JSON Merger
Merge multiple JSON files into one with flexible strategies
Upload JSON Files
Drag & drop or click to select two or more JSON files.
About JSON Merger
What is JSON Merger?
JSON Merger is a powerful tool for combining multiple JSON files into one. It supports three flexible merging strategies to handle different use cases:
- Concatenate: Combine all arrays end-to-end
- Deduplicate: Remove duplicate objects automatically
- Merge by Key: Merge objects with matching keys intelligently
Perfect for data consolidation, API response aggregation, and database preparation.
Key Features
- • Merge multiple JSON files into one seamlessly
- • Three merge strategies: concatenate, deduplicate, and merge-by-key
- • Intelligent key-based merging for complex data structures
- • Automatic deduplication of identical objects
- • Bulk process multiple JSON files at once
- • Pretty-print and minify output options
How to Use JSON Merger
1 Upload JSON Files
Upload two or more JSON files using drag & drop or file browser. Each file should contain a JSON array.
2 Choose Merge Strategy
Select how you want to merge your files:
- Concatenate: Simply combine all arrays
- Deduplicate: Remove duplicate objects
- Merge by Key: Merge objects with matching key values
3 Configure Options (Optional)
For merge-by-key strategy, specify the field name to use as the merge key.
Choose to pretty-print or minify the output JSON.
4 Merge and Download
Click the "Merge JSON" button to combine your files, preview the result, and download.
Use Cases & Examples
API Response Aggregation
Combine paginated API responses into a single dataset for easier processing.
Data Consolidation
Merge data from multiple sources into one unified JSON file for analysis.
Database Imports
Combine multiple JSON files for batch import into databases or data warehouses.
Log Consolidation
Merge log files from different sources into a single file for analysis.
Record Deduplication
Remove duplicate records when merging data from overlapping sources.
Configuration Merging
Combine configuration files from different environments using key-based merging.
Important Notes
- • File Format: All uploaded files must contain JSON arrays of objects
- • Minimum Files: At least two JSON files are required to merge
- • Merge Key: When using merge-by-key strategy, specify the field name that uniquely identifies records
- • Deduplication: Exact object comparison is used to detect duplicates
- • Privacy: All processing happens in your browser - no data is sent to servers
- • Order Preservation: The order of objects and files is preserved in the output