How to Build a Secure ZEGO Token Generator with Supabase Edge Functions

Introduction

When building a live-streaming app, security is often an afterthought—until something goes wrong. If you are using ZEGOCLOUD for video calls, exposing your AppSecret in the frontend is a major security risk.

In this tutorial, I’ll show you how to build a secure Token Mint using Supabase Edge Functions. This ensures your secret keys stay on the server, while your app gets a safe, temporary token to join rooms.

Prerequisites

To follow along, you’ll need:

• A ZEGOCLOUD account.
• A Supabase project.
• The Supabase CLI installed on your machine.

Step 1: Create the Edge Function

Open your terminal in your project folder and run:

supabase functions new get-zego-token

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This creates a new folder: supabase/functions/get-zego-token/index.ts.

Step 2: The Token Generation Logic

We will use the zego-server-assistant library to generate a Token04. Paste the following code into your index.ts:

import { serve } from "https://deno.land/[email protected]/http/server.ts"
import { generateToken04 } from 'https://esm.sh/[email protected]'

const corsHeaders = {
  'Access-Control-Allow-Origin': '*',
  'Access-Control-Allow-Headers': 'authorization, x-client-info, apikey, content-type',
}

serve(async (req) => {
  if (req.method === 'OPTIONS') {
    return new Response('ok', { headers: corsHeaders })
  }

  try {
    const { userId, roomID } = await req.json()

    const appId = parseInt(Deno.env.get('ZEGO_APP_ID') || '0')
    const serverSecret = Deno.env.get('ZEGO_SERVER_SECRET') || ''

    const effectiveTimeInSeconds = 3600 // 1 hour
    const payload = ''

    const token = generateToken04(appId, userId, serverSecret, effectiveTimeInSeconds, payload)

    return new Response(
      JSON.stringify({ token }),
      { headers: { ...corsHeaders, 'Content-Type': 'application/json' } }
    )
  } catch (error) {
    return new Response(JSON.stringify({ error: error.message }), {
      headers: { ...corsHeaders, 'Content-Type': 'application/json' },
      status: 400,
    })
  }
})

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Step 3: Secure Your Secrets

Don’t hardcode your keys! Use the Supabase CLI to set your environment variables:

supabase secrets set ZEGO_APP_ID=your_app_id
supabase secrets set ZEGO_SERVER_SECRET=your_server_secret

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Then, deploy your function:

supabase functions deploy get-zego-token

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Conclusion

You now have a production-ready backend that keeps your ZEGOCLOUD credentials safe. By calling this function from your frontend, you can securely generate tokens on the fly.

I’m a developer currently building a Social Live-Streaming platform. If you found this helpful, follow me for more deep dives into real-time web tech!