A Complete Toolkit for JSON and Text Processing
Format JSON Online is a free, all-in-one JSON tool to format, validate, minify, and compare JSON. Convert JSON to CSV, XML, Dart, or JavaScript — all in your browser, no login needed.
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Input JSON
Output
Formatting Options
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Why Choose FormatJSONOnline?
Our tools are designed with developer productivity and user experience in mind.
All in One Toolkit
Everything you need to work with JSON in one place - no need to switch between multiple tools.
Privacy First
All processing happens in your browser. Your JSON data never leaves your device.
No Installation Required
Use our tools instantly in your browser without downloading or installing any software.
Key Features of FormatJSONOnline
- Free JSON Formatter & Beautifier:
Instantly format messy or minified JSON into a readable structure—perfect for improving code clarity. - JSON Validator:
Detect syntax errors in real time while pasting or writing JSON; great for quick validation. - Side-by-Side JSON Comparison:
Compare two JSON files visually with color-coded differences:
🔴 Deletions, 🟢 Additions, 🟡 Modifications. - Simultaneous Scrolling:
Both JSON panes scroll together, making it easier to track differences line-by-line. - Screenshot Generator:
Capture and download high-quality screenshots of your JSON comparisons—ideal for sharing or documentation. - In-Browser, No Setup Required:
No login, no extension, no app—just open the site and get started instantly. - Optimized for Large Files:
Designed to handle large JSON data (~30MB+) without lag or crashing. - Secure and Private:
Your data stays on your device. Nothing is uploaded to any server—fully privacy-conscious. - Developer-Focused Use Cases:
✔️ Debugging REST API responses
✔️ Comparing staging vs. production outputs
✔️ Validating 3rd party JSON feeds
✔️ Teaching or documenting JSON examples - Mobile-Friendly UI:
Responsive design that works across desktop, tablet, and mobile screens.
Ready to Get Started?
Choose from our suite of JSON tools to start processing your data right away.
JSON Formatter
Format and beautify your JSON data with customizable indentation.
JSON Validator
Verify your JSON syntax and identify errors in your code.
JSON Compare
Compare two JSON files and identify the differences between them.
JSON Minifier
Remove whitespace and reduce the size of your JSON files.
JSON to XML
Convert your JSON data to XML format for different applications.
JSON to CSV
Transform your JSON arrays into CSV format for spreadsheet applications.
Frequently Asked Questions
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. Example: { "name": "John Doe", "age": 30, "isStudent": false, "courses": ["Math", "Science"], "address": { "street": "123 Main St", "city": "Boston" } }
What tools does FormatJSONOnline offer?
FormatJSONOnline offers a comprehensive suite of JSON tools including JSON Formatter, JSON Validator, JSON Compare, JSON Minifier, JSON to XML Converter, JSON to CSV Converter, and Dummy JSON generator for testing purposes.
Is my data secure when using these tools?
Yes, all processing happens entirely in your browser. Your JSON data never leaves your device or gets sent to our servers. This ensures complete privacy and security for your data.
Do I need to create an account to use these tools?
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.
How do I format JSON?
To format JSON, paste your JSON data into our formatter tool, select your preferred indentation size, and click 'Format JSON'. The tool will automatically format your JSON with proper indentation and line breaks to make it more readable.
How do I open a JSON file?
JSON files can be opened in any text editor like Notepad, VS Code, or Sublime Text. For viewing and editing, use our JSON formatter tool by uploading the file or copying its contents. You can also open JSON files in browsers, or convert them to Excel format using our JSON to Excel converter.