How to Flatten Nested JSON Into Rows
Published September 18, 2026 · 2 min read
Nested JSON doesn't map cleanly onto a spreadsheet's rows and columns. Flattening converts every nested value into a single dot-notation key — like user.address.city — paired with its value, which is much easier to scan, filter, or import into a flat table.
Try JSON FlattenerSteps
- 1
Open the JSON Flattener tool
Go to the JSON flattener.
- 2
Paste your JSON
Provide the nested data you want flattened.
- 3
Flatten
Every value, however deeply nested, becomes one dot-notation key/value row.
- 4
Download the result
Get a CSV of key/value pairs, ready to open in a spreadsheet.
Frequently asked questions
Array items get a bracketed index in their key, like tags[0] and tags[1], so each element still has its own distinct, addressable key.
It's represented clearly as an empty structure in the output, rather than silently disappearing from the result.
Flattened key/value rows are much easier to scan, sort, search or import into a spreadsheet than deeply nested JSON, especially for BI or data-prep workflows.
Because flattening runs locally, turning a complex nested API response into a scannable table never means uploading that data anywhere.