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JSON Formatter & Validator

Format, minify, validate, copy, and download JSON without sending it away from your device.

Format and validate JSON

Your JSON is processed locally in your browser.

Text and uploaded files are never sent to ToolNest servers.

Input

JSON source

0 characters
Upload a .json fileJSON only · Maximum 20.0 MB
Output

Processed JSON

Waiting
What it does

Make JSON easier to read and inspect

Paste, type, or upload JSON, then pretty-print it with consistent indentation, minify it for compact storage, or validate its syntax with useful error details.

How to use it

Process JSON in three steps

  1. Add JSON in the input editor or select a .json file.
  2. Choose Format, Minify, or Validate.
  3. Copy the valid output or download it as a JSON file.

Format, minify, or validate

Format

Add two-space indentation and line breaks for clear reading and review.

Minify

Remove unnecessary whitespace while preserving the JSON data.

Validate

Check syntax and receive a readable error location when the browser provides one.

Private by design

Processed entirely in your browser

A dedicated browser worker parses JSON locally so the page remains responsive. ToolNest does not upload the text or selected files to an API.

Supported content

Standard JSON with Unicode text

Use objects, arrays, strings, numbers, booleans, and null values. Unicode content such as Urdu remains readable in formatted and minified output.

Helpful answers

JSON Formatter FAQs

Is my JSON uploaded to a server?

No. ToolNest reads and processes pasted text and selected JSON files inside your browser. The content is not sent to a ToolNest processing endpoint.

What is the difference between format and minify?

Format adds indentation and line breaks for readability. Minify removes unnecessary whitespace to create a compact JSON string.

Does the validator show where an error occurred?

When the browser provides a parse position, ToolNest displays the nearby line and column or character number to help locate the problem.

Does it support Unicode and Urdu?

Yes. Valid JSON strings can contain Unicode text, including Urdu. Formatting and minifying preserve those characters.

How large can an uploaded JSON file be?

The initial browser-safety limit is 20 MB. Processing speed and available memory still depend on the device and browser.