diff --git a/flask_jwt_extended/config.py b/flask_jwt_extended/config.py
index e2cb65e8..c0aacc78 100644
--- a/flask_jwt_extended/config.py
+++ b/flask_jwt_extended/config.py
@@ -240,4 +240,8 @@ def user_claims_key(self):
     def exempt_methods(self):
         return {"OPTIONS"}
 
+    @property
+    def json_encoder(self):
+        return current_app.json_encoder
+
 config = _Config()
diff --git a/flask_jwt_extended/jwt_manager.py b/flask_jwt_extended/jwt_manager.py
index f258f5a9..ab63422b 100644
--- a/flask_jwt_extended/jwt_manager.py
+++ b/flask_jwt_extended/jwt_manager.py
@@ -379,6 +379,7 @@ def _create_refresh_token(self, identity, expires_delta=None):
             expires_delta=expires_delta,
             csrf=config.csrf_protect,
             identity_claim_key=config.identity_claim_key,
+            json_encoder=config.json_encoder
         )
         return refresh_token
 
@@ -395,7 +396,8 @@ def _create_access_token(self, identity, fresh=False, expires_delta=None):
             user_claims=self._user_claims_callback(identity),
             csrf=config.csrf_protect,
             identity_claim_key=config.identity_claim_key,
-            user_claims_key=config.user_claims_key
+            user_claims_key=config.user_claims_key,
+            json_encoder=config.json_encoder
         )
         return access_token
 
diff --git a/flask_jwt_extended/tokens.py b/flask_jwt_extended/tokens.py
index 0750bdb9..4aebb9d8 100644
--- a/flask_jwt_extended/tokens.py
+++ b/flask_jwt_extended/tokens.py
@@ -13,7 +13,8 @@ def _create_csrf_token():
     return str(uuid.uuid4())
 
 
-def _encode_jwt(additional_token_data, expires_delta, secret, algorithm):
+def _encode_jwt(additional_token_data, expires_delta, secret, algorithm,
+                json_encoder=None):
     uid = str(uuid.uuid4())
     now = datetime.datetime.utcnow()
     token_data = {
@@ -31,7 +32,8 @@ def _encode_jwt(additional_token_data, expires_delta, secret, algorithm):
 
 
 def encode_access_token(identity, secret, algorithm, expires_delta, fresh,
-                        user_claims, csrf, identity_claim_key, user_claims_key):
+                        user_claims, csrf, identity_claim_key, user_claims_key,
+                        json_encoder=None):
     """
     Creates a new encoded (utf-8) access token.
 
@@ -70,11 +72,12 @@ def encode_access_token(identity, secret, algorithm, expires_delta, fresh,
 
     if csrf:
         token_data['csrf'] = _create_csrf_token()
-    return _encode_jwt(token_data, expires_delta, secret, algorithm)
+    return _encode_jwt(token_data, expires_delta, secret, algorithm,
+                       json_encoder=json_encoder)
 
 
 def encode_refresh_token(identity, secret, algorithm, expires_delta, csrf,
-                         identity_claim_key):
+                         identity_claim_key, json_encoder=None):
     """
     Creates a new encoded (utf-8) refresh token.
 
@@ -95,7 +98,8 @@ def encode_refresh_token(identity, secret, algorithm, expires_delta, csrf,
     }
     if csrf:
         token_data['csrf'] = _create_csrf_token()
-    return _encode_jwt(token_data, expires_delta, secret, algorithm)
+    return _encode_jwt(token_data, expires_delta, secret, algorithm,
+                       json_encoder=json_encoder)
 
 
 def decode_jwt(encoded_token, secret, algorithm, identity_claim_key,
diff --git a/tests/test_config.py b/tests/test_config.py
index b3149022..c69bfbc6 100644
--- a/tests/test_config.py
+++ b/tests/test_config.py
@@ -3,6 +3,7 @@
 import pytest
 from datetime import timedelta
 from flask import Flask
+from flask.json import JSONEncoder
 
 from flask_jwt_extended import JWTManager
 from flask_jwt_extended.config import config
@@ -56,6 +57,8 @@ def test_default_configs(app):
         assert config.identity_claim_key == 'identity'
         assert config.user_claims_key == 'user_claims'
 
+        assert config.json_encoder is app.json_encoder
+
 
 def test_override_configs(app):
     app.config['JWT_TOKEN_LOCATION'] = ['cookies']
@@ -91,6 +94,11 @@ def test_override_configs(app):
     app.config['JWT_IDENTITY_CLAIM'] = 'foo'
     app.config['JWT_USER_CLAIMS'] = 'bar'
 
+    class CustomJSONEncoder(JSONEncoder):
+        pass
+
+    app.json_encoder = CustomJSONEncoder
+
     with app.test_request_context():
         assert config.token_location == ['cookies']
         assert config.jwt_in_cookies is True
@@ -131,6 +139,8 @@ def test_override_configs(app):
         assert config.identity_claim_key == 'foo'
         assert config.user_claims_key == 'bar'
 
+        assert config.json_encoder is CustomJSONEncoder
+
 
 def test_tokens_never_expire(app):
     app.config['JWT_ACCESS_TOKEN_EXPIRES'] = False
diff --git a/tests/utils.py b/tests/utils.py
index c0ba1b32..f211915f 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -8,7 +8,8 @@ def encode_token(app, token_data):
         token = jwt.encode(
             token_data,
             config.decode_key,
-            algorithm=config.algorithm
+            algorithm=config.algorithm,
+            json_encoder=config.json_encoder
         )
         return token.decode('utf-8')