diff --git a/openflexure_microscope/api/app.py b/openflexure_microscope/api/app.py
index 413d98cb..8f6deb69 100644
--- a/openflexure_microscope/api/app.py
+++ b/openflexure_microscope/api/app.py
@@ -18,7 +18,7 @@ from flask import (
 from flask.views import MethodView
 from werkzeug.exceptions import default_exceptions
 
-from openflexure_microscope.api.utilities import parse_payload, get_from_payload, gen, get_bool, list_routes
+from openflexure_microscope.api.utilities import list_routes
 
 from openflexure_microscope import Microscope, config
 from openflexure_microscope.camera.pi import StreamingCamera
diff --git a/openflexure_microscope/api/v1/blueprints/base.py b/openflexure_microscope/api/v1/blueprints/base.py
index da4205c7..2cddf431 100644
--- a/openflexure_microscope/api/v1/blueprints/base.py
+++ b/openflexure_microscope/api/v1/blueprints/base.py
@@ -1,4 +1,4 @@
-from openflexure_microscope.api.utilities import parse_payload, get_from_payload, gen, get_bool
+from openflexure_microscope.api.utilities import gen
 from openflexure_microscope.api.v1.views import MicroscopeView
 
 from flask import Response, Blueprint, jsonify
diff --git a/openflexure_microscope/api/v1/blueprints/camera/capture.py b/openflexure_microscope/api/v1/blueprints/camera/capture.py
index c2f88395..69c3214b 100644
--- a/openflexure_microscope/api/v1/blueprints/camera/capture.py
+++ b/openflexure_microscope/api/v1/blueprints/camera/capture.py
@@ -1,4 +1,4 @@
-from openflexure_microscope.api.utilities import parse_payload, get_from_payload, gen, get_bool
+from openflexure_microscope.api.utilities import gen, get_bool, JsonPayload
 from openflexure_microscope.api.v1.views import MicroscopeView
 
 from flask import Response, Blueprint, jsonify, request, abort, url_for, redirect, send_file
@@ -97,14 +97,13 @@ class ListAPI(MicroscopeView):
         :<header Content-Type: application/json
         :status 200: capture created
         """
-        state = parse_payload(request)
-        logging.info(state)
+        payload = JsonPayload(request)
 
-        filename = get_from_payload(state, 'filename', default=None)
-        keep_on_disk = bool(get_from_payload(state, 'keep_on_disk', default=True))
-        use_video_port = bool(get_from_payload(state, 'use_video_port', default=False))
+        filename = payload.param('filename')
+        keep_on_disk = payload.param('keep_on_disk', default=True, convert=bool)
+        use_video_port = payload.param('use_video_port', default=False, convert=bool)
 
-        resize = get_from_payload(state, 'size', default=None)
+        resize = payload.param('size', default=None)
         if resize:
             if ('width' in resize) and ('height' in resize):
                 resize = (int(resize['width']), int(resize['height']))  # Convert dict to tuple
@@ -112,8 +111,8 @@ class ListAPI(MicroscopeView):
                 abort(400)
 
         output = self.microscope.camera.new_image(
-            write_to_file=True, 
-            keep_on_disk=keep_on_disk, 
+            write_to_file=True,
+            keep_on_disk=keep_on_disk,
             filename=filename)
 
         self.microscope.camera.capture(
diff --git a/openflexure_microscope/api/v1/blueprints/camera/preview.py b/openflexure_microscope/api/v1/blueprints/camera/preview.py
index 12d59529..284f0018 100644
--- a/openflexure_microscope/api/v1/blueprints/camera/preview.py
+++ b/openflexure_microscope/api/v1/blueprints/camera/preview.py
@@ -1,4 +1,3 @@
-from openflexure_microscope.api.utilities import parse_payload, get_from_payload, gen, get_bool
 from openflexure_microscope.api.v1.views import MicroscopeView
 
 from flask import Response, Blueprint, jsonify, request, abort, url_for, redirect, send_file
diff --git a/openflexure_microscope/api/v1/blueprints/plugins.py b/openflexure_microscope/api/v1/blueprints/plugins.py
index 6cfd69fc..ac794c92 100644
--- a/openflexure_microscope/api/v1/blueprints/plugins.py
+++ b/openflexure_microscope/api/v1/blueprints/plugins.py
@@ -1,4 +1,3 @@
-from openflexure_microscope.api.utilities import parse_payload, get_from_payload, gen, get_bool
 from openflexure_microscope.api.v1.views import MicroscopeViewPlugin
 
 from flask import Response, Blueprint, jsonify
diff --git a/openflexure_microscope/api/v1/blueprints/stage.py b/openflexure_microscope/api/v1/blueprints/stage.py
index cac21159..c1786f30 100644
--- a/openflexure_microscope/api/v1/blueprints/stage.py
+++ b/openflexure_microscope/api/v1/blueprints/stage.py
@@ -1,4 +1,4 @@
-from openflexure_microscope.api.utilities import gen, axes_to_array, JsonResponse
+from openflexure_microscope.api.utilities import gen, axes_to_array, JsonPayload
 from openflexure_microscope.api.v1.views import MicroscopeView
 
 from flask import Response, Blueprint, jsonify, request
@@ -56,22 +56,22 @@ class PositionAPI(MicroscopeView):
 
         """
         # Create response object
-        response = JsonResponse(request)
-        logging.debug(response.json)
+        payload = JsonPayload(request)
+        logging.debug(payload.json)
 
         # Construct position array
         position = [0, 0, 0]
 
         # Handle absolute positioning (calculate a relative move from current position and target)
-        if response.param('absolute') is True:
-            target_position = axes_to_array(response.json, ['x', 'y', 'z'])
+        if payload.param('absolute') is True:
+            target_position = axes_to_array(payload.json, ['x', 'y', 'z'])
             logging.debug("TARGET: {}".format(target_position))
             position = [target_position[i] - self.microscope.stage.position[i] for i in range(3)]
             logging.debug("DELTA: {}".format(position))
 
         else:
             # Get coordinates from payload
-            position = axes_to_array(response.json, ['x', 'y', 'z'], [0, 0, 0])
+            position = axes_to_array(payload.json, ['x', 'y', 'z'], [0, 0, 0])
 
         logging.debug(position)
 
@@ -128,13 +128,13 @@ class StageParamsAPI(MicroscopeView):
 
         """
         # Get payload
-        response = JsonResponse(request)
-        logging.debug(response.json)
+        payload = JsonPayload(request)
+        logging.debug(payload.json)
 
         # BACKLASH
-        if response.param('backlash'):
+        if payload.param('backlash'):
             # Construct backlash array
-            backlash = axes_to_array(response.param('backlash'), ['x', 'y', 'z'], [0, 0, 0])
+            backlash = axes_to_array(payload.param('backlash'), ['x', 'y', 'z'], [0, 0, 0])
             logging.debug("BACKLASH: {}".format(backlash))
 
             # Apply backlash