dataspex

Dataspex

Dataspex is a Clojure(Script) data browser that lets you inspect maps, vectors, atoms, database connections, and tap streams in a point-and-click UI. It runs as a Chrome/Firefox browser extension or as a standalone web app, and connects to local ClojureScript apps, Clojure REPLs, or remote processes.

Coordinates: no.cjohansen/dataspex {:mvn/version "2026.04.1"}.

Quick Decision: What do you need?

Task	Go to
Add Dataspex to a project, call inspect, manage the server	setup-and-api.md
Inspect atoms, taps, Datascript/Datomic connections, remote data	inspecting-data.md
Implement custom rendering for your own types	custom-rendering.md
Connect the browser extension, serve remotely, inspect from mobile/Safari	remote-and-server.md
Data not showing up, server not starting, atom not updating, history wrong	anti-patterns.md

Core Mental Model

Dataspex is a data browser, not a logger. Its core flow is:

value / atom / db → dataspex.core/inspect → Dataspex UI → point-and-click navigation

• inspect is the single entry point for all data types. Pass a label and a value.
• Atoms and watchable refs are tracked automatically — changes produce an audit trail.
• The JVM version starts an HTTP server on port 7117 so the browser extension can connect.
• The ClojureScript version runs in-process inside your app; the extension reads from devtools.
• Use uninspect to stop tracking a label and release any watchers.