609 Error Code - REST API

Question

Hello,
 
I am trying to make a simple Lead update post via Postman to the Marketo API that updates firstName based a lookupField of serialPerson (custom field). I keep getting a 609 - "Unexpected character ('-' (code 45)) in numeric value: expected digit (0-9) to follow minus sign, for valid numeric value" Error Code.
 
My Content-Type is set to application/json and my request is:
{
"action": "createOrUpdate",
"lookupField": "serialPerson",
"input": [{
"serialPerson": 6523,
"firstName": "test"
}]
}
 
Does anyone know what this message is referring to?

Alejandro_Deguz · Accepted Answer

I have solved the issue and is within Postman. I was adding my JSON payload in the body as "form-data". It needed to be in "raw".

https://stackoverflow.com/questions/44582670/json-parsing-error-in-springboot

SanfordWhiteman · Answer

I assume you're POSTing to /rest/v1/leads.json (best to include that information to avoid confusion). Is serialPerson an Integer field in Marketo? The underlying problem is a Jackson (JSON deserialization) error like you might see if had a hyphen on its own, outside of a string and not right before a number, but I don't see a hyphen anywhere in your code, which is weird.

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