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Last updated March 22, 2026

What Is EDN?

EDN (Extensible Data Notation) is a data format created by Rich Hickey for the Clojure ecosystem. It's similar to JSON but richer: it supports more data types natively, including keywords, symbols, sets, tagged literals, and arbitrary precision numbers. EDN is used as the data format for Datomic databases, ClojureScript transit, and many Clojure libraries.

EDN vs JSON

Feature	JSON	EDN
Strings	`"hello"`	`"hello"`
Numbers	`42`, `3.14`	`42`, `3.14`, `42N` (BigInt), `3.14M` (BigDecimal)
Booleans	`true`, `false`	`true`, `false`
Null	`null`	`nil`
Arrays	`[1, 2, 3]`	`[1 2 3]` (vector)
Objects	`{"key": "val"}`	`{:key "val"}` (map with keyword)
Keywords	Not supported	`:keyword`, `:ns/keyword`
Sets	Not supported	`#{1 2 3}`
Comments	Not supported	`; line comment`
Tagged literals	Not supported	`#inst "2026-03-22"`

EDN Example

EDN

; User record in EDN
{:id 42
 :name "Alice"
 :email "alice@example.com"
 :roles #{:admin :user}
 :created-at #inst "2026-01-15T10:30:00Z"
 :settings {:theme :dark
            :notifications true
            :items-per-page 25}}

Reading EDN in Clojure

Clojure

(require '[clojure.edn :as edn])

; Parse EDN string
(edn/read-string "{:name "Alice" :age 30}")
; => {:name "Alice", :age 30}

; Read from file
(with-open [r (java.io.PushbackReader. (clojure.java.io/reader "data.edn"))]
  (edn/read r))

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