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# Justice for All! Diving into JsTz, a Native JavaScript Environment for Web3 Development


- **Date:** Friday, Jul 11, 2025
- **Time:** 11:00–11:30 (30 min)
- **Room:** Stage 5
- **Event:** World Congress 2025
- **Tags:** blockchain, performance, scalability, web3

## Recording

[Watch recording](https://www.wearedevelopers.com/videos/1586-justice-for-all-diving-into-jstz-a-native-javascript-environment-for-web3-development)

## Description

In this session, we’ll explore how Jstz allows JavaScript developers to build on Tezos Smart Rollups using the language, tools, and libraries they already know. By offering a native JavaScript runtime that supports standard APIs and leverages the npm ecosystem, Jstz removes the usual barriers that come with blockchain development. We’ll walk through the developer journey — from writing your first lines of code to integrating existing JavaScript libraries — and show how familiar workflows can now extend into the decentralised space with minimal friction.

## Speaker

### [Arthur Breitman](https://www.wearedevelopers.com/@arthur-breitman)

Co-founder of Tezos


## Related talks at this congress

- [End-to-End TypeScript: Completing the Modern Development Stack](https://www.wearedevelopers.com/events/world-congress-2025/sessions/759-end-to-end) — Marco Podien
- [Demystifying Crypto & Web3: A Technical Journey Through 15 Years of Innovation](https://www.wearedevelopers.com/events/world-congress-2025/sessions/842-demystifying-crypto) — Ed Marquez
- [Developer Joy with Quarkus](https://www.wearedevelopers.com/events/world-congress-2025/sessions/498-developer-joy-with) — Daniel Oh
- [If You Know TypeScript, You Know Blockchain: Learn How to Create a TypeScript Smart Contract](https://www.wearedevelopers.com/events/world-congress-2025/sessions/571-if-you-know) — Gabriel Kuettel