ApplicationBuilder

This page describes ApplicationBuilder in zalo-bot-js, which is used to configure and create Application in builder style.

This is the right choice if you want to organize your bot in a handler-based style instead of a pure event listener with Bot.

Role

ApplicationBuilder helps you:

• place tokens
• set baseUrl if needed
• make Application complete with build()

For example

import "dotenv/config";
import { ApplicationBuilder } from "zalo-bot-js";

const app = new ApplicationBuilder()
  .token(process.env.ZALO_BOT_TOKEN!)
  .build();

Main functions

token(token: string): this

Set up bot token for application.

baseUrl(baseUrl: string): this

Set a custom baseUrl if you don't want to use the default.

build(): Application

Create instance Application.

If the token is not set, this function will throw an error.

When should you use it?

• you want to write a bot using CommandHandler and MessageHandler
• you want a structure close to a traditional bot framework
• You want to clearly separate the app configuration part and the update handling part

Next

• See Application to see how the app operates the handler.
• See CommandHandler to handle handler-based commands.

Last updated: April 5, 2026