Awesome Open Source
Awesome Open Source


A clojure tool to navigate through your data.

Clojars Project

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The portal UI can be used to inspect values of various shapes and sizes. The UX will probably evolve over time and user feedback is welcome!

Apropos Demo

To get an overview of portal, you can watch the following recording of a live demo I gave on Apropos.



To start a repl with portal, run the clojure >= 1.10.0 cli with:

clj -Sdeps '{:deps {djblue/portal {:mvn/version "0.12.0"}}}'

or for a web clojurescript >= 1.10.773 repl, do:

clj -Sdeps '{:deps {djblue/portal {:mvn/version "0.12.0"}
                    org.clojure/clojurescript {:mvn/version "1.10.844"}}}' \
    -m cljs.main

or for a node clojurescript >= 1.10.773 repl, do:

clj -Sdeps '{:deps {djblue/portal {:mvn/version "0.12.0"}
                    org.clojure/clojurescript {:mvn/version "1.10.844"}}}' \
    -m cljs.main -re node

or for a babashka >=0.2.4 repl, do:

bb -cp `clj -Spath -Sdeps '{:deps {djblue/portal {:mvn/version "0.12.0"}}}'`

or for examples on how to integrate portal into an existing project, look through the examples directory.


Try the portal api with the following commands:

;; for node and jvm
(require '[portal.api :as p])

;; for web
;; NOTE: you might need to enable popups for the portal ui to work in the
;; browser.
(require '[portal.web :as p])

(p/open) ; Open a new inspector

(add-tap #'p/submit) ; Add portal as a tap> target

(tap> :hello) ; Start tapping out values

(p/clear) ; Clear all values

(tap> :world) ; Tap out more values

(remove-tap #'p/submit) ; Remove portal from tap> targetset

(p/close) ; Close the inspector when done

Portal Atom

For the jvm, bb and web platforms, you can pull values from portal back into your runtime by treating portal as an atom:

(def a (p/open))

; push the value 0 into portal
(reset! a 0)

@a ;=> 0

; inc the current value in portal
(swap! a inc)

@a ;=> 1

The currently selected viewer has the ability to intercept and transform values returned by deref. For example, given a map in portal, you may decide to view it as a coll, and with that viewer selected, deref would return a list of pairs. Not many viewers implement this functionality currently, but expect more to do so in the future.



There are currently three built-in themes:

Which can be passed as an option to p/open:

  {:portal.colors/theme :portal.colors/nord})


By default, when p/open is called, an HTTP server is started on a randomly chosen port. It is also given a default window title of the form portal - <platform> - <version>. To control this server's port, host, and window title, call the p/start function with the following options:

Option Description If not specified
:portal.launcher/port Port used to access UI random port selected
:portal.launcher/host Hostname used to access UI "localhost"
:portal.launcher/app Launch as separate window true
:portal.launcher/window-title Custom title for UI window "portal"

Datafy and Nav

There is one exception to the behavior described above for the UI, datafy and nav. They are extension points defined in clojure to support user defined logic for transforming anything into clojure data and how to traverse it.

For a great overview of datafy and nav, I recommend reading Clojure 1.10's Datafy and Nav by Sean Corfield.

The below will demonstrate the power of datafy and nav by allowing you to traverse the hacker news api! It will produce data tagged with metadata on how to get more data!

(require '[examples.hacker-news :as hn])

(tap> hn/stories)

An interesting use case for nav is allowing users to nav into keywords to produce documentation for that keyword. This really highlights the power behind datafy and nav. It becomes very easy to tailor a browser into the perfect development environment!

CLI Usage

Add a portal alias in ~/.clojure/deps.edn

{:main-opts ["-m" "portal.main"]
 {djblue/portal {:mvn/version "0.12.0"}
  ;; optional json support
  cheshire/cheshire {:mvn/version "5.10.0"}
  ;; optional yaml support
  clj-commons/clj-yaml {:mvn/version "0.7.0"}}}

Then do the following depending on your data format:

cat data | clojure -M:portal/cli [edn|json|transit|yaml]
# or with babashka for faster startup
cat data | bb -cp `clojure -Spath -M:portal/cli` -m portal.main [edn|json|transit|yaml]

I keep the following bash aliases handy for easier CLI use:

alias portal='bb -cp `clojure -Spath -M:portal/cli` -m portal.main'
alias edn='portal edn'
alias json='portal json'
alias transit='portal transit'
alias yaml='portal yaml'

and often use the Copy as cURL feature in the chrome network tab to do the following:

curl ... | transit

Emacs Integration

If you are an emacs + cider user and would like tighter integration with portal, the following section may be of interest to you.

;; Leverage an existing cider nrepl connection to evaluate portal.api functions
;; and map them to convenient key bindings.

(defun portal.api/open ()
   "(require 'portal.api) (portal.api/tap) (portal.api/open)"))

(defun portal.api/clear ()
  (cider-nrepl-sync-request:eval "(portal.api/clear)"))

(defun portal.api/close ()
  (cider-nrepl-sync-request:eval "(portal.api/close)"))

;; Example key mappings for doom emacs
(map! :map clojure-mode-map
      ;; cmd  + o
      :n "s-o" #'portal.api/open
      ;; ctrl + l
      :n "C-l" #'portal.api/clear)

;; NOTE: You do need to have portal on the class path and the easiest way I know
;; how is via a clj user or project alias.
(setq cider-clojure-cli-global-options "-A:portal")


  • Support as much of clojure's data as possible
  • First class support for async extensibility
  • Simple standalone usage without a clojure environment
  • Easy theming

Prior Art

Ideas for the Future

  • Diff Viewer
  • Markdown Viewer
    • Any string can be viewed as markdown in portal via yogthos/markdown-clj
    • Any hiccup data structure can also be viewed as html
  • Chart Viewer
  • Node+Edge Graphs Viewer


vim + vim-fireplace

To start the nrepl server, do:

make dev

vim-fireplace should automatically connect upon evaluation, but this will only be for clj files, to get a cljs repl, do:

:CljEval (user/cljs)

emacs + cider

The best way to get started via emacs is to have cider start the repl, do:

M-x cider-jack-in-clj&cljs

.dir-locals.el has all the configuration variables for cider.


The user.clj namespace has a bunch of useful examples and code for development. Take a peek to get going.


To format source code, do:

make fmt

CI Checks

To run all ci checks, do:

make ci

E2E Testing

To run the e2e tests in the jvm, node and web environments, do:

make e2e

NOTE: these aren't fully automated tests. They depend on a human for verification and synchronization but it beats having to type everything out manually into a repl.


To deploy to a release to clojars, bump the version and do:

make set-version deploy

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