4.22.1 • Public • Published


Yeoman generator for Bot Framework v4. Will let you quickly set up a conversational AI bot using core AI capabilities.


generator-botbuilder will help you build new conversational AI bots using the Bot Framework v4.


The generator supports three different template options. The table below can help guide which template is right for you.

Template Description
Echo Bot A good template if you want a little more than "Hello World!", but not much more. This template handles the very basics of sending messages to a bot, and having the bot process the messages by repeating them back to the user. This template produces a bot that simply "echoes" back to the user anything the user says to the bot.
Core Bot Our most advanced template, the Core template provides 6 core features every bot is likely to have. This template covers the core features of a Conversational-AI bot using LUIS. See the Core Bot Features table below for more details.
Empty Bot A good template if you are familiar with Bot Framework v4, and simply want a basic skeleton project. Also a good option if you want to take sample code from the documentation and paste it into a minimal bot in order to learn.

How to Choose a Template

Template When This Template is a Good Choice
Echo Bot You are new to Bot Framework v4 and want a working bot with minimal features.
Core Bot You understand some of the core concepts of Bot Framework v4 and are beyond the concepts introduced in the Echo Bot template. You're familiar with or are ready to learn concepts such as language understanding using LUIS, managing multi-turn conversations with Dialogs, handling user initiated Dialog interruptions, and using Adaptive Cards to welcome your users.
Empty Bot You are a seasoned Bot Framework v4 developer. You've built bots before, and want the minimum skeleton of a bot.

Template Overview

Echo Bot Template

The Echo Bot template is slightly more than the a classic "Hello World!" example, but not by much. This template shows the basic structure of a bot, how a bot recieves messages from a user, and how a bot sends messages to a user. The bot will "echo" back to the user, what the user says to the bot. It is a good choice for first time, new to Bot Framework v4 developers.

Core Bot Template

The Core Bot template consists of set of core features most every bot is likely to have. Building off of the core message processing features found in the Echo Bot template, this template adds a number of more sophisticated features. The table below lists these features and provides links to additional documentation.

Core Bot Features Description
Send and receive messages The primary way your bot will communicate with users, and likewise receive communication, is through message activities. Some messages may simply consist of plain text, while others may contain richer content such as cards or attachments.
Proactive messaging using Adaptive Cards The primary goal when creating any bot is to engage your user in a meaningful conversation. One of the best ways to achieve this goal is to ensure that from the moment a user first connects to your bot, they understand your bot’s main purpose and capabilities. We refer to this as "welcoming the user." The Core template uses an Adaptive Card to implement this behavior.
Language understanding using LUIS The ability to understand what your user means conversationally and contextually can be a difficult task, but can provide your bot a more natural conversation feel. Language Understanding, called LUIS, enables you to do just that so that your bot can recognize the intent of user messages, allow for more natural language from your user, and better direct the conversation flow.
Multi-turn conversation support using Dialogs The ability to manage conversations is an important part of the bot/user interation. Bot Framework introduces the concept of a Dialog to handle this conversational pattern. Dialog objects process inbound Activities and generate outbound responses. The business logic of the bot runs either directly or indirectly within Dialog classes.
Managing conversation state A key to good bot design is to track the context of a conversation, so that your bot remembers things like the answers to previous questions.
How to handle user-initiated interruptions While you may think that your users will follow your defined conversation flow step by step, chances are good that they will change their minds or ask a question in the middle of the process instead of answering the question. Handling interruptions means making sure your bot is prepared to handle situations like this.
How to unit test a bot Optionally, the Core Bot template can generate corresponding unit tests that shows how to use the testing framework introduced in Bot Framework version 4.5. Selecting this option provides a complete set of units tests for Core Bot. It shows how to write unit tests to test the various features of Core Bot. To add the Core Bot unit tests, run the generator and answer yes when prompted. See below for an example of how to do this from the command line.

Empty Bot Template

The Empty Bot template is the minimal skeleton code for a bot. It provides a stub onTurn handler but does not perform any actions. If you are experienced writing bots with Bot Framework v4 and want the minimum scaffolding, the Empty template is for you.

Features by Template

Feature Empty Bot Echo Bot Core Bot
Generate code in JavaScript or TypesScript X X X
Support local development and testing using the Bot Framework Emulator v4 X X X
Core bot message processing X X
Deploy your bot to Microsoft Azure X X
Welcome new users using Adaptive Card technology X
Support AI-based greetings using LUIS X
Use Dialogs to manage more in-depth conversations X
Manage conversation state X
Handle user interruptions X
Unit test a bot using Bot Framework Testing framework (optional) X


  1. Install Yeoman using npm (we assume you have pre-installed node.js).

    # Make sure both are installed globally
    npm install -g yo
  2. Install generator-botbuilder by typing the following in your console:

    # Make sure both are installed globally
    npm install -g generator-botbuilder
  3. Verify that Yeoman and generator-botbuilder have been installed correctly by typing the following into your console:

    yo botbuilder --help


Creating a New Bot Project

When the generator is launched, it will prompt for the information required to create a new bot.

# Run the generator in interactive mode
yo botbuilder

Generator Command Line Options

The generator supports a number of command line options that can be used to change the generator's default options or to pre-seed a prompt.

Command line Option Description
--help, -h List help text for all supported command-line options
--botname, -N The name given to the bot project
--description, -D A brief bit of text that describes the purpose of the bot
--language, -L The programming language for the project. Options are JavaScript or TypeScript.
--template, -T The template used to generate the project. Options are empty, echo, or core. See for additional information regarding the different template option and their functional differences.
--addtests A Core Bot Template Only Feature. The generator will add unit tests to the Core Bot generated bot. This option is not available to other templates at this time. To learn more about the test framework released with Bot Framework v4.5, see How to unit test bots. This option is intended to enable automated bot generation for testing purposes.
--noprompt The generator will not prompt for confirmation before creating a new bot. Any requirement options not passed on the command line will use a reasonable default value. This option is intended to enable automated bot generation for testing purposes.

Example Using Command Line Options

This example shows how to pass command line options to the generator, setting the default language to TypeScript and the default template to Core.

# Run the generator defaulting the language to TypeScript and the template to core
yo botbuilder --L "TypeScript" --T "core"

Generating a Bot Using --noprompt

The generator can be run in --noprompt mode, which can be used for automated bot creation. When run in --noprompt mode, the generator can be configured using command line options as documented above. If a command line option is ommitted a reasonable default will be used. In addition, passing the --noprompt option will cause the generator to create a new bot project without prompting for confirmation before generating the bot.

Default Options

Command line Option Default Value
--botname, -N my-chat-bot
--description, -D "Demonstrate the core capabilities of the Microsoft Bot Framework"
--language, -L JavaScript
--template, -T echo
--addtests When specified, will cause the Core Bot template to add unit tests.

Examples Using --noprompt

This example shows how to run the generator in --noprompt mode, setting all required options on the command line.

# Run the generator, setting all command line options
yo botbuilder --noprompt -N "my-first-bot" -D "A bot that demonstrates core AI capabilities" -L "JavaScript" -T "Echo"

This example shows how to run the generator in --noprompt mode, using all the default command line options. The generator will create a bot project using all the default values specified in the Default Options table above.

# Run the generator using all default options
yo botbuilder --noprompt

This example shows how to run the generator in --noprompt mode, generating a TypeScript Core Bot with unit tests.

# Run the generator using all default options
yo botbuilder -N "my-core-bot-with-tests" -D "A core bot with tests in TypeScript" -L "TypeScript" -T "core" --addtests --noprompt

Running Your Bot

Running Your Bot Locally

To run your bot locally, type the following in your console:

# install modules
npm install
# run the bot
npm start

Interacting With Your Bot Using the Emulator

  • Launch Bot Framework Emulator
  • File -> Open Bot
  • Enter a Bot URL of http://localhost:3978/api/messages

Once the Emulator is connected, you can interact with and receive messages from your bot.

Developing Your Bot Locally

It's often easier to develop the capabilities of your bot locally, and to use the Microsoft Bot Framework Emulator to test your changes. When the generator generated your bot project it added a file watcher to the project. When run, the watcher which will cause nodejs to reload the bot whenever any of the bot's source files change. Causing nodejs to reload your bot under these circumstances will ensure you are always running the latest version of your bot. Enable the watch feature by typing the following in your console:

# From the directory that contains your bot
npm run watch

When you run the watch task, nodejs will reload your bot anytime a file in your project changes. When using the Emulator to interact with your bot, you will need to click the Emulator's 'Start Over' tab in order to force the Emulator to also reload the latest version of your bot.

Lint Compliant Code

The code generated by the botbuilder generator is lint compliant. Depending on whether the bot was generated using JavaScript or TypeScript, there is either a .eslint or .tslint file that contains the linting rules used to lint the generated code. To use lint as your develop your bot:

npm run lint

Testing Core Bots with Tests

Core Bot templates generated with unit tests can be tested using the following:

# launch mocha, run unit tests, report code coverage
npm test

Deploy Your Bot to Azure

After creating the bot and testing it locally, you can deploy it to Azure to make it accessible from anywhere. To learn how, see Deploy your bot to Azure for a complete set of deployment instructions.

If you are new to Microsoft Azure, please refer to Getting started with Azure for guidance on how to get started on Azure.

Optionally Using Development Builds

Development builds are based off of "work in progress" code. This means they may or may not be stable and may have incomplete documentation. These builds are better suited for more experienced users and developers, although everyone is welcome to give them a shot and provide feedback.

You can get the latest development builds of generator-botbuilder from the BotBuilder MyGet feed. To install the latest development build, follow the following steps:

# configure npm to pull from the developer builds registry
npm config set registry
# installing using npm
npm install -g generator-botbuilder
# reset npm to use the public registry
npm config set registry

Now when yo botbuilder is run, it will use the development build. To remove the development build, run the following:

# installing using npm
npm uninstall -g generator-botbuilder

Creating a Local Development Environment

To work on the template, evolve it, fix bugs in it, you need to create a local development environment. This setup process entails clone the repository, installing dependencies and creating a symlink that allows the local generated to be run by Yeoman. Here are the steps to create and use a local development environment for development:

# clone the repository
git clone
# change into the generator-botbuilder folder
cd BotBuilder-JS/generators/generator-botbuilder
# install the generators npm dependencies
npm install
# create a symlink to your local package folder
npm link

At this point you have everything setup to make changes to the sources. The steps that follow show how to run the changed generator using Yeoman, and when you're finished, deleting the symlink.

# run the local copy of the generator
yo botbuilder
# delete the symlink to your local package folder
npm unlink

Logging Issues and Providing Feedback

Issues and feedback about the botbuilder generator can be submitted through the project's GitHub Issues page.

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