JSON (JavaScript Objecte Notation) is a lightweight data-interchange format. 

It is based on a subset of the JavaScript Programming Language,Standard ECMA-262 3rd Edition - December 1999.

JSON is a text format that is completely language independent but uses conventions that are familiar to programmers of the C-family of languages, including C, C++, C#, Java, JavaScript, Perl, Python, Lisp, and many others.

In lisp exists a high performance JSON encoder and decoder, Called Jonathan Currently support: SBCL, CCL.

Example with Jonathan JSON

;; JSON ENCODER

(defclass user ()

  ((user-id :accessor user-id :type integer :initarg :user-id)

   (user-name :accessor user-name :type string :initarg :user-name)

   (user-lastname :accessor user-lastname :type string :initarg :user-lastname)

   (user-email :accessor user-email :type string :initarg :user-email)))

(defmethod %to-json ((obj user))

  (with-object

    (write-key-value "userid" (slot-value obj 'user-id))

    (write-key-value "username" (slot-value obj 'user-name))

    (write-key-value "userlastname" (slot-value obj 'user-lastname))

    (write-key-value "useremail" (slot-value obj 'user-email))))

(defparameter *JSON-ENCODER* nil)

(setf *JSON-ENCODER* (to-json (make-instance 'user

          :user-id 1

          :user-name "Jesus Manuel"

          :user-lastname "Castro Carcia"

          :user-email "jesus@ikkiware.com")))

> *JSON-ENCODER*

"{\"userid\":1,\"username\":\"Jesus Manuel\",\"userlastname\":\"Castro Garcia\",\"useremail\":\"jesus@ikkiware.com\"}"

;; -----------------------------------------------------------------------------------------------------------------

;; DECODER JSON

(defun DECODER-JSON (json-encoder)

  "Return json-encoder as list asociative"

  (jonathan:parse json-encoder :as :alist))

> (DECODER-JSON *JSON-ENCODER*)

(("useremail" . "jesus@ikkiware.com") ("userlastname" . "Castro Carcia")

 ("username" . "Jesus Manuel") ("userid" . 1))

OR

> (REVERSE (DECODER-JSON *JSON-ENCODER*))

(("userid" . 1) ("username" . "Jesus Manuel")

 ("userlastname" . "Castro Carcia") ("useremail" . "jesus@ikkiware.com"))

#json  #JSON #JsonEncoder #JsonDecoder #JAVASCRIPT #JavaScript #JavascriptObjectNotation #Encoder #Decoder #Lisp #Jonathan #JonathanLisp #JsonJonathan