Heroka web tool

Quick JSON

Build valid JSON from a tree — live preview, copy, download, saved library when signed in.

                { object }

                  name: "Product"

                  tags: [ array ]

                    0: "featured"

                  meta: { object }

                    version: 2

Live JSON

{
  "name": "Product",
  "tags": ["featured"],
  "meta": { "version": 2 }
}

Copy JSON Download

A visual JSON builder: edit nodes in a tree, watch the document stay valid, then copy or download. Sign in to save documents to your personal library and pick them up later across sessions.

Key features

Tree editor with add, remove, and reorder patterns for objects and arrays
Live JSON preview and copy-to-clipboard
Download and a saved library when you sign in

Quick start

Build a tree—add objects, arrays, keys, and values from the editor
Watch the live JSON panel update and fix any invalid nodes before copying
Use Copy or Download, or sign in and Save to your library

Who it’s for

API integrators sketching payloads before Postman collections exist

Technical writers and support engineers who need reproducible JSON examples