Playground

Write a yRest db.yml file and see the ER diagram update in real time.
The editor validates _rel relations, checks that targets exist, and flags deprecated bare keys.

db.yml Load example… Minimal — basic collections Relations — m2o + m2m Full — custom routes + SSE

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ER Diagram drag · scroll to zoom · dbl-click to reset

What is highlighted

Token	Color	Example
Reserved keys	Blue	_rel, _method, _response
Relation types	Purple	many2one, m2m
Cardinality	Amber	1..1, 0..n
Template variables	Green	{{now}}, {{body.email}}

How to use the editor

• Errors appear with a red underline and in the gutter panel at the bottom of the editor.
• Warnings (deprecated keys, unknown relation targets) appear with an amber underline.
• Use Load example to switch between starter templates.
• Copy sends the current YAML to your clipboard.
• The ER Diagram panel updates automatically as you type (with a short debounce).
• Drag nodes, scroll to zoom, double-click to reset the diagram view.