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JSON Validator & Formatter

Validate, format, and beautify your JSON data with this powerful tool. Easily identify errors and make your JSON more readable.

Validate JSON
Format & Beautify
Error Detection

Formatting Options

JSON Input

Validated JSON will appear here

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About Our JSON Validator & Formatter

About JSON Validator & Formatter

The JSON Validator & Formatter is a powerful tool designed to help developers validate, format, and beautify JSON data. Whether you're debugging an API response, cleaning up configuration files, or just need to make your JSON more readable, this tool has you covered.

What is JSON?

JSON (JavaScript Object Notation) is a lightweight data interchange format that is easy for humans to read and write and easy for machines to parse and generate. It is based on a subset of JavaScript language and is commonly used for transmitting data in web applications.

Key Features

  • JSON Validation - Instantly check if your JSON is valid and see detailed error messages if it's not.
  • Pretty Formatting - Make your JSON more readable with customizable indentation.
  • Compact Mode - Remove all whitespace for minified JSON.
  • Sort Keys - Alphabetically sort object keys for better organization.
  • Error Highlighting - Quickly identify and fix syntax errors with line and column information.
  • File Upload - Drag and drop or upload JSON files directly.
  • Copy & Download - Easily copy formatted JSON to clipboard or download as a file.
  • History - Keep track of your recent validations for quick access.

Common JSON Errors

When working with JSON, you might encounter these common syntax errors:

  • Missing Commas - Forgetting to separate properties with commas.
  • Trailing Commas - Adding a comma after the last property (not allowed in JSON).
  • Single Quotes - Using single quotes instead of double quotes for strings.
  • Unquoted Keys - Not enclosing property names in quotes.
  • Comments - Adding comments (JSON doesn't support comments).

How to Use

  1. Paste your JSON into the input area or upload a JSON file.
  2. Customize the formatting options if needed.
  3. Click "Validate & Format" to process your JSON.
  4. If valid, you'll see the formatted JSON in the output area.
  5. If invalid, you'll see an error message explaining what went wrong.
  6. Use the copy or download buttons to save your formatted JSON.

This tool runs entirely in your browser, so your data never leaves your computer. It's fast, secure, and works offline once loaded.

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Frequently Asked Questions

What is the difference between JSON and JavaScript objects?

While JSON is based on JavaScript object syntax, there are key differences: JSON requires double quotes for strings and property names, doesn't support functions or comments, and doesn't allow trailing commas. JavaScript objects are more flexible and can include methods, computed properties, and more.

Is my data secure when using this tool?

Yes, this tool runs entirely in your browser. Your JSON data is never sent to our servers or stored anywhere except in your browser's local storage if you use the history feature. You can even use this tool offline once the page has loaded.

Why would I need to format JSON?

Formatting JSON makes it more readable for humans while preserving its structure. This is especially useful when debugging, documenting, or sharing JSON data. Properly formatted JSON is easier to navigate, understand, and edit.

What does "Sort Keys" do?

The "Sort Keys" option alphabetically sorts all object keys in your JSON. This can make large JSON structures more navigable and consistent, especially when comparing different JSON objects. It doesn't change the data itself, just the order of properties.

Can this tool handle large JSON files?

Yes, this tool can handle reasonably large JSON files, but performance may vary depending on your device. For extremely large files (several MB), you might experience some lag during validation and formatting. If you're working with very large JSON regularly, consider using command-line tools like jq.

How do I fix common JSON errors?

For missing commas, add commas between properties. For trailing commas, remove the comma after the last property. Replace single quotes with double quotes. Add double quotes around property names. Remove any comments. The error messages provided by this tool will help you locate and fix these issues.

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