Upload multiple JSON files and convert them all at once. Download results as a ZIP.
Drag & drop or browse for multiple .json files
Select output: CSV, XML, YAML, TypeScript, or Formatted JSON
Process all files and download as a ZIP archive
100% Private: All files are processed entirely in your browser. Nothing is uploaded to any server.
Supported formats: Convert JSON files to Formatted JSON, Minified JSON, CSV (arrays only), YAML, XML, or TypeScript interfaces.
ZIP download: All converted files are packaged into a single .zip file for easy download.
Limits: Each file can be up to 10MB. No limit on number of files (browser memory permitting).
Have questions? Check our FAQ page.
When working with multiple JSON files - whether from API exports, database dumps, or configuration sets - converting them one by one is tedious and time-consuming. Bulk conversion lets you process dozens or hundreds of files in a single operation, saving significant time.
After processing, all converted files are packaged into a single ZIP archive for convenient download. Each file retains its original name with the appropriate new extension (e.g., data.json becomes data.csv). The ZIP is generated entirely in your browser using JSZip - no server involved.
When migrating data between systems, you often receive multiple JSON files from an API export or database dump. Use bulk convert to transform all files to CSV for spreadsheet analysis or to XML for legacy system imports - without manual file-by-file processing.
DevOps teams frequently manage dozens of configuration files across environments. Bulk convert lets you transform all JSON configs to YAML for Kubernetes deployments, or standardize formatting across all files with consistent 2-space indentation.
When testing APIs, you might save multiple response samples. Bulk convert helps you transform all responses to TypeScript interfaces for type-safe frontend development, or to CSV for data analysis in Excel or Google Sheets.
Reduce storage and bandwidth costs by bulk-minifying all JSON files in your project. The minified output removes all whitespace, reducing file sizes by 10-30% depending on the original formatting.
There's no hard limit on the number of files. The practical limit depends on your browser's memory. Most modern browsers can handle 50-100 files of average size (under 1MB each) without issues. For very large batches, consider processing in groups of 25-50 files.
Each individual file can be up to 10MB. Files larger than this may cause browser performance issues. For very large JSON files, consider using command-line tools like jq or splitting the data into smaller chunks.
Yes, completely. All processing happens in your browser using JavaScript. Your files are never uploaded to any server - they stay on your local machine. This makes the tool safe for sensitive data like API credentials, configuration files, and proprietary business data.
CSV conversion requires JSON arrays (lists of objects with consistent keys). If your JSON is a single object or has deeply nested structures, it can't be directly converted to a flat CSV table. For nested JSON, consider using our Tree Viewer to explore the structure first.
Currently, all files in a batch are converted to the same output format. If you need different formats for different files, run multiple batch operations or use our individual converter tools for one-off conversions.
Invalid files are skipped and flagged in the results. The tool continues processing all valid files, so one bad file won't stop the entire batch. You'll see a summary showing which files succeeded and which failed.
This tool processes all files 100% client-side in your browser. Your JSON data never leaves your machine - no uploads, no server processing, no logging. The ZIP file is generated locally using JSZip, a trusted open-source library. This makes Bulk Convert safe for sensitive configuration files, API responses with credentials, and proprietary business data.