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. Now with AI-powered error fixing and URL sharing capabilities.
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Comprehensive JSON Features
Everything you need to work with JSON data, from basic formatting to advanced AI-powered features.
Core Features
Sharing & Export
AI & Automation
Advanced Features & Capabilities
Powerful features designed for modern developers and teams.
URL Sharing & Collaboration
Generate shareable links for your JSON data with compression and encoding for easy collaboration.
AI-Powered Tools
Leverage artificial intelligence for JSON validation, error fixing, and intelligent suggestions.
Performance Optimized
Lightning-fast processing with Web Workers, client-side processing, and optimized algorithms.
Privacy & Security
Your data stays secure with client-side processing, no server storage, and encrypted sharing.
Mobile Responsive
Fully responsive design that works perfectly on desktop, tablet, and mobile devices.
Customizable Interface
Personalize your experience with dark/light themes, custom formatting, and layout options.
The Ultimate JSON Toolkit, Reimagined.
From AI-powered generation to instant validation and diffing, FormatJSONOnline has every tool you need to work with JSON faster and smarter.
AI JSON Generator
Transform plain text into valid JSON with AI. Describe your data and let our tool build the structure for you.
Effortless JSON Formatter
Instantly beautify messy or minified JSON into a clean, human-readable format. Perfect for debugging.
Visual Diff Checker
Compare two JSON files side-by-side with clear, color-coded highlights for additions, deletions, and changes.
Instant Mock API
Generate a live API endpoint from your JSON data. Ideal for rapid prototyping without any backend setup.
Seamless Chrome Extension
Access all our powerful JSON tools directly from your browser toolbar for maximum productivity on any website.
Interactive JSON Data Visualization Tool
Advanced JSON visualizer with multiple view modes: interactive graphs, tree views, tables, and more.
Translate JSON
Translate JSON data from one language to another with our free online JSON translator. Perfect for i18n, API localization, and multilingual apps.
Download JSON Files by Size (Bytes, KB, MB)
Generate and download JSON files with exact sizes (Bytes, KB, MB). Perfect for testing API limits, uploads, and performance.
Free Online SQL Formatter & Beautifier
Free online SQL formatter for MySQL, PostgreSQL, SQLite & more. Beautify, validate & fix SQL instantly to improve readability and catch errors fast.
Popular JSON Tools
Our most-used tools for JSON processing, validation, and conversion.
JSON Formatter & Beautifier
Format and beautify JSON with syntax highlighting, tree view, customizable indentation, and advanced formatting options.
JSON Validator with AI Fix
Validate JSON syntax with detailed error reporting and AI-powered automatic error fixing capabilities.
JSON Compare & Diff
Compare two JSON files with visual diff highlighting, side-by-side view, and detailed change analysis.
JSON Minifier & Compressor
Minimize JSON size by removing whitespace, comments, and unnecessary characters for production use.
JSON to XML Converter
Convert JSON data to XML format with customizable formatting, attribute handling, and namespace support.
JSON to Excel Converter
Transform JSON into Excel spreadsheets with automatic column detection, nested object flattening, and formatting.
Why Choose FormatJSONOnline?
Our tools are designed with developer productivity, security, 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.
How to Use Our JSON Tools
Get started with our JSON tools in just a few simple steps.
1. Input JSON
Paste, upload, or drag & drop your JSON data
2. Choose Options
Select formatting, validation, or conversion options
3. Process
Let our tools format, validate, or convert your JSON
4. Share & Export
Download, copy, or share your results with others
Latest JSON Tutorials & Tips
Learn JSON best practices, advanced techniques, and stay updated with the latest developments.
Translate JSON Instantly Online – Keys, Values & i18n Best Practices | FormatJSONOnline
A comprehensive guide to using the formatjsononline.com JSON Translator to translate the values in your JSON files while preserving the structure.
Create a Free Mock API in Under 60 Seconds – Step-by-Step Guide | FormatJSONOnline
Stop waiting for a backend. Learn the fastest way to create a live, shareable mock REST API from scratch for free, using nothing but a text prompt and AI.
How to Parse and Manipulate JSON in JavaScript
Learn how to parse and stringify JSON in JavaScript using `JSON.parse()` and `JSON.stringify()` with real-world examples and error handling techniques.
Frequently Asked Questions
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data interchange format that's easy for humans to read and write. It's based on a subset of JavaScript but is language-independent and widely used for data exchange between servers and web applications. <br /> <strong>Example:</strong> <pre><code> { "name": "John Doe", "age": 30, "isStudent": false, "courses": ["Math", "Science"], "address": { "street": "123 Main St", "city": "Boston" } } </code></pre>- For a complete overview, see our fullGuide to JSON
What tools does FormatJSONOnline offer?
FormatJSONOnline offers a comprehensive suite of JSON tools including JSON Formatter, JSON Validator with AI-powered error fixing, JSON Compare with visual diff, JSON Minifier, JSON to XML/CSV/Excel Converter, Dummy JSON generator, URL sharing capabilities, and many more advanced features for developers.
Is my data secure when using these tools?
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.
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. However, creating an account would allow you to save your work and access additional features.
How do I format JSON?
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.
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 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.
Can I share my JSON data with others?
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.
What is the AI-powered JSON fixing feature?
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.