QDevSee what's inside
without expanding it.
A collapsed object or array isn't a dead end. QDev shows a compact peek of its contents inline, a fuller popover on hover, and the same hints on graph nodes — so you can scan a document without opening every branch.
The inline peek
When a container is collapsed, its row shows a one-line summary of what's inside — the first few members, recursing one level into nested containers, then +N for the rest:
The peek leads with an identifying field when it can find one — a name, title, id, or similar — so the summary is actually useful, not just the first key alphabetically. Values are clipped to keep it to one line, and a node that's still streaming (not yet loaded) shows a plain {…} or […]until it's available.
Hover for more
Hover the inline peek of a collapsed object and a popover opens with a fuller, vertical view — the field count, up to eight key/value pairs (each value clipped to a readable length), then +N more. It flips above or below the row to stay on screen. Arrays don't get the popover — their inline peek already reads top to bottom.
Previews in the graph
The Graph view mirrors the same idea: each node card shows a representative field or a container peek for its links, and hovering a link row opens the same popover you get in the tree — so you can read a graph without expanding every node.
Tune it in Tree settings
Open the gear icon and go to the Tree tab to control how values and previews render:
You can also drag the gutter rule to resize where values sit. Previews themselves are always on for collapsed containers — there's no need to enable them.
Previews let you read a document's shape at a glance — no clicking required.