JSON Split
Break large JSON files into smaller, manageable chunks. Split by item count, file size, field value, or key path. Preview results before splitting and download as ZIP.
JSON Input
Split Options
Variables: {prefix}, {index}, {total}, {group}
No split results yet
Add valid JSON and click "Split JSON" to break it into smaller files
Split Modes Explained
By Item Count
Splits arrays into chunks with a fixed number of items. Perfect for batch processing or pagination-like scenarios.
By File Size
Splits based on output file size (KB or MB). Ideal for APIs with upload limits or systems with memory constraints.
By Field Value
Groups items by a specific field (e.g., status, country, type). Creates one file per unique value. Great for organizing data.
By Top-Level Keys
Creates one file per top-level key. Useful for splitting config files or multi-section data.
How to Use
- 1Paste your JSON or drag & drop a file. The tool auto-detects arrays and groupable fields.
- 2Choose a split mode: item count, file size (KB/MB), field value (group by), or top-level keys.
- 3Use preset buttons or enter custom values. Select array path and customize filename template.
- 4Review the preview panel showing estimated files, sizes, and groups before splitting.
- 5Press Ctrl+Enter or click "Split JSON". Download as ZIP or individual files.
Use Cases
- API Limits: Break 20MB files into 4MB chunks
- Batch Processing: Split 50K records into 1K chunks
- Database Import: Create manageable import batches
- Data Organization: Group by country, status, type
Split by Field Value
- Auto-detects fields with 2-50 unique values
- Creates one file per unique value
- Files named by group (e.g., admin.json, user.json)
- Perfect for categorizing exports
Filename Templates
{prefix}-{index}.json{prefix}-{index}-of-{total}.json{group}.json(for field splits)
Frequently Asked Questions
What is JSON splitting?
JSON splitting is the process of breaking a large JSON file into smaller, more manageable chunks. This is useful when dealing with large datasets that need to be processed in batches, uploaded to APIs with size limits, or imported into databases incrementally.
How can I split a JSON file by number of items?
Use the "By Item Count" mode and specify how many items you want per file. For example, setting 100 items per file will split an array of 1000 items into 10 separate files. Use preset buttons (10, 50, 100, 500, 1000, 5000) for quick selection.
Can I split JSON files by file size in KB or MB?
Yes! Use the "By File Size" mode and toggle between KB and MB units. Set your maximum file size and the tool will intelligently distribute items to keep each file under your limit. Perfect for APIs with upload restrictions (e.g., 4MB or 10MB limits).
How do I group/split JSON by a field value?
Use the "By Field Value" mode to group items by any field (e.g., status, country, type). The tool auto-detects groupable fields with 2-50 unique values. Each unique value becomes its own file. Great for organizing data by category.
What is the preview feature?
Before splitting, the tool shows a preview with estimated number of files, average items per file, and average file size. For "By Field Value" mode, it also shows the group values. This helps you verify settings before processing.
Can I customize the output filenames?
Yes! Choose from filename templates like "split-001.json", "split-001-of-010.json", or use {group} for field-value splits. Variables include {prefix}, {index}, {total}, and {group}.
How do I download all split files at once?
Click "Download ZIP" to download all split files as a compressed archive. You can also use "Download Files" to download the first 10 files individually, or expand each result to download specific files.
Is my data secure when using this tool?
Absolutely. All processing happens entirely in your browser using JavaScript. Your JSON data is never sent to any server, stored, or logged. This tool is completely privacy-first and works offline.
What keyboard shortcuts are available?
Press Ctrl+Enter (or Cmd+Enter on Mac) to quickly split your JSON without clicking the button. The tool also auto-detects array paths and groupable fields as you paste JSON.
Can I split nested arrays inside a JSON object?
Yes! The tool auto-detects all array paths in your JSON (e.g., "users[]", "data.items[]"). Select the path from the dropdown or type it manually. Enable "Preserve parent object structure" to keep the wrapper in each split.
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