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See It In Action
Experience the power of side-by-side JSON comparison
Why Choose JSON Differ?
Everything you need for professional JSON comparison
Privacy First
Client-side processing only. Your sensitive data stays in your browser and never touches our servers.
Powerful Editor
VS Code Monaco editor with syntax highlighting, validation, and support for massive files up to 10MB+.
Share & Collaborate
Generate shareable links for your diffs. Perfect for code reviews and team collaboration.
Trusted by Developers Worldwide
Join thousands of developers who trust JSON Differ for their daily workflow
"Saved me hours of debugging API responses. The side-by-side comparison with syntax highlighting is exactly what I needed. Privacy-first approach is a huge plus!"
"Perfect for comparing configuration files across environments. The ability to ignore certain keys is a game-changer. Use it daily for Kubernetes configs."
"Love that it's completely free with no hidden fees. The Monaco editor makes it feel like I'm working in VS Code. Handles large files without any lag!"
Used by developers at
Advanced Features
Powerful tools for every use case
Real-time Validation
Instant syntax error detection with line numbers
Smart Formatting
Auto-prettify minified JSON with one click
Ignore Options
Ignore key order, array order, or specific keys
Export & Download
Copy to clipboard or download as JSON files
What is JSON Differ?
JSON Differ is a powerful, free online tool for comparing JSON files and documents. Whether you're debugging API responses, comparing configuration files, or validating data structures, our tool provides instant, accurate JSON difference detection with an intuitive visual interface. Unlike other JSON comparison tools, we prioritize your privacy by processing everything client-side in your browser - your sensitive data never leaves your device.
Why Developers Choose JSON Differ
🔒 Complete Privacy Protection
All JSON processing happens directly in your browser using client-side JavaScript. Your API keys, credentials, and sensitive data remain 100% private. No server uploads, no data storage, no tracking. Perfect for comparing production configs and API responses without security concerns.
⚡ Professional-Grade Editor
Powered by Monaco Editor (the same engine as VS Code), our JSON diff tool supports syntax highlighting, auto-completion, error detection, and can handle massive JSON files up to 10MB+. Compare large API responses, configuration files, and data exports with ease.
🎯 Smart JSON Comparison
Advanced comparison options let you ignore key order, array order, or specific fields (like timestamps and IDs). Perfect for API testing, configuration management, and data validation. Get precise diff results with line-by-line highlighting of additions, deletions, and modifications.
🔄 Multi-Format Support
Convert between JSON, YAML, and XML formats instantly. Validate against JSON Schema (Draft 07). Format and beautify minified JSON. Export comparisons as HTML, Markdown, or plain text. All-in-one solution for data transformation and validation.
Common Use Cases
API Testing & Development
Compare API request and response payloads, validate endpoint outputs against expected results, debug REST API changes between versions, and ensure backward compatibility.
Configuration Management
Compare package.json files, analyze differences in tsconfig.json settings, validate Kubernetes YAML configurations, diff Docker Compose files, and track config changes across environments.
Data Validation & Migration
Verify data transformations, compare database exports, validate ETL pipeline outputs, ensure data integrity during migrations, and diff large JSON datasets.
Code Review & Collaboration
Share diff links with team members, review JSON structure changes, validate schema updates, document API changes, and collaborate on configuration updates.
How to Use JSON Differ
- Paste or Upload: Copy-paste your JSON content into the left (original) and right (modified) editors, or drag-and-drop JSON files directly into the interface.
- Configure Options: Click "Options" to customize comparison settings - ignore key order, array order, or specific fields like timestamps. Use presets for common scenarios (API comparison, config files, etc.).
- View Differences: Click "Show Diff" to see a side-by-side comparison with color-coded highlighting. Green indicates additions, red shows deletions, and yellow highlights modifications.
- Export & Share: Download results as JSON, export as HTML/Markdown for documentation, or generate a shareable link for team collaboration.
Frequently Asked Questions
Is JSON Differ really free?
Yes! JSON Differ is 100% free forever with no limits on file size, number of comparisons, or features. No credit card required, no account needed, no hidden costs.
Is my data secure?
Absolutely. With Privacy Mode enabled (default), all JSON processing happens client-side in your browser. Your data never leaves your device, never touches our servers, and is never stored or logged. Perfect for sensitive production data.
Can I compare large JSON files?
Yes! Our tool efficiently handles JSON files up to 10MB+. The Monaco Editor provides virtual scrolling and optimized rendering for large documents without performance degradation.
What formats are supported?
JSON Differ supports JSON, YAML, and XML formats. You can compare JSON to JSON, convert between formats (JSON↔YAML↔XML), validate against JSON Schema (Draft 07), and export results in multiple formats.
Can I ignore certain fields in comparison?
Yes! Use the Options panel to ignore specific keys (like timestamps, IDs, metadata), ignore key order, or ignore array order. We also provide presets for common scenarios like API comparison and config file diffs.
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