When is flattening JSON useful?
It is useful when you need spreadsheet-like fields, dot-path auditing, or quick mapping into form and config systems.
JSON Flatten / Unflatten
Convert nested JSON to flat key paths
JSON & Data
π 100% client-side β your data never leaves this pagePage mode
Input
Quick CTA
Paste JSON and flatten or unflatten it first for copy-ready output; array-index rules and scenarios stay in Deep.
Output
Converted JSON appears here
π 100% client-side
Next step workflow
Page reading mode
Quick keeps the summary, direct answers, and next steps so you can validate fit and get a result faster.
About this tool
Convert nested JSON objects into flat key-path structures and restore flat maps back into nested JSON. This tool helps when storing dynamic fields, building table exports, preparing search indexes, and debugging payload transformations. Supports customizable delimiters and handles array indexes in key paths. All processing is done in your browser with no server upload.
Direct Answers
Can flattening lose structure meaning?
Yes. Nested intent becomes path-based text, so you should preserve the original structure when reversibility matters.