Facebook MessenJS

Facebook MessenJS is an API wrapper for Facebook Messenger inspired by discord.js. This library allows you to interact with Facebook Messenger's API. The bot was programmed with an object-oriented approach so that people can program their Facebook Messenger chatbots with ease.

Installation

npm i facebook-messenjs

Example Usage

Create a simple quick example bot:

const { Client } = require('facebook-messenjs');

const bot = new Client({
    pageToken: "PAGE_TOKEN_FROM_FACEBOOK",
    verifyToken: "YOUR_VERIFY_TOKEN",
    appID: "APP_ID_FROM_FACEBOOK"
});

// Allows Facebook to know that you set the URL of the bot properly
bot.on('webhookVerify', verification => {
    if (verification.success) {
        console.log("Webhook verified with Facebook successfully!");
    } else {
        console.log("Webhook verified with Facebook failed! ;-;");
    }
});

// Processes messages from people who message the Facebook page
bot.on("messages", message => {
    message.sender.send("Hi!");
});

// Turns on the bot at port 5566
bot.listen(5566, () => {
    console.log(`Facebook Messenger chatbot listening at http://localhost:${bot.port}`);
});

Create text quick replies:

const { Client, TextQuickReply } = require('facebook-messenjs');

bot.on('messages', message => {
    if (!message.payload) { // Checks if the message has a payload
        message.sender.send("Hi! What is your favorite color?", [
            new QuickReplies.Text("Red", "RESPONSE_RED"),
            new QuickReplies.Text("Yellow", "RESPONSE_YELLOW"),
            new QuickReplies.Text("Others", "RESPONSE_OTHERS")
        ]);
    } else {
        // Responds appropriately to payloads
        switch (message.payload) {
            case "RESPONSE_RED":
                message.sender.send("Red? Me too!");
            break;
            case "RESPONSE_OTHERS":
                message.sender.send("Yellow? That's a nice color!");
            break;
            default:
                message.sender.send("I like that color too.");
        }
    }
});

Set persistent menu:

const { Client, PostbackButton } = require('facebook-messenjs');

bot.on('messagingPostback', postback => {
    if (postback.payload === "GET_STARTED") {
        postback.sender.setPersistentMenu([
            new PostbackButton("Button 1", "PAYLOAD_ONE"),
            new PostbackButton("Button 2", "PAYLOAD_TWO")
        ]);
    }
});

Send pictures:

const { Client, BaseAttachment } = require('facebook-messenjs');

const picture = new BaseAttachment(bot, "image", {
    content: "./picture.png",
    reusable: true
});

bot.on("messages", message => {
    message.sender.send(picture);
});