JSON Transformer
Transform 1-to-1 or split 1-to-2 JSON arrays with field control
Operation Mode
Transform one JSON file to another with field selection and renaming.
JSON Input
Drag & drop or click to select one or more JSON files.
About JSON Transformer
What is JSON Transformer?
JSON Transformer is a powerful tool for refactoring and reorganizing JSON data. It allows you to transform a JSON array with field selection, renaming, and removal in two modes:
- Transform (1-to-1): Transform one JSON file to another with selected fields
- Split (1-to-2): Split a JSON array into two separate files with custom field distribution
Perfect for data migration, API response transformation, and database preparation.
Key Features
- • Transform JSON arrays (1-to-1 file conversion)
- • Split JSON into two customized files (1-to-2)
- • Remove or rename fields during transformation
- • Bulk process multiple JSON files at once
- • Download results as individual files or ZIP archive
- • Handle missing fields with null value option
How to Use JSON Transformer
1 Choose Operation Mode
Select between Transform (1-to-1) or Split (1-to-2) mode depending on your needs.
2 Upload or Paste JSON
Choose between two input methods:
- Upload Files: Drag & drop or click to select one or more JSON files
- Paste JSON: Copy and paste a JSON array directly into the textarea
3 Configure Field Mapping
After loading your JSON, select and configure fields:
- For Transform: Select which fields to keep in the output file
- For Split: Distribute fields between the two output files
- Rename fields: Optionally rename any field (e.g., "email" → "user_email")
4 Configure Advanced Options (Optional)
Fine-tune your output with these options:
- Keep missing fields as null: Include missing fields with null values for consistent structure
- Pretty-print output: Format JSON with proper indentation for readability
5 Transform/Split and Download
Click the Transform or Split button to generate your output. Then choose your download option:
- Download: Get your transformed or split files
- Copy to Clipboard: Copy individual files for quick pasting
- For bulk uploads: Each input file generates its own output in the ZIP
Use Cases & Examples
User Data Export (Transform)
Transform user records to keep only public fields (id, name) while removing sensitive data.
User Data Export (Split)
Split user records into public data (id, name) and private data (id, email) for different systems.
Database Preparation
Transform or split data for import into database tables with specific required fields.
API Response Optimization
Transform API responses with field renaming for different client requirements.
Bulk Data Processing
Process dozens of similarly-structured JSON files simultaneously with automatic validation.
Data Cleanup
Remove unnecessary fields from JSON data to reduce file size and improve performance.
Important Notes
- • Input validation: Your JSON must be a valid array of objects
- • Bulk upload structure: All uploaded files must have identical field names to proceed
- • Transform mode: Removes fields not selected, keeping only specified fields
- • Object order: The order of objects in your array is always preserved
- • Privacy: All processing happens in your browser - no data is sent to servers
- • File naming: Bulk uploads preserve original filenames with appropriate suffixes