Microsoft Power Platform Developer (PL-400) — Practice Questions and Mock Exam

The PL-400 certification validates skills in designing, developing, testing, and troubleshooting Microsoft Power Platform solutions using code. It covers custom connectors, plug-ins, PCF (PowerApps Component Framework) controls, Azure Functions integration, workflow extensions, Dataverse Web API development, and solution packaging for the Power Platform.

This certification is designed for professional developers who extend the Power Platform beyond low-code capabilities. Candidates should be proficient in JavaScript, C#, TypeScript, or .NET and have experience building custom components, server-side logic, and API integrations that enhance model-driven and canvas apps on the Power Platform.

Extending the platform dominates at 30–35%, more than double any other domain — Dataverse plug-ins, custom connectors, platform APIs, Azure Functions, and Power Automate cloud flows all sit here. The other five domains each hold a narrow 10–15% band: technical design, building solutions, Power Apps improvements, user-experience extension, and integrations.

The imbalance is deliberate: PL-400 is fundamentally a plug-in and API exam wearing a Power Platform label, and candidates who spend their prep time on PCF controls or canvas app improvements while treating Dataverse plug-ins and custom connectors as one topic among six will find that one topic is worth as much as the other five combined. ALM and solution deployment appear throughout the smaller domains rather than as a section of their own, so managed-versus-unmanaged solution behavior needs to be fluent, not memorized once.

The exam draws 40–60 questions from a mix of multiple-choice, multiple-select, drag-and-drop, and hot-area formats inside a 100-minute window. C# and JavaScript code snippets appear directly inside questions about plug-ins, PCF controls, and API integration, beyond conceptual descriptions of what they do. Solution lifecycle management and deployment strategy questions run alongside the coding scenarios rather than as a separate section.

The PL-400 pool covers every exam domain and keeps growing with new questions. A mock exam asks 50 questions in one sitting, on the same 100-minute clock as the real thing.

How long you'll need depends on how much hands-on experience you bring. The rest is set by the vendor: how the exam is delivered, how soon you can retake it, and how long the credential stays valid.

The exam runs through Pearson VUE, either online with a remote proctor or at an authorized testing center, and is offered in English, German, French, Spanish, Portuguese, Japanese, and Chinese. Certification holds for one year, and Microsoft opens a free renewal assessment on Learn starting six months before it expires.

Plug-in registration, execution-pipeline stages, and transaction management only make sense once you've registered one and watched it fail at the wrong stage — the exam expects that intuition, not a definition of what a plug-in is. PCF controls raise the same problem for component development: lifecycle methods and manifest configuration behave differently in practice than the documentation implies, and custom-connector authentication (OAuth2 versus API key) trips up candidates who've only used pre-built connectors. Managed and unmanaged solutions, solution layering, and Azure DevOps deployment pipelines matter as much as the code itself, and the Dataverse Web API's CRUD operations, FetchXML queries, and batch patterns are easy to underrate until a question asks for the exact request shape.