Is my JSON data uploaded to a server?
No. The tool parses, transforms, previews, and exports data locally in your browser without uploading your input.
Data & Tables
JSON Flattener
Flatten nested JSON online. Convert nested objects into path-based keys locally in your browser without uploading data.
Tool
JSON Flattener
Flatten nested JSON online. Convert nested objects into path-based keys locally in your browser without uploading data.
This tool runs in your browser. Your input is processed locally and is not uploaded.
About this Tool
Use this JSON Flattener to turn nested objects into a flatter structure with path-based keys. The tool can choose dot notation or bracket notation, flatten arrays with documented limits, and preview how nested fields map to output keys. It is useful before converting JSON to CSV, Markdown, or spreadsheet-style formats that expect columns.
Examples
- [ { "orderId": "A-1001", "customer": { "name": "Ada", "country": "DE" }, "items": [{ "sku": "N-01", "qty": 2 }], "total": 39.9 }, { "orderId": "A-1002", "customer": { "name": "Ben", "country": "US" }, "items": [{ "sku": "P-04", "qty": 5 }], "total": 24.5 } ]
Frequently Asked Questions
How are nested JSON values handled?
Objects can be flattened with configurable path notation. Arrays work best when they contain row-like objects; deeply mixed arrays may need manual review before conversion.
Which path notation is supported?
The tool supports clear path notation such as dot paths and optionally bracket paths for keys that contain dots or special characters.
Can arrays be flattened?
Simple arrays can be indexed or summarized depending on options. Mixed arrays of different shapes may need manual review.
Can flattening be reversed?
It can be reversed when the path notation is unambiguous and keys do not collide. The JSON Unflattener handles that separate workflow.
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