Merge Multiple JSON Files into One
Withdata DataFileConverter is a lightweight, local desktop tool for merging multiple JSON files quickly and safely. No upload required, supports GUI and command line, works on Windows, Mac, and Linux.
Download DataFileConverterKey Features
- Merge multiple JSON files into a single JSON file
- 100% local processing, no data sent to cloud
- Cross-platform: Windows, macOS, Linux
- Both GUI wizard and command line (CLI) mode
- Batch merge entire folders of JSON files
- Support recursive folder scanning
- Custom output format: array with name, array without name
- Configurable encoding (UTF-8 default)
- Save sessions and automate via scripts
- High speed even for large JSON files with millions of rows
How to Merge JSON Files (GUI Steps)
- Launch DataFileConverter, start a new conversion, and set source/target type to JSON 📷
- Add JSON files or select a folder to batch import 📷
- Set output path, JSON output structure and column mapping 📷
- Click convert to merge and preview the result 📷
Command Line Automation
You can merge JSON files via CLI for automation and scheduled tasks:
- Configure your merge in GUI and save the session
- Generate .bat (Windows) or .sh (Mac/Linux) script 📷
- Run in command prompt or terminal
- Schedule with Windows Task Scheduler or crontab
Frequently Asked Questions
A: It processes millions of rows within minutes, optimized for speed and low memory usage.
A: Yes. All operations run locally on your computer. No files are uploaded to any server.
A: Yes. Native versions are available for Windows, macOS, and Linux.
A: Yes. The tool supports CLI mode for automation, scripting, and scheduled tasks.
A: Yes. You can select an entire folder and batch merge all JSON files recursively.
A: Yes. You can choose array with name, array without name, and customize date formats and encoding.
Start Merging JSON Files Today
Download free trial and merge JSON files easily on Windows, Mac, or Linux.
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