JSON collapse field values

Client

Inverse of explode-array-field—merge rows sharing the same field value.

Learn more: collapsing fields

Groups by JSON.stringify equality on the chosen field; other columns come from first row.

Local processing

Parsing and output formatting run entirely in your browser—nothing is uploaded for this transform.

Input

?
Paste JSON, then read transformed output below.

Nearby workflows on Toolcore

  • JSON explode array field — Expand an array field on each object row into multiple rows—local flatten. once JSON text parses on this page.
  • JSON group by field — Bucket a root array of objects by one property—object of arrays output; local only. once JSON text parses on this page.
  • JSON unique by field — Deduplicate JSON array rows by one field—keep first or last; local only. once JSON text parses on this page.
  • JSON formatter — JSON format online: pretty-print, minify, validate, escape, download . once JSON text parses on this page.

Common use cases

  • Inverse of explode-array-field—merge rows sharing the same field value.

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.