diff --git a/lib/block.js b/lib/block.js
index 142a1ca..1a2f051 100644
--- a/lib/block.js
+++ b/lib/block.js
@@ -37,7 +37,7 @@ Block._from = function _from(arg) {
   var info = {};
   if (bu.isBuffer(arg)) {
     info = Block._fromBufferReader(BufferReader(arg));
-  } else if (ju.isValidJson(arg)) {
+  } else if (ju.isValidJSON(arg)) {
     info = Block._fromJSON(arg);
   } else if (_.isObject(arg)) {
     info = {
@@ -59,7 +59,7 @@ Block._from = function _from(arg) {
  * @private
  */
 Block._fromJSON = function _fromJSON(data) {
-  if (ju.isValidJson(data)) {
+  if (ju.isValidJSON(data)) {
     data = JSON.parse(data);
   }
   var txs = [];
diff --git a/lib/blockheader.js b/lib/blockheader.js
index 4b10931..0be94d4 100644
--- a/lib/blockheader.js
+++ b/lib/blockheader.js
@@ -34,7 +34,7 @@ BlockHeader._from = function _from(arg) {
   var info = {};
   if (bu.isBuffer(arg)) {
     info = BlockHeader._fromBufferReader(BufferReader(arg));
-  } else if (ju.isValidJson(arg)) {
+  } else if (ju.isValidJSON(arg)) {
     info = BlockHeader._fromJSON(arg);
   } else if (_.isObject(arg)) {
     info = {
@@ -57,7 +57,7 @@ BlockHeader._from = function _from(arg) {
  * @private
  */
 BlockHeader._fromJSON = function _fromJSON(data) {
-  if (ju.isValidJson(data)) {
+  if (ju.isValidJSON(data)) {
     data = JSON.parse(data);
   }
   var info = {
diff --git a/lib/hdprivatekey.js b/lib/hdprivatekey.js
index 0d951d5..a336e8c 100644
--- a/lib/hdprivatekey.js
+++ b/lib/hdprivatekey.js
@@ -45,8 +45,8 @@ function HDPrivateKey(arg) {
     if (_.isString(arg) || bufferUtil.isBuffer(arg)) {
       if (HDPrivateKey.isValidSerialized(arg)) {
         this._buildFromSerialized(arg);
-      } else if (jsUtil.isValidJson(arg)) {
-        this._buildFromJson(arg);
+      } else if (jsUtil.isValidJSON(arg)) {
+        this._buildFromJSON(arg);
       } else {
         throw HDPrivateKey.getSerializedError(arg);
       }
@@ -212,7 +212,7 @@ HDPrivateKey._validateNetwork = function(data, networkArg) {
   return null;
 };
 
-HDPrivateKey.prototype._buildFromJson = function(arg) {
+HDPrivateKey.prototype._buildFromJSON = function(arg) {
   return this._buildFromObject(JSON.parse(arg));
 };
 
@@ -406,7 +406,7 @@ HDPrivateKey.prototype.toString = function() {
  *
  *  @return {Object}
  */
-HDPrivateKey.prototype.toObject = function() {
+HDPrivateKey.prototype.toJSON = function() {
   return {
     network: Network.get(bufferUtil.integerFromBuffer(this._buffers.version)).name,
     depth: bufferUtil.integerFromSingleByteBuffer(this._buffers.depth),
@@ -420,16 +420,6 @@ HDPrivateKey.prototype.toObject = function() {
   };
 };
 
-/**
- * Returns a string with the results from <tt>toObject</tt>
- *
- * @see {HDPrivateKey#toObject}
- * @return {string}
- */
-HDPrivateKey.prototype.toJson = function() {
-  return JSON.stringify(this.toObject());
-};
-
 HDPrivateKey.DefaultDepth = 0;
 HDPrivateKey.DefaultFingerprint = 0;
 HDPrivateKey.DefaultChildIndex = 0;
diff --git a/lib/hdpublickey.js b/lib/hdpublickey.js
index 99ef1ad..8f05419 100644
--- a/lib/hdpublickey.js
+++ b/lib/hdpublickey.js
@@ -41,8 +41,8 @@ function HDPublicKey(arg) {
       var error = HDPublicKey.getSerializedError(arg);
       if (!error) {
         return this._buildFromSerialized(arg);
-      } else if (jsUtil.isValidJson(arg)) {
-        return this._buildFromJson(arg);
+      } else if (jsUtil.isValidJSON(arg)) {
+        return this._buildFromJSON(arg);
       } else {
         if (error instanceof hdErrors.ArgumentIsPrivateExtended) {
           return new HDPrivateKey(arg).hdPublicKey;
@@ -211,7 +211,7 @@ HDPublicKey._validateNetwork = function (data, networkArg) {
   return null;
 };
 
-HDPublicKey.prototype._buildFromJson = function (arg) {
+HDPublicKey.prototype._buildFromJSON = function (arg) {
   return this._buildFromObject(JSON.parse(arg));
 };
 
@@ -366,7 +366,7 @@ HDPublicKey.prototype.toString = function () {
  *  * xpubkey: the string with the base58 representation of this extended key
  *  * checksum: the base58 checksum of xpubkey
  */
-HDPublicKey.prototype.toObject = function () {
+HDPublicKey.prototype.toJSON = function () {
   return {
     network: Network.get(bufferUtil.integerFromBuffer(this._buffers.version)).name,
     depth: bufferUtil.integerFromSingleByteBuffer(this._buffers.depth),
@@ -380,16 +380,6 @@ HDPublicKey.prototype.toObject = function () {
   };
 };
 
-/**
- * Returns the JSON representation of this key's <tt>toObject</tt> result
- *
- * @see {HDPublicKey#toObject}
- * @return {string}
- */
-HDPublicKey.prototype.toJson = function () {
-  return JSON.stringify(this.toObject());
-};
-
 HDPublicKey.Hardened = 0x80000000;
 HDPublicKey.RootElementAlias = ['m', 'M'];
 
diff --git a/lib/util/js.js b/lib/util/js.js
index 9b53732..689b0ac 100644
--- a/lib/util/js.js
+++ b/lib/util/js.js
@@ -23,7 +23,7 @@ module.exports = {
    * @param {string} arg
    * @return {Object|boolean} false if the argument is not a JSON string.
    */
-  isValidJson: function isValidJson(arg) {
+  isValidJSON: function isValidJSON(arg) {
     try {
       return JSON.parse(arg);
     } catch (e) {
diff --git a/test/hdprivatekey.js b/test/hdprivatekey.js
index 2643ddc..b55d1f0 100644
--- a/test/hdprivatekey.js
+++ b/test/hdprivatekey.js
@@ -68,8 +68,8 @@ describe('HDPrivate key interface', function() {
 
   it('builds a json keeping the structure and same members', function() {
     assert(_.isEqual(
-      JSON.parse(new HDPrivateKey(json).toJson()),
-      JSON.parse(new HDPrivateKey(xprivkey).toJson())
+      new HDPrivateKey(json).toJSON(),
+      new HDPrivateKey(xprivkey).toJSON()
     ));
   });
 
diff --git a/test/hdpublickey.js b/test/hdpublickey.js
index 8f28b67..3deb3db 100644
--- a/test/hdpublickey.js
+++ b/test/hdpublickey.js
@@ -106,8 +106,8 @@ describe('HDPublicKey interface', function() {
 
     it('can generate a json that has a particular structure', function() {
       assert(_.isEqual(
-        JSON.parse(new HDPublicKey(json).toJson()),
-        JSON.parse(new HDPublicKey(xpubkey).toJson())
+        new HDPublicKey(json).toJSON(),
+        new HDPublicKey(xpubkey).toJSON()
       ));
     });