Forms API 400 bad request with C# HttpRequest

Developer Support APIs & Integrations
1

Hi there,

I’m new to using HubSpot, and am having trouble getting a successful POST to the API server.

I have setup an HttpRequest which sends some JSON data to the Forms API based on the example information in the API docs.

My request URL: https://api.hsforms.com/submissions/v3/integration/secure/submit/\/<formid>?hapikey=

The JSON string I am sending is formatted like so:

“{\“submittedAt\”:\“637583940787178861\”,\“fields\”:{\“home_club\”:\“test\”,\“firstname\”:\“test\”,\“lastname\”:\“qweqw\”,\“date_of_birth_datepicker___YYYY\”:\“1985\”,\“date_of_birth_datepicker___MM\”:\“01\”,\“date_of_birth_datepicker___DD\”:\“02\”,\“membership_number\”:\“12345\”,\“mobilephone\”:\“0123456789\”,\“email\”:\“test@test.com\”,\“cancellation_date__YYYY\”:\“2021\”,\“cancellation_date__MM\”:\“08\”,\“cancellation_date__DD\”:\“09\”,\“reason_for_cancellation\”:\“Medical\”,\“cancellation_terms___conditions\”:\“on\”}}”

I copied the field names from an embedded form that matches the formId, but for other reasons, I need to post this data using the API and not using the HubSpot embedded form.

Below is my C# reference code:

var httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
httpWebRequest.ContentType = “application/json”;
httpWebRequest.Method = “POST”;

var fields = new Dictionary<string, string>();
fields.Add(…);

string json = JsonConvert.SerializeObject(new
{
submittedAt = new DateHelper().GetCurrentNZTime().Ticks.ToString(),
fields = fields
}) ;

using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
{
streamWriter.Write(json);
}

var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
{
var result = streamReader.ReadToEnd();
}

The response is coming back as 400 - Bad Request. HubSpot support has asked me to look here for help.

Thank you.

2

Hey @DMcLellan

That timestamp for submittedAt looks suspicious

Should be in milliseconds and can only be used to backdate a submission.

I would consider removing it from you body and see if that works. If it does and you need it, you will want to make sure that it is in milliseconds

3

Hi @dennisedson and thanks for the reply.

I have also been working with support on this and they too identified that the milliseconds portion of my data was incorrect.

I have modified my json string and now have the correct formatting. Below is the new formatting which is still giving me a 400 - Bad Request.

This is the string after JSON.stringify:

“{\“submittedAt\”:\“1622859625723\”,\“fields\”:[{\“name\”:\“home\”,\“value\”:\“test\”},{\“name\”:\“firstname\”,\“value\”:\“test\”},{\“name\”:\“lastname\”,\“value\”:\“qweqw\”},{\“name\”:\“date_of_birth_datepicker_\”,\“value\”:\“473490000000\”},{\“name\”:\“membership_number\”,\“value\”:\“12345\”},{\“name\”:\“mobilephone\”,\“value\”:\“0123456789\”},{\“name\”:\“email\”,\“value\”:\“test@test.com\”},{\“name\”:\“cancellation_date\”,\“value\”:\“1628481600000\”},{\“name\”:\“cancellation_terms___conditions\”,\“value\”:\“true\”}]}”

Any more thoughts on this?

Thank you very much.

4

@DMcLellan

Was that date in the past when you submitted it?

Can you try backdating atlease 24hrs as well as attempting to submit without that date altogether?

5

Hi again @dennisedson and thanks for the reply.

As it turned out through digging through the API docs. When submitting a post to the Forms API, the email field must validate to a real email address. I was testing submissions using test@test.com and originally example@example.com since this is what HubSpot has listed in the docs as example JSON data. It’s a bit contradictory, but that turned out to be the issue.

I appreciate your help, though.

This post can be archived and considered resolved.