JSON array to indexed object

Client

Convert lists to map-like objects for APIs that forbid array roots but accept index keys.

Learn more: indexed objects

Keys are decimal index strings—sparse holes become explicit null entries if present.

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 wrap in array — Wrap any JSON value in a one-element array if it is not already an array—local helper. once JSON text parses on this page.
  • JSON unwrap single element — If the root is an array with exactly one item, output that item—otherwise report an error. once JSON text parses on this page.
  • JSON entries to object — Build an object from an array of [key, value] pairs—Object. 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

  • Convert lists to map-like objects for APIs that forbid array roots but accept index keys.

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.