JSON Flatten
Flatten nested JSON into a single-level object with dot-notation keys (a.b.c). Useful for CSV / spreadsheet export, search-index normalization, and env-var generation.
About JSON Flatten
JSON Flatten collapses a nested JSON object into a single level, turning paths like a.b.c into flat dot-notation keys. It is the bridge you need when nested data has to become tabular — for CSV export, search-index fields, or environment variables. It runs in your browser, so even sensitive config payloads stay on your device.
- Category
- convert
- Input
- Accepts: application/json or text/plain.
- Output
- Outputs: application/json.
- Cost
- Free, runs in your browser
- Memory
- low
Common uses
- Flatten a nested API response so it maps cleanly onto spreadsheet columns
- Turn a deep config object into flat KEY=value pairs for environment variables
- Normalize nested documents into flat fields before pushing to a search index
- Compare two JSON objects more easily once both are flattened to dot-notation keys
- Prepare nested JSON for a CSV exporter that only understands single-level rows
- Inspect a deeply nested payload as a readable flat list of leaf values
Frequently asked questions
What does the output look like?
A single-level JSON object whose keys are dot-notation paths (a.b.c) pointing to the original leaf values.
How are arrays handled?
Array elements become indexed keys in the flattened path, so nested list values still get a unique key.
Does my JSON get uploaded?
No. Flattening runs entirely in your browser tab.
Can I rebuild the original structure later?
Yes. JSON Unflatten is the exact inverse and round-trips with this tool.
What input does it accept?
Valid JSON as application/json or plain text; the result is a flat JSON object.
Keywords
- json
- flatten
- flat
- dot-notation
- normalize
- nested
- object