors, and tidy the document in this tab. Nothing is uploaded.

Processed in your browser

Format, minify, and validate run in this browser. We do not send the document body.
Format, minify, and validate finish in this browser. Pasted text and files stay on this device and are not uploaded.

Drop a JSON file here, or paste below.

Advanced options

Paste JSON or load a file, then format.

Formatted JSON will appear here.

Features

Format

Pretty-print JSON with 2 or 4 space indent.

Minify

Strip insignificant whitespace into a single line.

Validate

Check standard JSON and return a readable parse error.

Local files

Load and download on this device. Files are not uploaded.

How to use

  1. Paste JSON or drop a local file.
  2. Choose Format. Minify and Validate are available when you need them.
  3. Copy the result or download it.

Why this tool

Runs in the browser

Core work finishes in this tab.

No upload

Pasted text and local files are not sent away for processing.

Free, no account

The core path has no signup wall.

Immediate

There is no upload-and-wait queue.

10 languages

The same tool ships in ten languages.

Readable failures

Broken input returns a reason, not a blank screen.

FAQ

Is my JSON uploaded?
No. Format, minify, and validate all run in this browser.
Can I use JSON with comments?
No. Only standard JSON (JSON.parse). Comments and trailing commas are errors.
How large can the input be?
Up to your device memory. Tens of MB may freeze the tab.
Will key order change?
Usually not. We rely on typical JSON.parse insertion order.

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