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JSON Formatter & Validator

Format, validate and beautify messy JSON data instantly.

How to Format JSON Online

Formatting and validating JSON (JavaScript Object Notation) doesn't have to be a tedious task. Our free online JSON formatter makes it incredibly simple to read messy API responses and configuration files.

  1. Paste your code: Copy your raw, unformatted JSON data and paste it into the "Input JSON" box on the left.
  2. Click Format: Hit the "Format JSON" button. Our tool will immediately parse the data, check for errors, and indent it properly.
  3. Validate syntax: If your JSON has syntax errors (like missing quotes or trailing commas), the status indicator will highlight the issue so you can fix it.
  4. Copy the result: Once you are satisfied with the beautified JSON, click the "Copy" button to save it to your clipboard.

Why Use Our JSON Formatter?

Developers frequently encounter minified JSON strings that are impossible to read with the human eye. Finding a missing bracket or a typo in a 5,000-line minified JSON string can consume hours of debugging time.

  • 100% Privacy: This JSON formatter works entirely inside your browser. Your sensitive API data or config files are never uploaded to our servers.
  • Instant Validation: As you type or paste, the tool checks for validity. If your JSON is broken, you'll know instantly.
  • Minify Option: Working on production code? Use the "Minify" button to strip all whitespace and reduce file size before deployment.

Frequently Asked Questions

Is my JSON data safe?

Yes. EasyToolz uses local browser-side execution for the JSON Formatter. No data is transmitted across the internet, ensuring your confidential information remains secure on your machine.

What causes 'Invalid JSON' errors?

The most common causes for invalid JSON include missing quotation marks around keys, using single quotes instead of double quotes, missing commas between elements, and trailing commas at the end of an array or object.

Is there a file size limit?

Because the parsing happens in your browser's memory, you can format very large JSON files (often up to tens of megabytes) depending on your computer's RAM, without waiting for long server uploads.