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tab-requirements.md

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title Requirements for Building Tabs
description Learn about the permissions, compatibility, and other prerequisites, and tools required to build a Microsoft Teams personal, channel, or group tab.
ms.localizationpriority high
ms.topic conceptual
ms.date 02/06/2025

Prerequisites

Ensure that you adhere to the following prerequisites while building your Teams personal and channel or group tab:

  • Enable discovery of your tab pages in an iFrame by utilizing X-Frame-Options and Content-Security-Policy HTTP response headers.

  • Ensure that all Teams app pages are hosted on HTTPS endpoints.

  • Set Content Security Policy headers to allow Teams and any other host applications of your app:

    [!INCLUDE CSP headers for multi-hub apps]

    [!INCLUDE ocdi-warning]

    [!NOTE] To host the other Teams or Microsoft 365 apps within your app, upgrade your app to a Microsoft 365 environment. If you manage the app running in the nested frame, you can update its code to initialize the SDK by specifying your domain. This allows your nested frame to act as a proxy to Teams.

  • For Internet Explorer 11 compatibility, set X-Content-Security-Policy. Alternately, set header X-Frame-Options: ALLOW-FROM https://teams.microsoft.com/. This header is deprecated but most browsers still accept it.

  • Sign-in pages don't render in iFrames as a safeguard against clickjacking. Your authentication logic needs to use a method other than redirect. For example, use token-based or cookie-based authentication.

    [!NOTE] It is recommended that you set the intended use for your cookies rather than rely on default browser behavior. For more information, see SameSite cookie attribute.

  • Browsers same-origin policy restriction prevents webpages from making requests to different domains than the served web page. So, you can redirect the configuration or content page to another domain or subdomain. Your cross-domain navigation logic needs to allow the Teams client to validate the origin against a static validDomains list in the app manifest when loading or communicating with the tab.

  • Style your tabs based on the Teams client's theme, design, and intent. Tabs work best when built to address a specific need and focus on a small set of tasks or a subset of data that is relevant to the tab's channel location.

  • Within your content page, add a reference to Microsoft Teams JavaScript client library using script tags. After your page loads, make a call to app.initialize(), or else your page isn't displayed.

  • For authentication to work on mobile clients, you must upgrade to TeamsJS version 1.4.1 or later.

  • If you choose to have your channel or group tab to appear on Teams mobile client, the setConfig() configuration must have a value for the websiteUrl property.

  • Microsoft Teams tab doesn't support the ability to load intranet websites that use self-signed certificates.

[!INCLUDE sdk-include]

Tools to build tabs

  Install For using...
Required    
  Node.js Back-end JavaScript runtime environment. Use the latest v16 LTS release.
  Microsoft Edge (recommended) or Google Chrome A browser with developer tools.
  Visual Studio Code JavaScript, TypeScript, or SharePoint Framework (SPFx) build environments.
  Visual Studio 2022, ASP.NET and web development workload .NET. You can install the free community edition of Visual Studio 2022.
  Git Git to use the sample apps repo from GitHub.
  Microsoft Teams Microsoft Teams to collaborate with everyone you work with through apps for chat, meetings, call - all in one place.
  ngrok Ngrok is a reverse proxy software tool. Ngrok creates a tunnel to your locally running web server's publicly available HTTPS endpoints. Your server's web endpoints are available during the current session on your computer. When you shut down or put your device to sleep, the service is no longer available.
  Developer Portal for Teams Web-based portal to configure, manage, and publish your Teams app including to your organization or the Microsoft Teams Store.

Build your Teams tab

Now let's build your tab. But first select your choice of tab to build:

[!div class="nextstepaction"] Build a personal tab [!div class="nextstepaction"] Build a channel or group tab

See also