Drawlize — design JSON & YAML structures visually

Drawlize is a free, browser-based designer for hierarchical data. Add objects and arrays as blocks on a canvas, fill in string, number, boolean and null values, and the code is generated as you work — as JSON or YAML, whichever you prefer, switchable at any time. Paste existing JSON or YAML and the diagram appears, auto-arranged — the sync runs both ways, and your blocks keep their positions. No account, no backend: documents are saved in your own browser.

• Object and array blocks with typed value rows; nesting drawn as connections.
• One model, two formats: view and edit the code as JSON or YAML.
• Live code with syntax highlighting, and one-click copy.
• Paste existing JSON or YAML and get an auto-laid-out diagram.
• Export your document as a .json or .yaml file.
• Light and dark themes; works offline.