How to generate sessionAttributesEncoded for ClickConversion uploads?

[Pradip Poudel]

Hi Google Ads API Team,

I’m working on integrating the Google Ads API (v20) for offline conversion uploads and wanted clarification on how to generate the session_attributes_encoded value.

According to the documentation, the field

conversion[].sessionAttributesEncoded — bytes
“The session attributes for the event, represented as a base64-encoded JSON string. The content should be generated by a Google-provided library.”

However, I haven’t found any public documentation or JavaScript methods in gtag.js or Tag Manager that generate this encoded session token.

Thanks in advance for clarifying the expected approach.

[Google Ads API Forum Advisor]

Hi,

Thank you for reaching out to the Google Ads API support team.

I understand your query regarding the generation of the session_attributes_encoded value. There are two methods to import session attributes: either by providing the encoded token generated by our JavaScript code within the browser or by supplying individual key-value pairs for each identifier. The session attributes for the event are represented as a base64-encoded JSON string, and this content should be generated by a Google-provided library. I recommend referring to the guide on session_attributes for further details. 

Additionally, for more comprehensive information and guidance on capturing session attributes, please refer to the help center article About session_attributes.

Thanks,
 

Google Ads API Team

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[2025-11-05 07:04:46Z GMT] This message is in relation to case "ref:!00D1U01174p.!500Ht01vShVj:ref" (ADR-00338498)