Page not found error displayed on browser for serverless function

Develop, Build & Integrate APIs & Integrations
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1

I referred link Get started with serverless functions - HubSpot docs to create serverless function.

This is my hubspot.config.yml:

defaultPortal: HubSpot_Assignment

portals:

- name: HubSpot_Assignment

portalId: 8943172

authType: personalaccesskey

auth:

  tokenInfo:

    accessToken: >-

     XXX

    expiresAt: '2021-06-07T10:19:46.023Z'

personalAccessKey: >-

  XXX

My congratulation.js file is as follows:

exports.main = (context, sendResponse) => {

// your code called when the function is executed

const functionResponse = "Congrats! You've just deployed a Serverless Function."

// sendResponse is a callback function you call to send your response.

sendResponse({body: functionResponse, statusCode: 200});

};

I tried to access this url https://api.hubapi.com/_hcms/api/congratulation

But I am getting

Page Not Found Error

on Browser

2

Hi everyone! :waving_hand:

Just adding a quick update for anyone coming across this thread.

The original solution still applies: CMS serverless functions should be accessed through a domain connected to your HubSpot account, rather than api.hubapi.com.

For example, a CMS serverless endpoint would use a URL like:

https://yourdomain.com/_hcms/api/your-endpoint

Keep in mind that HubSpot’s serverless functionality has evolved since this discussion in 2021. Project-based serverless functions are also available in Developer Platform 2026.03, with a different endpoint structure and configuration.

For current setup instructions, I’d recommend checking HubSpot’s serverless functions documentation.

Hope this helps anyone running into a similar issue! :blush:

@DKachhawaha ,

You are loading the wrong address. It will be available under whatever domain your portal is using.

If your portal domain was example.com, it would be https://www.example.com>/_hcms/api/congratulation

Moderator Note: this post was reviewed for relevancy and optimized for clarity on October 23, 2026. Thank you for your contributions to the HubSpot Community!

3

Thanks for the solution.I am new to this platform.

Could you please tell me where can I find my domain name for my account.

And also the files which i created like javascript files or yml files are they to be created in IDE like VScode or in Design Manager of HubSpot Account

4

@DKachhawaha ,

This kb " Understand and manage system domains " should get you to where your domain is located. If you haven’t set a domain up yet, when you get to the domains settings, it will be empty. Click on language settings and you will see it there.

As for the second question, I recommend using a local web development workflow when possible which I believe was advised in that doc that you referenced above. Here is another doc " HubSpot CLI commands overview - HubSpot docs " that explores it in more detail.

Good luck!