JSON Builder

Build nested JSON visually — and keep code perfectly in sync.

Left: drag, reorder, and collapse sections. Right: paste JSON, auto-format, and get clean syntax highlighting.

Visual structure

Drag the handle to reorder. Expand objects/arrays to edit nested fields.

object

{ … }

string

array

[ … ]

string

Drag items here to reorder within this container.

boolean

Drag items here to reorder within this container.

object

{ … }

string

number

Drag items here to reorder within this container.

Root

Add top-level fields and drag to reorder. Expand containers to edit nested data.

JSON

Paste/modify JSON here. Valid JSON instantly updates the left side.

Valid

{
  "profile": {
    "name": "Avery",
    "title": "Systems Designer",
    "skills": [
      "TypeScript",
      "Next.js",
      "UI"
    ],
    "available": true
  },
  "settings": {
    "theme": "ocean",
    "refreshSeconds": 30
  }
}

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