JSON merge arrays unique

Client

Set-style union on JSON arrays using JSON.stringify equality.

Learn more: unique merge

Preserves first-seen order from left then right.

Local processing

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

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Nearby workflows on Toolcore

  • JSON intersect arrays — Keep items appearing in both left and right arrays—browser-only. once JSON text parses on this page.
  • JSON diff arrays — Items in left not present in right array—{left, right} input, local. once JSON text parses on this page.
  • JSON concat arrays — Flatten one level: concatenate arrays from a JSON array-of-arrays—client-side. 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

  • Set-style union on JSON arrays using JSON.stringify equality.
  • Paste valid JSON, then read the transformed output below.

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.