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Build message extension

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A message extension allows the users to interact with your web service through buttons and forms in the Microsoft Teams client. They can search or initiate actions in an external system from the compose message area, the command box, or directly from a message. You can send back the results of that interaction to the Teams client in the form of a richly formatted card.

Screenshot shows you the conceptual message extension in Teams client.

In this tutorial, you'll learn to build a search-based message extension app, and the app allows users to search npm packages from the Node Package Manager (npm) directory.

Get familiarized with search based message extension app in one of the following ways:

  • GitHub Codespaces: The codespace instance allows you to experience a Teams app instantaneously. It opens Visual Studio Code (VS Code), where the Teams Toolkit extension, the app source code, and all the dependencies are pre-packaged for you.
  • Step-by-step guide: Allows you to set up your development environment and build a Teams app from start.

Before you create your codespace, ensure that you have the following prerequisites:

Tip

GitHub Codespaces offers free plan up to a fixed amount of usage per month. If you need to free up more space, go to github.com/codespaces and delete the codespaces that you no longer need.

To create a search-based message extension app with GitHub Codespaces, follow these steps:

  1. Select the following button to open GitHub Codespaces.

    Open message extension in GitHub Codespaces

    You might be asked to sign in to GitHub account if you haven't already.

  2. Select Create new codespace.

    Screenshot shows you the GitHub page to create a codespace for message extension.

    The Setting up your codespace page appears.

    Screenshot shows you the codespace building your message extension.

    Teams Toolkit prepares the message extension for you and opens it in VS Code in the browser. The Teams Toolkit icon appears in the activity bar of VS Code.

  3. Select Sign in to your Microsoft 365 and Sign in to Azure to sign in with your Microsoft 365 account.

    Screenshot shows you the Teams Toolkit window in browser to sign in.

    Note

    When you build your app, GitHub Codespaces loads it to the Teams client in a new tab. If your browser blocks pop-up tabs or windows, you'll need to allow pop-ups for your app to open.

  4. Select Preview your Teams App (F5) to build your message extension.

    Screenshot shows you the Teams Toolkit window in browser with your message extension.

    GitHub Codespaces builds your message extension app, loads it to Teams client, and opens in a separate browser tab.

    Your message extension app is uploaded to Teams.

  5. Once the app dialog appears in Teams, select Add to install your message extension in Teams.

    Screenshot shows you the message extension loaded in the Teams client.

    You've successfully created the search-based message extension and loaded in the Teams client.

    Screenshot shows your message extension loaded in the Teams client.

For more information on message extensions, see message extensions.

If a bot is what you are interested in, select the following:

Start building a bot

If you want to build basic tab app, select the following:

Build your basic tab app

Next step

Choose what suits you

See also

npm directory