Mobile sales API fails to sync deal data with HubSpot CRM in real-time

CRM HubSpot
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1

Our mobile sales app is failing to sync deal data to HubSpot CRM. Getting 400 Bad Request errors when attempting to create or update deals from the mobile app.

API request body:


{
  "properties": {
    "dealname": "Enterprise Deal",
    "amount": "50000"
  }
}

Error: `{“status”:“error”,“message”:“Property validation failed”,“validationErrors”:[{“field”:“amount”,“message”:“Invalid value type”}]} The same data structure works when testing via Postman, but fails from the mobile app. We’re on hs-2023 and this is severely impacting our field sales productivity. Any ideas on what required fields might be missing or how to properly debug these API request body validation errors?

system 2

I’ve troubleshot this exact scenario multiple times with mobile sales apps. The issue is a combination of data type handling and missing required fields. Here’s the comprehensive solution:

1. API Request Body - Correct Data Types: HubSpot’s deal API is strict about data types. Update your mobile app’s request formatting:


{
  "properties": {
    "dealname": "Enterprise Deal",
    "amount": 50000,
    "dealstage": "appointmentscheduled",
    "pipeline": "default",
    "closedate": "2025-12-31"
  }
}

Key changes:

  • amount: Numeric value (no quotes)
  • dealstage: Required field with valid stage ID
  • pipeline: Required field (use “default” or specific pipeline ID)
  • closedate: ISO date format (YYYY-MM-DD)

2. Required Fields Validation: In hs-2023, deals require these minimum fields:

  • dealname (string)
  • amount (number)
  • dealstage (valid stage from your pipeline)
  • pipeline (valid pipeline ID)
  • closedate (ISO date string)

To get valid dealstage and pipeline values, make a GET request first:


GET /crm/v3/pipelines/deals

This returns all pipelines and their stages. Use the actual stage IDs from this response.

3. Error Debugging Strategy: The validation error only shows the first failed field. To debug systematically:

a) Add fields incrementally:

  • Start with just dealname
  • Add amount (as number)
  • Add dealstage, pipeline, closedate
  • Test after each addition

b) Validate data types in mobile app:

  • Ensure JSON serialization converts numbers correctly
  • Check that date formatting matches ISO standard
  • Verify no null values are sent as empty strings

c) Enable request/response logging:

  • Log the exact JSON being sent from mobile app
  • Compare with working Postman request character-by-character
  • Check for encoding issues (UTF-8 vs other)

4. Mobile-Specific Issues:

Common mobile framework problems:

  • iOS/Swift: Ensure Codable structs use correct types (Int/Double for numbers, not String)
  • Android/Kotlin: Verify Gson/Moshi serialization doesn’t convert numbers to strings
  • React Native: Check that numeric state values aren’t accidentally stringified
  • Flutter: Ensure JSON encoding uses toJson() with proper type declarations

5. Additional Required Properties: Check for custom required properties in your HubSpot account:

  • Go to Settings > Properties > Deal Properties
  • Filter by “Required” = Yes
  • Add all required custom properties to your mobile app’s request body

6. Testing Approach: Create a test endpoint that echoes back the exact request body your mobile app sends. This helps identify:

  • Data type issues (string vs number)
  • Missing fields
  • Encoding problems
  • Extra whitespace or special characters

Implementation in Mobile App: Update your mobile API client to validate data types before sending:


// Pseudocode for mobile validation:
1. Validate amount is numeric (not string)
2. Validate dealstage matches allowed stages from pipeline
3. Validate closedate is valid ISO format
4. Ensure all required custom properties are included
5. Log complete request body before sending
6. Capture full error response for debugging

After implementing these changes, your mobile sales app should successfully sync deal data. The key is ensuring numeric types are sent as numbers (not strings) and all required fields are included with valid values from your HubSpot configuration.

This draft is based on general HubSpot knowledge. It has not been verified against your specific version and environment. Practitioners: verify the steps and share your experience below.

3

The amount field needs to be a number not a string. Change "amount": "50000" to "amount": 50000 without quotes. That’s causing the validation error.

4

Good catch! I’ll update the mobile app to send numeric values. But are there other required fields for deal creation that might not be obvious? The error message only mentions the amount field.

5

Yes, deal creation requires several fields beyond just name and amount. You need dealstage, pipeline, and closedate at minimum. The pipeline must be a valid pipeline ID from your HubSpot account. If you’re missing dealstage, it will default to the first stage but it’s better to specify it explicitly. Also ensure your mobile app is sending proper Content-Type headers (application/json) and the request encoding is UTF-8. I’ve seen mobile frameworks sometimes send data with incorrect encoding which causes validation failures.

6

Check if your mobile app is properly handling null values. Sometimes mobile frameworks serialize empty fields as empty strings instead of omitting them, which causes HubSpot validation to fail.

carlos_guru 7

“Tested this on our React Native sales app — fixing amount to a numeric type and adding the required dealstage field resolved our HubSpot deal sync failures immediately.”

8

Another thing - verify the mobile app’s API key has the correct scopes for deal creation. In hs-2023, you need crm.objects.deals.write scope specifically. Also check if there are any custom required properties on your deal object that the mobile app isn’t sending. You can see required properties in Settings > Properties > Deal Properties and filter by “Required”.

9

Debug by enabling verbose logging in your mobile HTTP client. Capture the exact request body, headers, and response. Compare byte-by-byte with your working Postman request to find differences in encoding or formatting.