preRequest

This hook is called before sending a request to the Telegram Bot API (allowing you to modify the parameters being sent).

Parameters

• method - API method name
• params - API method parameters

IMPORTANT

You must return the context from the hook handler!

Example

import { Bot } from "gramio";

const bot = new Bot(process.env.BOT_TOKEN as string).preRequest((context) => {
    if (context.method === "sendMessage") {
        context.params.text = "changed parameters";
    }

    return context;
});

bot.start();

Add hook only to specified API methods

bot.preRequest("sendMessage", (context) => {
    context.params.text = "modified text";

    return context;
});
// or array
bot.preRequest(["sendMessage", "sendPhoto"], (context) => {
    if (context.method === "sendMessage") {
        context.params.text = "modified text";
    } else {
        context.params.caption = "this is a photo caption from sendPhoto method";
    }

    return context;
});