JSON Validator

Check, validate, and beautify your JSON data online.

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JSON Validator
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Enter some JSON code to validate and format it.
Validate & Format Open JSON File... Copy Formatted Clear Sample

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About the JSON Validator Tool

Our JSON Validator is a two-in-one tool we built to make working with JSON data easier. JSON (JavaScript Object Notation) is everywhere on the web, but it has very strict syntax rules where a single missing comma or quote can make the whole file invalid. This tool helps you instantly find those kinds of errors.

Beyond just validating, our tool also beautifies your JSON. If your code is valid, it will automatically format it with consistent indentation and spacing, making it much easier for you to read and understand. It's perfect for debugging API responses or just cleaning up your configuration files.

How It Works

  • Paste your JSON code into the input box on the left, or open a .json file.
  • Click the "Validate & Format" button.
  • If your JSON is valid, a beautified version will appear in the output box on the right, and you'll see a success message.
  • If there's a syntax error, a helpful message will appear below, explaining the problem and its location.
  • You can click on the error message to jump directly to the problem in your code.

Frequently Asked Questions

What is JSON?

JSON (JavaScript Object Notation) is a lightweight, text-based format for storing and transporting data. It is easy for humans to read and for computers to parse. It's the most common format used for sending data between a web server and a web browser or mobile app.

Why is it important to validate JSON?

JSON has a very strict syntax. A single misplaced comma, a missing quote, or a trailing comma can make an entire file invalid. Validating your JSON ensures that it can be correctly read by the application or service that needs to use it, preventing bugs and saving you a lot of debugging time.

What does "prettifying" or "formatting" JSON do?

JSON data is often sent in a compressed, single-line format to save space. "Prettifying" (or formatting) adds line breaks and indentation to the code. This doesn't change the data itself, but it makes the structure clear and easy for developers to read and understand.

What are the most common JSON errors?

The most common errors are simple syntax mistakes. These include having a trailing comma after the last item in a list or object, using single quotes instead of double quotes for keys and string values, or forgetting to put quotes around property keys.

Is my data private when using this tool?

Yes, your data is 100% private. This tool operates entirely within your web browser. The JSON you paste is processed on your computer and is never sent to our servers. Your information remains completely secure and confidential.

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