JSON flatten arrays (one level)
ClientOne-level flatten for batch results—deeper nesting stays nested; pair with concat for array-of-arrays.
Learn more: flattening one level
Non-array elements are kept in order—only direct child arrays are expanded one level.
Local processing
Parsing and output formatting run entirely in your browser—nothing is uploaded for this transform.
Input
?
Nearby workflows on Toolcore
- JSON concat arrays — Flatten one level: concatenate arrays from a JSON array-of-arrays—client-side. once JSON text parses on this page.
- JSON flatten / unflatten — Nested JSON ↔ dot paths for configs and i18n—round-trip in the browser. once JSON text parses on this page.
- JSON array chunks — Split a JSON array into fixed-size batches or merge nested arrays into one list—pagination and bulk helpers, client-side. once JSON text parses on this page.
- NDJSON / JSON Lines — Newline-delimited JSON: lines to array, array to lines, validate, minify—client-side. once JSON text parses on this page.
Common use cases
- One-level flatten for batch results—deeper nesting stays nested; pair with concat for array-of-arrays.
Common mistakes to avoid
Invalid JSON
Fix parse errors before expecting output.
FAQ
Is data uploaded?
No—all parsing and transforms run locally.
How is this different from jq?
This page focuses on one deterministic task without a filter language.
More tools
Related utilities you can open in another tab—mostly client-side.
JSON concat arrays
ClientFlatten one level: concatenate arrays from a JSON array-of-arrays—client-side.
JSON flatten / unflatten
ClientNested JSON ↔ dot paths for configs and i18n—round-trip in the browser.
JSON array chunks
ClientSplit a JSON array into fixed-size batches or merge nested arrays into one list—pagination and bulk helpers, client-side.
NDJSON / JSON Lines
ClientNewline-delimited JSON: lines to array, array to lines, validate, minify—client-side.