diff --git a/README.md b/README.md
index d5a042e..a1033aa 100644
--- a/README.md
+++ b/README.md
@@ -27,7 +27,8 @@ swaggerui_blueprint = get_swaggerui_blueprint(
     SWAGGER_URL,  # Swagger UI static files will be mapped to '{SWAGGER_URL}/dist/'
     API_URL,
     config={  # Swagger UI config overrides
-        'app_name': "Test application"
+        'app_name': "Test application",
+        'requestInterceptor' : 'function requestInterceptor(request) {return request;}'
     },
     # oauth_config={  # OAuth config. See https://github.com/swagger-api/swagger-ui#oauth2-configuration .
     #    'clientId': "your-client-id",
@@ -52,6 +53,9 @@ app.run()
 The blueprint supports overloading all Swagger UI configuration options that can be JSON serialized.
 See https://github.com/swagger-api/swagger-ui#parameters for options.
 
-Plugins and function parameters are not supported at this time.
+Function parameters are supported in the form of strings that are evaluated as javascript. They must
+define a function that is of the same name as the parameter.
+
+Plugins are not supported at this time.
 
 OAuth2 parameters can be found at https://github.com/swagger-api/swagger-ui#oauth2-configuration .
diff --git a/flask_swagger_ui/templates/index.template.html b/flask_swagger_ui/templates/index.template.html
index 127ef4c..0e0e0b8 100644
--- a/flask_swagger_ui/templates/index.template.html
+++ b/flask_swagger_ui/templates/index.template.html
@@ -48,6 +48,33 @@
 var user_config = {{config_json|safe}};  // User config options provided from Python code
 for (var attrname in user_config) { config[attrname] = user_config[attrname]; }
 
+// Parse a string to a javascript function.
+// If it's not possible to parse it to a function, return the string.
+function parse_function(function_name, value) {
+  try {
+    eval(value);
+    var evaluated_value = eval(function_name);
+    if (typeof(evaluated_value) === 'function') {
+        return evaluated_value;
+    } else {
+      console.error(`error evaluating function for config attribute ${attrname}. Not a function (${typeof(evaluated_value)}).`);
+    }
+  }
+  catch(e) {
+    console.error(`error evaluating function "${user_config[attrname]}" for config attribute ${attrname}. Exception: `, e);
+  }
+
+  return value;
+}
+
+// For all the function attributes, parse them if they're present.
+var function_attrs = ["requestInterceptor", "responseInterceptor", "operationsSorter", "tagsSorter", "onComplete"];
+function_attrs.forEach(function f(function_attr) {
+  if (function_attr in config) {
+    config[function_attr] = parse_function(function_attr, config[function_attr])
+  }
+});
+
 window.onload = function() {
   // Build a system
   const ui = SwaggerUIBundle(config)