diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..a97cfcd
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+spore-gateway
diff --git a/internal/server/server.go b/internal/server/server.go
index 7c4600a..d5d6bab 100644
--- a/internal/server/server.go
+++ b/internal/server/server.go
@@ -597,12 +597,20 @@ func (hs *HTTPServer) proxyCall(w http.ResponseWriter, r *http.Request) {
 	params := make(map[string]interface{})
 	for _, param := range requestBody.Params {
 		if name, ok := param["name"].(string); ok {
-			// Create parameter object with type and location info
+			// Create parameter object preserving UI-provided metadata
 			paramObj := map[string]interface{}{
-				"location": "body",
+				"location": "body",   // default location
 				"type":     "string", // default type
 			}
 
+			// Preserve the UI's location and type information
+			if location, ok := param["location"].(string); ok && location != "" {
+				paramObj["location"] = location
+			}
+			if paramType, ok := param["type"].(string); ok && paramType != "" {
+				paramObj["type"] = paramType
+			}
+
 			// Extract the actual value from the parameter object
 			if value, ok := param["value"]; ok {
 				paramObj["value"] = value
@@ -610,22 +618,8 @@ func (hs *HTTPServer) proxyCall(w http.ResponseWriter, r *http.Request) {
 				paramObj["value"] = param
 			}
 
-			// Check if we have type information from the endpoint definition
-			// For now, we'll detect JSON by checking if the value is a JSON string
-			if value, ok := paramObj["value"].(string); ok {
-				// Special handling for labels parameter - it expects raw JSON string
-				if name == "labels" {
-					paramObj["type"] = "json"
-					// Keep the value as string for labels parameter
-				} else {
-					// Try to parse as JSON to detect if it's a JSON parameter
-					var jsonValue interface{}
-					if err := json.Unmarshal([]byte(value), &jsonValue); err == nil {
-						paramObj["type"] = "json"
-						paramObj["value"] = jsonValue
-					}
-				}
-			}
+			// Keep the value as-is, don't try to auto-detect JSON
+			// The UI will specify the correct type, and the client will handle it appropriately
 
 			params[name] = paramObj
 		}
diff --git a/pkg/client/client.go b/pkg/client/client.go
index addb134..4b778cc 100644
--- a/pkg/client/client.go
+++ b/pkg/client/client.go
@@ -269,24 +269,18 @@ func (c *SporeClient) buildProxyRequest(method, targetURL string, params map[str
 	var contentType string
 
 	if method != "GET" && params != nil {
-		// Check if we have JSON parameters
-		hasJSONParams := false
-		jsonParams := make(map[string]interface{})
+		// Use form-encoded data for all body parameters (matching index-standalone.js behavior)
 		form := make(map[string][]string)
 		query := make(map[string][]string)
 
 		for name, value := range params {
 			location := "body"
-			paramType := "string"
 
-			// Check if value is a parameter object with location and type info
+			// Check if value is a parameter object with location info
 			if paramObj, ok := value.(map[string]interface{}); ok {
 				if loc, exists := paramObj["location"].(string); exists {
 					location = loc
 				}
-				if ptype, exists := paramObj["type"].(string); exists {
-					paramType = ptype
-				}
 				// Extract the actual value
 				if val, exists := paramObj["value"]; exists {
 					value = val
@@ -307,17 +301,9 @@ func (c *SporeClient) buildProxyRequest(method, targetURL string, params map[str
 					targetURL = strings.ReplaceAll(targetURL, placeholder, fmt.Sprintf("%v", value))
 				}
 			default:
-				// Special handling for certain parameters that expect form-encoded data
-				// even when marked as "json" type
-				if paramType == "json" && name == "labels" {
-					// The labels parameter expects form-encoded data, not JSON
-					form[name] = append(form[name], fmt.Sprintf("%v", value))
-				} else if paramType == "json" {
-					hasJSONParams = true
-					jsonParams[name] = value
-				} else {
-					form[name] = append(form[name], fmt.Sprintf("%v", value))
-				}
+				// Use form-encoded data for all body parameters (matching index-standalone.js behavior)
+				// This is simpler and more reliable than trying to detect JSON automatically
+				form[name] = append(form[name], fmt.Sprintf("%v", value))
 			}
 		}
 
@@ -338,17 +324,8 @@ func (c *SporeClient) buildProxyRequest(method, targetURL string, params map[str
 			targetURL = urlObj.String()
 		}
 
-		// Create request body
-		if hasJSONParams {
-			// Send JSON body
-			jsonData, err := json.Marshal(jsonParams)
-			if err != nil {
-				return nil, fmt.Errorf("failed to marshal JSON params: %w", err)
-			}
-			body = strings.NewReader(string(jsonData))
-			contentType = "application/json"
-		} else if len(form) > 0 {
-			// Send form-encoded body
+		// Create request body - always use form-encoded data for consistency
+		if len(form) > 0 {
 			data := url.Values{}
 			for key, values := range form {
 				for _, value := range values {