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tickets/093-json-viewer-collapsed-by-default.md

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+# 093 — Log-line JSON viewer should default to collapsed, not expanded
+
+## Summary
+
+When a log line's text parses as a JSON object, the frontend renders it
+via a collapsible tree view — but every node starts expanded, so a
+line with a large JSON payload dumps its entire structure into the
+timeline by default instead of showing a collapsed summary the user
+opts into expanding.
+
+## Where
+
+- `webapp/src/components/LogPreview.tsx:97-107` — `JsonValueView`
+  recursively renders JSON values, delegating objects/arrays to
+  `JsonNode`.
+- `webapp/src/components/LogPreview.tsx:109-156` — `JsonNode` renders
+  a collapsible subtree with a ▾/▸ disclosure toggle. Default state is
+  set at line 116: `useState(true)`, i.e. expanded. Each nested
+  object/array has its own independent `expanded` state.
+- `webapp/src/components/LogPreview.tsx:160-164` — `LogMessage` is the
+  per-row entry point: parses the line via `tryParseJsonObject`
+  (`:82-94`) and renders through `JsonValueView` when it succeeds.
+- Empty objects/arrays already short-circuit to plain `{}`/`[]` with
+  no toggle (`:118-125`) — unaffected by this change.
+
+## Scope
+
+- Flip the default in `JsonNode` (`LogPreview.tsx:116`) from
+  `useState(true)` to `useState(false)` so JSON subtrees render
+  collapsed until the user clicks to expand.
+- Since expand state is per-node (not shared across the tree), this
+  changes every node in a JSON log line's tree independently — confirm
+  that's the intended look (top-level object collapsed with `{...}`
+  rather than only nested children collapsing) rather than needing a
+  "expand root, collapse children" split default.