diff --git a/Makefile.am b/Makefile.am
index 38f2d7e690..9839bf27cc 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -184,6 +184,7 @@ MODULES =					\
   guix/build/haskell-build-system.scm		\
   guix/build/linux-module-build-system.scm	\
   guix/build/store-copy.scm			\
+  guix/build/json.scm				\
   guix/build/utils.scm				\
   guix/build/union.scm				\
   guix/build/profiles.scm			\
diff --git a/guix/build-system/node.scm b/guix/build-system/node.scm
index dad492dc95..05c24c47d5 100644
--- a/guix/build-system/node.scm
+++ b/guix/build-system/node.scm
@@ -18,6 +18,7 @@
 
 (define-module (guix build-system node)
   #:use-module (guix store)
+  #:use-module (guix build json)
   #:use-module (guix build union)
   #:use-module (guix utils)
   #:use-module (guix packages)
@@ -26,7 +27,6 @@
   #:use-module (guix build-system)
   #:use-module (guix build-system gnu)
   #:use-module (ice-9 match)
-  #:use-module (json parser)
   #:export (npm-meta-uri
             %node-build-system-modules
             node-build
@@ -40,8 +40,8 @@ registry."
 (define %node-build-system-modules
   ;; Build-side modules imported by default.
   `((guix build node-build-system)
+    (guix build json)
     (guix build union)
-    (json parser)
     ,@%gnu-build-system-modules)) ;; TODO: Might be not needed
 
 (define (default-node)
@@ -88,9 +88,9 @@ registry."
                      (guile #f)
                      (imported-modules %node-build-system-modules)
                      (modules '((guix build node-build-system)
-                                (guix build union)
-                                (guix build utils)
-				(json parser))))
+				(guix build json)
+				(guix build union)
+                                (guix build utils))))
   "Build SOURCE using NODE and INPUTS."
   (define builder
     `(begin
diff --git a/guix/build/json.scm b/guix/build/json.scm
new file mode 100644
index 0000000000..361ea76728
--- /dev/null
+++ b/guix/build/json.scm
@@ -0,0 +1,387 @@
+;;;; json.scm --- JSON reader/writer
+;;;; Copyright (C) 2015 Free Software Foundation, Inc.
+;;;;
+;;;; This library is free software; you can redistribute it and/or
+;;;; modify it under the terms of the GNU Lesser General Public
+;;;; License as published by the Free Software Foundation; either
+;;;; version 3 of the License, or (at your option) any later version.
+;;;;
+;;;; This library is distributed in the hope that it will be useful,
+;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;;;; Lesser General Public License for more details.
+;;;;
+;;;; You should have received a copy of the GNU Lesser General Public
+;;;; License along with this library; if not, write to the Free Software
+;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+;;;;
+
+(define-module (guix build json)  ;; originally (ice-9 json)
+  #:use-module (ice-9 match)
+  #:export (read-json write-json))
+
+;; Snarfed from
+;; https://github.com/cwebber/activitystuff/blob/master/activitystuff/contrib/json.scm
+;; 
+
+;;;
+;;; Reader
+;;;
+
+(define (json-error port)
+  (throw 'json-error port))
+
+(define (assert-char port char)
+  "Read a character from PORT and throw an invalid JSON error if the
+character is not CHAR."
+  (unless (eqv? (read-char port) char)
+    (json-error port)))
+
+(define (whitespace? char)
+  "Return #t if CHAR is a whitespace character."
+  (char-set-contains? char-set:whitespace char))
+
+(define (consume-whitespace port)
+  "Discard characters from PORT until a non-whitespace character is
+encountered.."
+  (match (peek-char port)
+    ((? eof-object?) *unspecified*)
+    ((? whitespace?)
+     (read-char port)
+     (consume-whitespace port))
+    (_ *unspecified*)))
+
+(define (make-keyword-reader keyword value)
+  "Parse the keyword symbol KEYWORD as VALUE."
+  (let ((str (symbol->string keyword)))
+    (lambda (port)
+      (let loop ((i 0))
+        (cond
+         ((= i (string-length str)) value)
+         ((eqv? (string-ref str i) (read-char port))
+          (loop (1+ i)))
+         (else (json-error port)))))))
+
+(define read-true (make-keyword-reader 'true #t))
+(define read-false (make-keyword-reader 'false #f))
+(define read-null (make-keyword-reader 'null #nil))
+
+(define (read-hex-digit port)
+  "Read a hexadecimal digit from PORT."
+  (match (read-char port)
+    (#\0 0)
+    (#\1 1)
+    (#\2 2)
+    (#\3 3)
+    (#\4 4)
+    (#\5 5)
+    (#\6 6)
+    (#\7 7)
+    (#\8 8)
+    (#\9 9)
+    ((or #\A #\a) 10)
+    ((or #\B #\b) 11)
+    ((or #\C #\c) 12)
+    ((or #\D #\d) 13)
+    ((or #\E #\e) 14)
+    ((or #\F #\f) 15)
+    (_ (json-error port))))
+
+(define (read-utf16-character port)
+  "Read a hexadecimal encoded UTF-16 character from PORT."
+  (integer->char
+   (+ (* (read-hex-digit port) (expt 16 3))
+      (* (read-hex-digit port) (expt 16 2))
+      (* (read-hex-digit port) 16)
+      (read-hex-digit port))))
+
+(define (read-escape-character port)
+  "Read escape character from PORT."
+  (match (read-char port)
+    (#\" #\")
+    (#\\ #\\)
+    (#\/ #\/)
+    (#\b #\backspace)
+    (#\f #\page)
+    (#\n #\newline)
+    (#\r #\return)
+    (#\t #\tab)
+    (#\u (read-utf16-character port))
+    (_ (json-error port))))
+
+(define (read-string port)
+  "Read a JSON encoded string from PORT."
+  (assert-char port #\")
+  (let loop ((result '()))
+    (match (read-char port)
+      ((? eof-object?) (json-error port))
+      (#\" (list->string (reverse result)))
+      (#\\ (loop (cons (read-escape-character port) result)))
+      (char (loop (cons char result))))))
+
+(define char-set:json-digit
+  (char-set #\0 #\1 #\2 #\3 #\4 #\5 #\6 #\7 #\8 #\9))
+
+(define (digit? char)
+  (char-set-contains? char-set:json-digit char))
+
+(define (read-digit port)
+  "Read a digit 0-9 from PORT."
+  (match (read-char port)
+    (#\0 0)
+    (#\1 1)
+    (#\2 2)
+    (#\3 3)
+    (#\4 4)
+    (#\5 5)
+    (#\6 6)
+    (#\7 7)
+    (#\8 8)
+    (#\9 9)
+    (else (json-error port))))
+
+(define (read-digits port)
+  "Read a sequence of digits from PORT."
+  (let loop ((result '()))
+    (match (peek-char port)
+      ((? eof-object?)
+       (reverse result))
+      ((? digit?)
+       (loop (cons (read-digit port) result)))
+      (else (reverse result)))))
+
+(define (list->integer digits)
+  "Convert the list DIGITS to an integer."
+  (let loop ((i (1- (length digits)))
+             (result 0)
+             (digits digits))
+    (match digits
+      (() result)
+      ((n . tail)
+       (loop (1- i)
+             (+ result (* n (expt 10 i)))
+             tail)))))
+
+(define (read-positive-integer port)
+  "Read a positive integer with no leading zeroes from PORT."
+  (match (read-digits port)
+    ((0 . _)
+     (json-error port)) ; no leading zeroes allowed
+    ((digits ...)
+     (list->integer digits))))
+
+(define (read-exponent port)
+  "Read exponent from PORT."
+  (define (read-expt)
+    (list->integer (read-digits port)))
+
+  (unless (memv (read-char port) '(#\e #\E))
+    (json-error port))
+
+  (match (peek-char port)
+    ((? eof-object?)
+     (json-error port))
+    (#\-
+     (read-char port)
+     (- (read-expt)))
+    (#\+
+     (read-char port)
+     (read-expt))
+    ((? digit?)
+     (read-expt))
+    (_ (json-error port))))
+
+(define (read-fraction port)
+  "Read fractional number part from PORT as an inexact number."
+  (let* ((digits      (read-digits port))
+         (numerator   (list->integer digits))
+         (denomenator (expt 10 (length digits))))
+    (/ numerator denomenator)))
+
+(define (read-positive-number port)
+  "Read a positive number from PORT."
+  (let* ((integer (match (peek-char port)
+                    ((? eof-object?)
+                     (json-error port))
+                    (#\0
+                     (read-char port)
+                     0)
+                    ((? digit?)
+                     (read-positive-integer port))
+                    (_ (json-error port))))
+         (fraction (match (peek-char port)
+                     (#\.
+                      (read-char port)
+                      (read-fraction port))
+                     (_ 0)))
+         (exponent (match (peek-char port)
+                     ((or #\e #\E)
+                      (read-exponent port))
+                     (_ 0)))
+         (n (* (+ integer fraction) (expt 10 exponent))))
+
+    ;; Keep integers as exact numbers, but convert numbers encoded as
+    ;; floating point numbers to an inexact representation.
+    (if (zero? fraction)
+        n
+        (exact->inexact n))))
+
+(define (read-number port)
+  "Read a number from PORT"
+  (match (peek-char port)
+    ((? eof-object?)
+     (json-error port))
+    (#\-
+     (read-char port)
+     (- (read-positive-number port)))
+    ((? digit?)
+     (read-positive-number port))
+    (_ (json-error port))))
+
+(define (read-object port)
+  "Read key/value map from PORT."
+  (define (read-key+value-pair)
+    (let ((key (read-string port)))
+      (consume-whitespace port)
+      (assert-char port #\:)
+      (consume-whitespace port)
+      (let ((value (read-value port)))
+        (cons key value))))
+
+  (assert-char port #\{)
+  (consume-whitespace port)
+
+  (if (eqv? #\} (peek-char port))
+      (begin
+        (read-char port)
+        '(@)) ; empty object
+      (let loop ((result (list (read-key+value-pair))))
+        (consume-whitespace port)
+        (match (peek-char port)
+          (#\, ; read another value
+           (read-char port)
+           (consume-whitespace port)
+           (loop (cons (read-key+value-pair) result)))
+          (#\} ; end of object
+           (read-char port)
+           (cons '@ (reverse result)))
+          (_ (json-error port))))))
+
+(define (read-array port)
+  "Read array from PORT."
+  (assert-char port #\[)
+  (consume-whitespace port)
+
+  (if (eqv? #\] (peek-char port))
+      (begin
+        (read-char port)
+        '()) ; empty array
+      (let loop ((result (list (read-value port))))
+        (consume-whitespace port)
+        (match (peek-char port)
+          (#\, ; read another value
+           (read-char port)
+           (consume-whitespace port)
+           (loop (cons (read-value port) result)))
+          (#\] ; end of array
+           (read-char port)
+           (reverse result))
+          (_ (json-error port))))))
+
+(define (read-value port)
+  "Read a JSON value from PORT."
+  (consume-whitespace port)
+  (match (peek-char port)
+    ((? eof-object?) (json-error port))
+    (#\" (read-string port))
+    (#\{ (read-object port))
+    (#\[ (read-array port))
+    (#\t (read-true port))
+    (#\f (read-false port))
+    (#\n (read-null port))
+    ((or #\- (? digit?))
+     (read-number port))
+    (_ (json-error port))))
+
+(define (read-json port)
+  "Read JSON text from port and return an s-expression representation."
+  (let ((result (read-value port)))
+    (consume-whitespace port)
+    (unless (eof-object? (peek-char port))
+      (json-error port))
+    result))
+
+
+;;;
+;;; Writer
+;;;
+
+(define (write-string str port)
+  "Write STR to PORT in JSON string format."
+  (define (escape-char char)
+    (display (match char
+               (#\" "\\\"")
+               (#\\ "\\\\")
+               (#\/ "\\/")
+               (#\backspace "\\b")
+               (#\page "\\f")
+               (#\newline "\\n")
+               (#\return "\\r")
+               (#\tab "\\t")
+               (_ char))
+             port))
+
+  (display "\"" port)
+  (string-for-each escape-char str)
+  (display "\"" port))
+
+(define (write-object alist port)
+  "Write ALIST to PORT in JSON object format."
+  ;; Keys may be strings or symbols.
+  (define key->string
+    (match-lambda
+     ((? string? key) key)
+     ((? symbol? key) (symbol->string key))))
+
+  (define (write-pair pair)
+    (match pair
+      ((key . value)
+       (write-string (key->string key) port)
+       (display ":" port)
+       (write-json value port))))
+
+  (display "{" port)
+  (match alist
+    (() #f)
+    ((front ... end)
+     (for-each (lambda (pair)
+                 (write-pair pair)
+                 (display "," port))
+          front)
+     (write-pair end)))
+  (display "}" port))
+
+(define (write-array lst port)
+  "Write LST to PORT in JSON array format."
+  (display "[" port)
+  (match lst
+    (() #f)
+    ((front ... end)
+     (for-each (lambda (val)
+                 (write-json val port)
+                 (display "," port))
+               front)
+     (write-json end port)))
+  (display "]" port))
+
+(define (write-json exp port)
+  "Write EXP to PORT in JSON format."
+  (match exp
+    (#t (display "true" port))
+    (#f (display "false" port))
+    ;; Differentiate #nil from '().
+    ((and (? boolean? ) #nil) (display "null" port))
+    ((? string? s) (write-string s port))
+    ((? real? n) (display n port))
+    (('@ . alist) (write-object alist port))
+    ((vals ...) (write-array vals port))))
diff --git a/guix/build/node-build-system.scm b/guix/build/node-build-system.scm
index 231e60488a..3c0ac2a12b 100644
--- a/guix/build/node-build-system.scm
+++ b/guix/build/node-build-system.scm
@@ -19,12 +19,12 @@
 
 (define-module (guix build node-build-system)
   #:use-module ((guix build gnu-build-system) #:prefix gnu:)
+  #:use-module (guix build json)
   #:use-module (guix build union)
   #:use-module (guix build utils)
   #:use-module (ice-9 match)
   #:use-module (ice-9 popen)
   #:use-module (ice-9 regex)
-  #:use-module (json parser)
   #:use-module (srfi srfi-1)
   #:use-module (srfi srfi-26)
   #:export (%standard-phases
@@ -39,12 +39,12 @@
 (define* (read-package-data #:key (filename "package.json"))
   (call-with-input-file filename
     (lambda (port)
-      (json->scm port))))
+      (read-json port))))
 
 (define* (build #:key inputs #:allow-other-keys)
   (define (build-from-package-json? package-file)
     (let* ((package-data (read-package-data #:filename package-file))
-           (scripts (hash-ref package-data "scripts")))
+           (scripts (assoc-ref package-data "scripts")))
       (assoc-ref scripts "build")))
   "Build a new node module using the appropriate build system."
   ;; XXX: Develop a more robust heuristic, allow override
@@ -103,15 +103,13 @@ the @file{bin} directory."
          (target               (string-append out "/lib"))
          (binaries             (string-append out "/bin"))
          (data                 (read-package-data))
-         (modulename           (hash-ref data "name"))
-         (binary-configuration (match (hash-ref data "bin")
-                                 ((? hash-table? hash-table)
-                                  (hash-map->list cons hash-table))
-                                 ((? string? configuration) configuration)
-                                 (#f #f)))
-         (dependencies (match (hash-ref data "dependencies")
-                         ((? hash-table? hash-table)
-                          (hash-map->list cons hash-table))
+         (modulename           (assoc-ref data "name"))
+         (binary-configuration (match (assoc-ref data "bin")
+				 (('@ configuration ...) configuration)
+				 ((? string? configuration) configuration)
+				 (#f #f)))
+         (dependencies (match (assoc-ref data "dependencies")
+                         (('@ deps ...) deps)
                          (#f #f))))
     (mkdir-p target)
     (copy-recursively "." (string-append target "/node_modules/" modulename))
@@ -123,7 +121,7 @@ the @file{bin} directory."
        (begin
          (mkdir-p binaries)
          (symlink (string-append target "/node_modules/" modulename "/"
-                                 binary-configuration)
+				 binary-configuration)
                   (string-append binaries "/" modulename))))
       ((list? binary-configuration)
        (for-each
@@ -133,12 +131,12 @@ the @file{bin} directory."
               (begin
                 (mkdir-p (dirname (string-append binaries "/" key)))
                 (symlink (string-append target "/node_modules/" modulename "/"
-                                        value)
+					value)
                          (string-append binaries "/" key))))))
          binary-configuration))
       (else
         (symlink (string-append target "/node_modules/" modulename "/bin")
-                 binaries)))
+		 binaries)))
     (when dependencies
       (mkdir-p
         (string-append target "/node_modules/" modulename "/node_modules"))