Header Bidding Library
Back to libraryCheck UserSync Flags After a CMP Update
Review userId and userSync config after a CMP update or consent rollout changes page behavior.
Why this workflow matters
Teams use Prebid User ID Inspector when they need to confirm whether user sync and identity settings still look aligned after a CMP or consent change. CMP changes often reveal identity assumptions that were previously hidden by stable consent behavior.
The search intent behind this topic is usually very specific: someone has a real debugging task in front of them and needs a practical workflow rather than a generic tool list. Prebid User ID Inspector is the anchor tool for this page because it addresses the core evidence needed to move the issue forward.
How to investigate it
Open Prebid User ID Inspector first and inspect the identity config, review sync and consent markers, and use that output to frame the next privacy and bidder checks. Supporting tools such as Prebid Config Inspector and Prebid Timeout Risk Analyzer help once the first clue is visible.
The goal is not just to get an answer on screen. The goal is to produce a clean explanation that can be shared with engineering, ad ops, or an external partner without re-running the entire investigation from scratch.
What good output looks like
A strong first pass makes the post-CMP identity state much easier to explain across engineering and privacy teams.
This is also where niche pages win SEO more often than broad phrases. People searching for this exact troubleshooting scenario want a focused answer tied to a real operational problem. A page like this converts that intent directly into a tool workflow instead of asking the reader to infer which utility to open.
Run the auction checks next
These tools help when the problem looks tied to config, timeout pressure, ad-unit setup, identity, or floors.
Prebid User ID Inspector
Inspect Prebid `userId` and `userSync` configuration to see which identity modules appear active, what storage types they use, whether consent markers are visible, and whether auction delay settings look aggressive. This gives teams a real first-pass identity and sync review that is specific to header bidding rather than generic privacy tooling.
Prebid Config Inspector
Inspect a Prebid `pbjs.setConfig` snippet and surface the auction settings that actually shape runtime behavior: bidder timeout, timeout buffer, consent modules, user sync, floors, S2S, and more. This tool is built for engineers and ad-ops teams who need a fast readout of whether a configuration is sane before they open devtools or live auction logs. Paste a real config block and get concrete findings instead of guessing which modules are active.
Prebid Timeout Risk Analyzer
Diagnose Prebid auction timeout risk from real config snippets, adUnits, and optional bidder timing notes. Instead of only guessing from fetched HTML, the tool inspects timeout settings, auction pressure, identity delay markers, and pasted bidder outcomes so teams get a more actionable first-pass readout of why bids may be missing the auction.
Keep moving through header bidding reviews
Use the next links when you need to move from one symptom into the wider auction picture without starting over.