Complete JSON Toolkit

JSON (JavaScript Object Notation) is a lightweight data interchange format that's easy for humans to read and write. It’s language-independent and widely used for data exchange between servers and web applications.

{
  "name": "John Doe",
  "age": 30,
  "isStudent": false,
  "courses": ["Math", "Science"],
  "address": {
    "street": "123 Main St",
    "city": "Boston"
  }
}

👉 For a complete overview, see our full Guide to JSON

FormatJSONOnline offers an all-in-one JSON toolkit that combines essential tools in a single interface: JSON Formatter to beautify your data, JSON Validator with AI-powered error fixing, JSON Minifier to compress for production, and a comprehensive editor with advanced features. Plus dozens of specialized converters and utilities.

Yes, all processing happens entirely in your browser using client-side JavaScript. Your JSON data never leaves your device or gets sent to our servers (except when using AI features, which are processed securely and not stored). This ensures complete privacy and security for your sensitive data.

No, all our tools are freely available without requiring any registration or account creation. You can use them immediately without any login or signup process. However, creating an account would allow you to save your work and access additional features.

To format JSON, simply paste your JSON data into our formatter tool, select your preferred indentation size (2-8 spaces or tabs), choose formatting options like quote style and key sorting, then click 'Format JSON'. The tool will automatically format your JSON with proper indentation, line breaks, and syntax highlighting.

JSON files can be opened in any text editor like Notepad, VS Code, or Sublime Text. For viewing and editing with our tools, you can either upload the file directly using the upload button, drag and drop it into the input area, or copy and paste its contents. You can also convert JSON files to Excel, CSV, or other formats using our conversion tools.

Yes! Our URL sharing feature allows you to generate shareable links for your JSON data. The data is compressed and encoded in the URL, so recipients can view your formatted JSON without you having to send files. You can also generate QR codes for easy mobile sharing.

Our AI-powered JSON validator can automatically detect and fix common JSON syntax errors like missing quotes, trailing commas, incorrect brackets, and more. When validation fails, simply click the 'Fix with AI' button and our intelligent system will attempt to correct the errors and provide a valid JSON output.

JSON often becomes invalid due to common syntax errors: missing keys quotes, trailing commas (not allowed in standard JSON), unclosed brackets or braces, or extra whitespace in wrong places. Our Validator identifies the exact line number of your error, and our AI Fixer can repair it instantly.

A JSON Formatter (or Beautifier) adds whitespace, indentation, and newlines to make JSON human-readable. A JSON Minifier (or Compressor) removes all unnecessary whitespace to make the file size as small as possible for faster network transmission.