JSON add row index

Client

Stable row numbers before CSV export or diffing ordered lists.

Learn more: row indexes

Non-objects become single-key objects with only the index field.

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 array to indexed object — Map array indices to string keys—0, 1, 2… as object properties, client-side. once JSON text parses on this page.
  • JSON pluck field — From a JSON array of objects, output an array of one field's values—browser-only. once JSON text parses on this page.
  • CSV ↔ JSON — Paste a table or JSON array of objects—convert both ways, choose delimiter, 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

  • Stable row numbers before CSV export or diffing ordered lists.

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.