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A simple, choice-driven chatbot framework for your website written in less than 100 lines of vanilla JavaScript (and some CSS)
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docs Fix tpyos in example Nov 28, 2019
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peekobot.js Fix broken linking in conversations Nov 28, 2019


Peekobot is a simple, choice-driven chatbot framework for your website written in less than 100 lines of ES6 vanilla JavaScript (and some CSS).

There is an example bot you can see in the /docs folder.

There is also a CodePen you can tinker with.


  • Small, simple, zero dependencies (unless you need old browser compatibility)
  • Define your conversation as a simple JavaScript object
  • Choice/button driven conversations
  • Options to link to URLs as well as other parts of the conversation

Browser Compatibility

I use async/await and CSS custom properties, so, broadly speaking, Internet Explorer and Opera Mini are not supported.

You can use Babel or similar to bring IE11 compatibility to the JavaScript.

You can also manually inline the CSS custom properties if you want to.


To use Peekobot, you need to:

  1. Add Peekobot scripts and styles to your HTML
  2. Add Peekobot markup to your HTML
  3. Define your conversation

1. Add Peekobot scripts and styles to your HTML

Download the peekobot.js and peekobot.css files into your project.

You can do this by grabbing the raw code for these files from GitHub or by cloning the project.

Then add the Peekobot scripts and styles to your HTML.

These should go in the head:

    <!-- Peekobot custom properties (CSS variables) - set these! -->
        :root {
            --peekobot-height: 80vh;
            --peekobot-avatar: url();
    <!-- Peekobot styles -->
    <link rel="stylesheet" href="peekobot.css">

Note that you can change the height of the chatbot window here and define an "avatar" URL to be used in the chat by your chatbot. This should be small, square and fit within a circle shape. My CSS displays at 24px square, so a 48px x 48px image should be fine.

These should go at the bottom of your HTML to load the JavaScript:

    <script src="conversation.js"></script>
    <script src="peekobot.js"></script>

2. Add Peekobot markup to your HTML body

Add the Peekobot markup to your HTML body where you want the chatbot to appear:

    <div id="peekobot-container">
        <div id="peekobot"></div>

3. Define your conversation

The conversation definition should be placed in a JavaScript variable called chat. I define this in the conversation.js file. You can inline it if you want to.

The chat variable should be an object with numerical property names, and each property is an entry in the conversation.

A conversation entry should have:

  • A text property that is what the chatbot says at this point in the conversation
  • Either:
    • A next property, which defines the next chat entry by stating a numerical key of the chat object and is used when the chatbot needs to say several things in turn without input from the user OR
    • An options property that defines the choices a user can take. This is an array of option objects.

An options object should have:

  • a text property that is the label for the user's choice AND EITHER
  • a next property that defines the next chat entry by stating a numerical key of the chat object and is used when the user selects this option OR
  • a url property that defines a link for the user to be taken to

A simple example chat object is:

const chat = {
    1: {
        text: 'Good morning sir',
        next: 2
    2: {
        text: 'Would you like tea or coffee with your breakfast?',
        options: [
                text: 'Tea',
                next: 3
                text: 'Coffee',
                next: 4
    3: {
        text: 'Splendid - a fine drink if I do say so myself.'
    4: {
        text: 'As you wish, sir'


This is my first proper open source project. It's kinda neat, and it works, but it's probably not finished. My main concerns are

  • Accessibility: I've not really looked at accessibility of this code. It probably needs some work
  • Security - it's entirely possible that some script could hijack the bot's script code.

Let me know if you have ideas about how to fix these things by raising an issue.


I released this in a bit of a hurry and needed a name. It's a mash-up of:

  • picobot
  • peek-a-boo

and I mostly chose it becase all the other "small bot" names, such as picobot, nanobot, etc were taken. It kinda works.

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