Free Online JSON Diff Checker
JSON 1
JSON 2
Use this free JSON diff checker to compare two JSON objects and instantly identify differences. Whether you are comparing API responses, configuration files, or debugging data changes, this tool highlights added, removed, and modified properties with visual indicators.
No data leaves your browser: everything runs locally for maximum privacy. Compare JSON files side-by-side, upload documents directly, or paste JSON data to find differences in seconds.
How to Use This JSON Diff Checker
- 1Paste or upload your first JSON into the left input panel.
- 2Paste or upload your second JSON into the right input panel.
- 3Click "Compare JSON" to analyze differences between the two JSON objects.
- 4View the comparison results with color-coded highlights showing additions, removals, and modifications.
- 5Use "Clear All" to reset both inputs and start a new comparison.
Features
Side-by-Side Comparison
Compare two JSON objects side-by-side with synchronized scrolling to easily spot differences between complex structures.
Visual Highlighting
Color-coded differences highlight additions in green, removals in red, and modifications in yellow for quick identification.
File Upload Support
Upload JSON files directly from your computer to compare documents without manually copying and pasting content.
Nested Object Comparison
Deep comparison of nested objects and arrays to detect changes at any level of the JSON structure, no matter how complex.
Copy & Download
Copy comparison results to your clipboard or download them as JSON files for documentation and reporting.
Browser-Based
All processing happens in your browser. Your JSON data never leaves your device, ensuring complete privacy and security.
Detailed Difference Report
Get a comprehensive report showing exactly what changed, including property paths and before/after values for all modifications.
Syntax Validation
Automatic JSON validation ensures both inputs are valid JSON before comparison, with helpful error messages for invalid syntax.
What Is JSON Diff Checking?
JSON diff checking is essential for comparing API responses, configuration files, and data structures during development and testing. It helps identify changes between different versions of JSON data, making it easier to debug issues, verify updates, and understand data transformations.
A JSON diff tool compares two JSON objects property by property, highlighting additions (properties present in the second JSON but not in the first), removals (properties present in the first but not in the second), and modifications (properties that exist in both but have different values).
Developers working with APIs, configuration management, and data migration rely on JSON diff tools to verify changes, detect breaking updates, and ensure data consistency. Visual diff tools with side-by-side comparison streamline the debugging process and make it easy to spot discrepancies in complex nested structures.
JSON Diff Checker FAQs
Is this JSON diff checker safe to use?
Yes. The diff checker runs entirely in your browser. Your JSON data is never uploaded or stored on any server.
Does this tool save my data?
No. Once you refresh the page or close the tab, your input is cleared. For privacy, nothing is persisted or cached beyond your session.
How does the JSON diff checker work?
The tool compares two JSON objects and highlights differences including added, removed, and modified properties. It shows side-by-side comparison with color-coded indicators for easy identification.
Can I compare JSON files from different sources?
Yes. You can paste or upload two JSON files and compare them instantly. The tool identifies all differences between the two JSON structures, including nested objects and arrays.
What types of differences can this tool detect?
The tool detects added properties, removed properties, modified values, and structural changes in arrays and nested objects. It provides a detailed visual comparison with highlighting for each type of difference.