can't generate JSON to Python class

[wongsatornm]

Oops! Houston we have a problem.
Looks like there's an unhandled error or your input is not properly formatted. You can report it to the developer by clicking on the "Report To Dev" button. Or you can report it on Github using "Report An Issue".
Exception:
System.NotSupportedException: Unsupported json type: NullableDate at Xamasoft.JsonClassGenerator.CodeWriters.PythonCodeWriter.GetTypeName(JsonType type) in C:\Users\Hilal\OneDrive\Desktop\Json2CSharpCodeGenerator\JsonClassGeneratorLib\CodeWriters\PythonCodeWriter.cs:line 54 at Xamasoft.JsonClassGenerator.JsonType.GetTypeName() in C:\Users\Hilal\OneDrive\Desktop\Json2CSharpCodeGenerator\JsonClassGeneratorLib\JsonType.cs:line 157 at Xamasoft.JsonClassGenerator.CodeWriters.PythonCodeWriter.WriteClassMembers(StringBuilder sw, JsonType type, String prefix) in C:\Users\Hilal\OneDrive\Desktop\Json2CSharpCodeGenerator\JsonClassGeneratorLib\CodeWriters\PythonCodeWriter.cs:line 142 at Xamasoft.JsonClassGenerator.CodeWriters.PythonCodeWriter.WriteClass(StringBuilder sw, JsonType type) in C:\Users\Hilal\OneDrive\Desktop\Json2CSharpCodeGenerator\JsonClassGeneratorLib\CodeWriters\PythonCodeWriter.cs:line 95 at Xamasoft.JsonClassGenerator.CodeWriters.PythonCodeWriter.WriteClassesToFile(StringBuilder sw, IEnumerable`1 types, Boolean rootIsArray) in C:\Users\Hilal\OneDrive\Desktop\Json2CSharpCodeGenerator\JsonClassGeneratorLib\CodeWriters\PythonCodeWriter.cs:line 122 at Xamasoft.JsonClassGenerator.JsonClassGenerator.GenerateClasses(String jsonInput, String& errorMessage) in C:\Users\Hilal\OneDrive\Desktop\Json2CSharpCodeGenerator\JsonClassGeneratorLib\JsonClassGenerator.cs:line 78

[wongsatornm]

[hilalhakla]

Do you remember the input that you used ?

[justinh-kliksupport]

I got the same. If you need input here is the JSON response from an API call. I did do a JSON validate and it indicated the JSON is valid.

{
"items": [
{
"id": 1361,
"additionalAddressInformation": "",
"address1": "1111 Gulf Perry Road",
"address2": null,
"alternatePhone1": "",
"alternatePhone2": "",
"apiVendorID": null,
"assetValue": null,
"billToCompanyLocationID": null,
"billToAdditionalAddressInformation": "",
"billingAddress1": "1111 Gulf Perry Road",
"billingAddress2": "",
"billToAddressToUse": 1,
"billToAttention": "",
"billToCity": "Ijamsville",
"billToCountryID": 237,
"billToState": "MD",
"billToZipCode": "21754",
"city": "Ijamsville",
"classification": 17,
"companyCategoryID": 1,
"companyName": "Cool Management, LLC",
"companyNumber": "",
"companyType": 1,
"competitorID": null,
"countryID": 237,
"createDate": "2023-09-06T13:26:12.71Z",
"createdByResourceID": 29682902,
"currencyID": 1,
"fax": "",
"impersonatorCreatorResourceID": null,
"invoiceEmailMessageID": 1,
"invoiceMethod": 2,
"invoiceNonContractItemsToParentCompany": false,
"invoiceTemplateID": 117,
"isActive": true,
"isClientPortalActive": true,
"isEnabledForComanaged": false,
"isTaskFireActive": false,
"isTaxExempt": false,
"lastActivityDate": "2025-04-22T19:12:00.243Z",
"lastTrackedModifiedDateTime": "2025-05-06T12:59:39.757Z",
"marketSegmentID": 29683400,
"ownerResourceID": 29682952,
"parentCompanyID": null,
"phone": "301-986-6900",
"postalCode": "21754",
"purchaseOrderTemplateID": null,
"quoteEmailMessageID": 2,
"quoteTemplateID": 1,
"sicCode": "",
"state": "MD",
"stockMarket": "",
"stockSymbol": "",
"surveyCompanyRating": null,
"taxID": "",
"taxRegionID": 2,
"territoryID": null,
"webAddress": "www.roses.com",
"userDefinedFields": [
{
"name": "Average Contact Accuracy",
"value": null
},
{
"name": "Cloud Engineer",
"value": "Michael C"
},
{
"name": "Current Lead Status:",
"value": null
},
{
"name": "CW_CompanyType",
"value": null
},
{
"name": "delete",
"value": null
},
{
"name": "Digital Marketing SME (MDMS)",
"value": null
},
{
"name": "Fiscal Year End",
"value": null
},
{
"name": "Infrastructure & Systems Engineer (MITS)",
"value": "Chris Adams"
},
{
"name": "Last TBR:",
"value": null
},
{
"name": "Lead Source Rating:",
"value": null
},
{
"name": "Lead Source:",
"value": "Unknown"
},
{
"name": "Managed IT Tier:",
"value": "Managed Enterprise"
},
{
"name": "Managed Security - Protect - Tier:",
"value": null
},
{
"name": "Number of Employees",
"value": null
},
{
"name": "Security Engineer (MSCS)",
"value": "Daniel W"
},
{
"name": "Service Delivery Manager (SDM)",
"value": "Anna L"
},
{
"name": "Solutions Engineer (SA)",
"value": "David Z"
},
{
"name": "Status",
"value": null
},
{
"name": "Testimonial:",
"value": null
},
{
"name": "ZoomInfo Company Profile URL",
"value": null
},
{
"name": "ZoomInfo Export",
"value": null
}
]
}
],
"pageDetails": {
"count": 1,
"requestCount": 10,
"prevPageUrl": null,
"nextPageUrl": null
}
}

[justinh-kliksupport]

Following up on my first post on this error. I tried a smaller json string that had the word 'null' as a field value. I got the same error as above. I changed the 'null' value to a zero-length string (""), re-ran the convert and it worked.

Looking at pulls requests it seems this was an issue back in 2023 and someone fixed it for maybe another converter (not python?). The issue seems that the program cannot handle (convert) a 'null' value. A manual correction to "" allows the program to work so for now consider that a work around.