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Reading IAB TCF Consent in JavaScript: __tcfapi, TC Strings and the TCF 2.3 Rule

This story is from 2026-10-02. It is preserved in the archive; the latest stories are on the live feed.

TL;DR The IAB TCF is the standard for passing ad consent from a cookie banner to ad vendors. Your CMP exposes __tcfapi on the page. Listen for events instead of polling. From 1 March 2026, new TC strings need the Disclosed Vendors segment (TCF 2.3). TCF 2.4's deadline for websites is 23 October 202…

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  1. 2026-10-02 12:42 · DEV Community — AI
    Reading IAB TCF Consent in JavaScript: __tcfapi, TC Strings and the TCF 2.3 Rule

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