Free Online JSON Compare & Diff Tool
Compare two JSON files instantly with our powerful diff tool. Visualize differences in tree or code view with color-coded highlighting for added, removed, modified, and moved elements. Features smart array comparison, key order normalization, deep nested object analysis, and one-click patch generation. Export diffs as JSON Patch (RFC 6902) or merge conflicts directly. Perfect for API testing, config validation, and debugging. 100% browser-based—your sensitive data never leaves your device.
Loading...
Your adventure is about to begin
Powerful JSON Comparison Features
Everything you need to compare, validate, and analyze JSON data
Side-by-Side Comparison
Visual diff view with highlighted changes, additions, and deletions
Real-time Validation
Instant JSON syntax validation with error highlighting
Secure & Private
All processing happens in your browser - no data sent to servers
Smart Formatting
Auto-format and beautify JSON with customizable indentation
Advanced Search
Find and navigate through differences quickly
Export Results
Download comparison reports in multiple formats
Real-World Use Cases
How developers and teams use our JSON compare tool
API Development
Compare API responses between different environments or versions. Perfect for debugging REST APIs and webhooks.
Version Control
Track changes in configuration files and data structures across different versions of your application.
Data Migration
Verify data integrity during database migrations by comparing exported JSON data.
Cloud Configuration
Compare infrastructure-as-code templates, Kubernetes manifests, and cloud service configurations.
How to Compare JSON Files
Simple 3-step process to compare your JSON data
Paste or Upload JSON
Input your JSON data by pasting, typing, or uploading files
Configure Options
Set comparison rules like ignore array order or case sensitivity
View & Export Results
See highlighted differences and download comparison reports
Advanced Comparison Options
Customize how JSON documents are compared with these intelligent options
Technical Capabilities
Built with modern web technologies for optimal performance
Code Editor
VS Code's editor engine for professional IDE experience
Deep Diff Algorithm
Recursive comparison of nested objects and arrays
Client-Side Processing
No server uploads - your data stays private
About JSON Comparison
JSON (JavaScript Object Notation) comparison is essential for modern web development, API testing, and data validation. Our online JSON compare tool makes it easy to identify differences between two JSON documents, whether you're debugging API responses, reviewing configuration changes, or validating data migrations.
Why Use a JSON Diff Tool?
Manual comparison of JSON files is error-prone and time-consuming, especially with nested structures and large datasets. A dedicated JSON diff tool automates this process, highlighting exact differences, validating syntax, and providing clear visual feedback about what has changed between versions.
JSON Compare vs Text Compare
Unlike simple text comparison tools, JSON compare understands the structure and semantics of JSON data. It can ignore formatting differences, handle array reordering, and provide meaningful comparison of nested objects. This semantic understanding makes it invaluable for developers working with APIs, configuration files, and data structures.
Best Practices for JSON Comparison
- Always validate JSON syntax before comparison to avoid parsing errors
- Use appropriate comparison options based on your data structure
- Consider array order significance in your specific use case
- Format both JSON documents consistently for clearer visual comparison
- Export diff reports for documentation and code review purposes
Frequently Asked Questions
What is JSON Compare and how does it work?
JSON Compare is an online tool that analyzes and highlights differences between two JSON documents. It parses both JSON structures, performs a deep comparison of all nested objects and arrays, and displays the differences in an easy-to-understand visual format. The tool works entirely in your browser using advanced diff algorithms.
Can I compare large JSON files?
Yes! Our JSON compare tool uses Monaco Editor (the same engine that powers VS Code) which efficiently handles large JSON files up to several megabytes. The tool uses virtual scrolling and lazy loading to ensure smooth performance even with complex nested structures.
What types of differences does the tool detect?
The tool detects all types of changes including: added properties, removed properties, modified values, type changes, array modifications, nested object changes, and structural differences. It also supports various comparison modes like ignoring array order, case sensitivity, and whitespace.
Is my JSON data secure when using this tool?
Absolutely! All JSON processing happens locally in your browser. No data is sent to our servers or stored anywhere. Your sensitive data, API keys, and confidential information remain completely private and secure on your device.
Can I compare JSON with different formatting?
Yes! The tool automatically handles different formatting styles. Whether your JSON is minified, prettified, or has different indentation, the comparison focuses on the actual data structure and values, not the formatting.
How do I interpret the comparison results?
The tool uses color coding: green for additions, red for deletions, and yellow/amber for modifications. In side-by-side view, you can see both versions with changes highlighted. The inline view shows a unified diff with change indicators.
Can I export or share the comparison results?
Yes, you can copy the diff report to clipboard or download it as a text file. The report includes detailed statistics, all changes with their paths, and comparison settings used.
Does the tool support JSON Schema validation?
While the primary focus is comparison, the tool includes built-in JSON syntax validation. It will highlight syntax errors, trailing commas, and other JSON format issues in real-time.
Ready to Get Started?
Choose from our suite of JSON tools to start processing your data right away.