Prebid.Js Implementation: Best Practices for advertisers

Welcome to the world of Prebid.js, the leading open-source header bidding solution that empowers publishers to maximize ad revenue. As a newcomer, you’ll find the learning curve manageable if you’re familiar with JavaScript and digital advertising. Get ready to explore this essential tool in modern adtech.

The Basics

Prebid.js is a key component for publishers looking to implement header bidding on their webpages. It allows multiple demand partners to bid for ad inventory simultaneously, increasing competition and driving higher CPMs (cost per thousand impressions). Header bidding, as opposed to waterfall setups, ensures all advertisers have a fair chance to bid on inventory at the same time, potentially increasing the publisher’s yield. Prebid.js is a client-side JavaScript library that you include on your webpage, allowing you to integrate with a variety of demand sources. It is customizable and modular, which means you can choose from numerous bidder adapters to fit your specific business needs. The library connects to demand sources through these adapters, collects bids, runs an auction, and returns ad creatives to your ad server. Understanding how to set up and customize Prebid.js will enable you to leverage its full potential to maximize your programmatic revenue.

1. Install Prebid.js: Begin by downloading the Prebid.js package from the official GitHub repository or use the Prebid Builder tool to customize your build. Include the prebid.js file in your website’s header.
2. Set Up Ad Units: Define your ad units by specifying the ad sizes and placements on your webpage. Each ad unit will have a unique code that you will use later in the setup process.
3. Configure Bidder Adapters: Choose and configure bidder adapters corresponding to the demand partners you want to work with. Each adapter requires specific parameters, such as publisher ID, to function properly.
4. Initialize the Prebid.js Library: Write JavaScript to initialize the Prebid.js library, using the defined ad units and bidder configurations. This step links your setup to the demand partners.
5. Request Bids: Use the Prebid.js API to request bids. This involves calling the pbjs.requestBids function, which collects all bids from the configured partners.
6. Render Winning Ad: After the auction, the highest bid is determined. Use the ad server, such as Google Ad Manager, to render the winning ad on your webpage using the pbjs.setTargetingForGPTAsync function.

Terms You’ll Hear

Header Bidding	A programmatic technique allowing multiple demand sources to bid on inventory concurrently.
Bidder Adapter	A module in Prebid.js that connects to a specific demand partner to facilitate bid requests.
CPM	Cost Per Mille, or the cost per thousand ad impressions. A standard metric in advertising.
Ad Unit	A defined space on a webpage where ads are displayed, often characterized by size and placement.
Yield	The total revenue generated from ad inventory, often maximized through competitive bidding.
Auction	The process Prebid.js uses to compare all received bids and determine the winner.

Where to Go From Here

Once you’ve mastered the basics of Prebid.js implementation, it’s time to focus on optimizing and managing your header bidding setup. Consider exploring additional bidder adapters to increase demand, experiment with different price floors to optimize CPM, and analyze performance data to refine your strategy. Monitoring the latest updates and community discussions on Prebid.js will keep you informed about new features and best practices. Additionally, consider advanced setups like server-side bidding or hybrid models for further performance enhancements.