---
title: "How to Use Svelte and Go to Build a Video Chat App"
description: "The tutorial builds a video chat application with a Svelte single-page frontend and Go REST API, using Twilio Video for room-based calls. Users enter a room name, the backend validates it, mints a Twilio Access Token with a VideoGrant, and the frontend uses that token to connect and attach local and remote video tracks. The backend loads credentials from .env.local, assigns each participant a random crypto/rand identity, enables CORS, and serves requests on port 8000; room names shorter than six characters receive a 400 response. The frontend uses Vite, the Twilio Video JavaScript SDK, and iziToast, while testing involves running both servers and joining the same room in two browser tabs. The completed app handles video communication without custom permission, real-time communication, or data-streaming code."
---

# How to Use Svelte and Go to Build a Video Chat App

[Twilio](https://yomu.fyi/company/twilio) · Donal Toomey · Aug 28, 2026

**Type:** Tutorial

## Summary

The tutorial builds a video chat application with a Svelte single-page frontend and Go REST API, using Twilio Video for room-based calls. Users enter a room name, the backend validates it, mints a Twilio Access Token with a VideoGrant, and the frontend uses that token to connect and attach local and remote video tracks. The backend loads credentials from .env.local, assigns each participant a random crypto/rand identity, enables CORS, and serves requests on port 8000; room names shorter than six characters receive a 400 response. The frontend uses Vite, the Twilio Video JavaScript SDK, and iziToast, while testing involves running both servers and joining the same room in two browser tabs. The completed app handles video communication without custom permission, real-time communication, or data-streaming code.

## Context

The post presents real-time video chat as an additional level of interaction beyond text chat and updates an older tutorial for current framework and library versions.

## Approach / What changed

Build a Go backend that loads Twilio credentials, validates room names, generates room-scoped access tokens, and serves a CORS-enabled API, then create a Svelte frontend with Vite and the Twilio Video JavaScript SDK to join rooms and attach video tracks.

## Takeaways

- The Go backend creates a Twilio Access Token with a VideoGrant scoped to the requested room and returns the signed JWT as JSON.
- Participant identities are generated as random 16-byte values using crypto/rand and encoded as hexadecimal strings.
- Testing uses two browser tabs joining the same room; each tab can display local and remote video after camera and microphone permissions are granted.

**Tags:** [Go](https://yomu.fyi/topic/go), [Svelte](https://yomu.fyi/topic/svelte), [Twilio](https://yomu.fyi/topic/twilio)

- Source: [Twilio](https://www.twilio.com/en-us/blog/developers/tutorials/product/build-video-chat-app-svelte-go)
- Source URL: https://www.twilio.com/en-us/blog/developers/tutorials/product/build-video-chat-app-svelte-go
- Ingested by Yomu: 2026-09-09T13:35:48.745Z

[Read original post](https://www.twilio.com/en-us/blog/developers/tutorials/product/build-video-chat-app-svelte-go)