CRITICAL-JSON-PARSING-ERROR-FIX.mdā¢3.31 kB
# CRITICAL: JSON Parsing Error Investigation
**Task ID**: CRITICAL-JSON-ERROR-001
**Status**: URGENT EXECUTION REQUIRED
**Priority**: CRITICAL
**Owner**: Claude Code
**Created**: 2025-07-03 19:55 EST
**Dependencies**: User error screenshots provided
---
## šØ **CRITICAL ISSUE IDENTIFIED**
User reports multiple JSON parsing errors during composition creation:
```
"Unexpected token 'o', " total: 536," is not valid JSON"
"Unexpected token 'P', " [PERSIST v2"... is not valid JSON"
"Unexpected token 'c', " composition: 501," is not valid JSON"
"Unexpected token 'u', " url: 'http"... is not valid JSON"
"Unexpected token 'h', " hash: '#!/embed/'" is not valid JSON"
"Unexpected token '}', '}' is not valid JSON"
```
## šÆ **ROOT CAUSE ANALYSIS**
**Hypothesis**: v2.8.0 MCP server is generating **malformed JSON responses** due to:
1. **Console logs mixed into JSON output**
2. **Response formatting corruption**
3. **MCP protocol communication broken**
This explains why:
- ā Compositions appear to save but don't visualize
- ā API interception receives corrupted data
- ā Browser automation may be silently failing
## š **IMMEDIATE INVESTIGATION REQUIRED**
### **Step 1: Check JSON Response Format**
```javascript
// In v2.8.0, verify return statement format
return {
content: [
{
type: 'text',
text: `š **COMPOSITION CREATED...` // <- Check for JSON-breaking characters
}
]
};
```
### **Step 2: Remove Console Logs from MCP Responses**
```javascript
// Find and remove any console.log statements that could interfere with JSON
// Check for template strings with unescaped quotes or special characters
```
### **Step 3: Validate MCP Protocol Compliance**
```javascript
// Ensure all responses follow strict MCP JSON schema:
{
"content": [
{
"type": "text",
"text": "properly escaped string content"
}
]
}
```
### **Step 4: Test Minimal Response**
```javascript
// Create test version with minimal JSON response to isolate issue
return {
content: [{
type: 'text',
text: 'Test composition created successfully'
}]
};
```
## š ļø **LIKELY FIXES NEEDED**
### **Fix A: Clean Up Response Text**
- Remove console log artifacts from response strings
- Escape special characters in response text
- Ensure valid JSON formatting
### **Fix B: Separate Logging from Responses**
- Move all console.log to separate logging mechanism
- Don't include debug info in MCP response text
- Clean response formatting
### **Fix C: Response Validation**
- Add JSON validation before returning responses
- Test response format compliance
- Implement error handling for malformed responses
## ā
**SUCCESS CRITERIA**
1. **No JSON parsing errors** in Claude Desktop during composition creation
2. **Clean MCP responses** that parse correctly
3. **Composition visualization working** after JSON fix
4. **Maintained automation** with proper response handling
## š **EXPECTED IMPACT**
Fixing the JSON parsing errors will likely **resolve the visualization issue** because:
- API interception will receive properly formatted composition data
- Browser automation will execute without JSON corruption
- MCP communication will work as intended
---
**EXECUTE IMMEDIATELY - JSON errors are blocking core functionality**