DF0039: Duplicate JSON-Render View
A JSON-render view with id "{id}" already exists in scope "{scope}".
Message
A JSON-render view with id "{id}" already exists in scope "{scope}".
Cause
An author-supplied id forms each view's shared-state key devframe:json-render:<scope>:<id>, so ids must be unique within a scope for the client to keep a stable subscription across reconnects. A second view with the same scoped id throws instead of clobbering the first.
Example
createJsonRenderView(ctx, { id: 'metrics', spec })
createJsonRenderView(ctx, { id: 'metrics', spec }) // ✗ throws DF0039Fix
Give each view a stable id unique within its scope, or dispose the previous view before recreating it. Scope defaults to the context namespace (or global); pass scope to isolate ids explicitly.
Source
packages/json-render/src/node/create-view.ts:createJsonRenderView()throws this when the scoped id is already live.