Name: JSNation 2025
Start: 2025-06-12T11:00:00.000Z
End: 2025-06-16T19:00:00.000Z

A behind-the-scenes look at running the "State of" series of developer surveys (State of JS, CSS, etc.) as well as lessons learned and upcoming trends.

The State of the Web

Sacha Greif

Chrome Built-in AI APIs

Thomas Steiner

IPFS is a peer-to-peer network distributing for content addressed data and can be thought of as a distributed CDN. Yet, given its evolutionary trajectory IPFS is often misunderstood. In this talk, you’ll learn about current state of IPFS with a focus on integration with the web platform using HTTP(S), how it enables local-first distribution of web apps, and real applications for you as a web developer.

Demystifying IPFS: A Web Developer's Guide to Content Distribution

Daniel Norman

Modern JavaScript bundlers are architectural marvels that transform complex codebases into optimized production assets. This technical deep dive deconstructs how bundlers like Vite, webpack, or Rollup work under the hood, revealing the engineering that powers our build tools. We will journey through the bundling pipeline, starting from the understanding of the AST, parsing and static analysis for dependency resolution, some core optimizations like tree-shaking and code spitting, closing with some advanced concepts like HMR.

Bundlers: A Deep Dive into Modern JavaScript Build Tools

Edoardo Dusi

Dive into the environmental impact of the web through key insights from the HTTP Archive Almanac 2024. Discover shocking statistics about web sustainability, from massive page weights to unused code, and learn practical, immediate solutions to reduce your website's carbon footprint. This talk combines hard data with actionable strategies to make the web greener

Web Almanac 2024: Is the Web Sustainable? 

Burak Güneli

Ever used an app that crashed and thought, "Why can’t this just work?" For users, it’s frustrating. For businesses, it’s expensive. As JavaScript developers, we’re stuck in the middle - juggling frontend tweaks, backend performance, and monitoring tools to figure out what went wrong. That’s where observability comes in because understanding your code is like going to the gym. No shortcuts, no pills. You gotta put in the work to put on the muscle.  It’s not just some SRE buzzword anymore but a must-have for developers. Observability helps you spot issues, understand system behavior, and fix problems faster. And with OpenTelemetry, you get an open-source framework to manage logs, traces, and metrics without vendor lock-in. In this session, you’ll learn, all things observability, optimize both frontend and backend, and integrate OpenTelemetry to gain insights into your system. Moreover, you'll also learn how to practically integrate OpenTelemetry into your JavaScript apps, to create spans, track activities, name them effectively. The result? Fewer headaches, better performance, and apps that not just works but you completely understands.

When JavaScript Meets OpenTelemetry: It's Observability O'Clock

Yash Verma

Explore a world of hardware the likes of which you've never seen before! This presentation will contain live demos using both local robots and those in production from across the country. While the technology being used is advanced, the approach is accessible to anyone whose used JavaScript before.The talk covers the architecture of WebRTC as a stack of technologies for enabling peer-to-peer communication, as well as how it can be leveraged for interacting with embedded hardware and robotics from the browser, all using JavaScript APIs. My goal is to make programming devices more accessible to web developers and demonstrate a practical solution for taking hobby projects from your desk to production.

Real-Time Robot Control From the Browser With WebRTC

Nick Hehr

Svelte 5 introduced runes which use signals under the hood. While signals are very cool and unlock a ton of composability possibilities they have their own gotchas... let's explore them while creating a reactive signal based system from scratch to really understand them from the base!

Surprise! Svelte Secretly Sending Signals

Paolo Ricciuti

In October 2024, a language evolution proposal was submitted to the TC39 Javascript Committee meeting. In it, a new vision for JS as a whole is shown, one in which the language is seemingly split in two - a core ""JS0"" and an extended ""JSSugar"". What is this about, why did it come up at this point and what does it mean for us as JavaScript developers?In this short talk, we'll go over the proposal, exploring what it tries to accomplish, how and its potential pros and cons from a neutral, community-first perspective.

Divide and Conquer? - Exploring the 'JS0' and 'JSSugar' Proposal for JavaScript Evolution

Daniel Hervás

JS Nation

I’m attending JSNation – the main JavaScript conference of the year. You may join me there for free with 10k other JS engineers and 40+ great speakers. Just follow this badge. 

#javascript

Discover the future of the JavaScript development ecosystem and get connected to its stellar crowd! 

JSNation is the best place to learn about JavaScript – beside the main JS conf talks and panel discussion with high-profile specialists, be prepared for awesome MCs, in-depth workshops, a number of discussions & networking rooms, interactive entertainment, and engaging challenges for all participants.

JSNation 2025

FocusReactive

Hygraph

JetBrains

Storyblok

Sentry

Handsontable

Twilio

Bloomberg

Auth0 by Okta

Chainlink Labs

Codeium

Holepunch

A front-end component that combines data grid features with spreadsheet UX/UI. Professional support included. Works with React, Angular, Vue, and plain JavaScript.

Chainlink is the industry-standard Blockchain services platform

Storyblok is a CMS that works with all modern frameworks and platforms so you are completely free to choose the best option for your project. Kickstart a new CMS project with your favorite technology in a matter of minutes, and for free.

Storyblok is a Headless CMS that works with all modern frameworks and platforms so you are completely free to choose the best option for your project. Get started in a matter of minutes!

Get 14 days of Storyblok for Free

Sentry is essential for monitoring application code quality. From Error tracking to Performance monitoring, developers can see clearer, solve quicker, and learn continuously about their applications — from frontend to backend.&nbsp;

Twilio is a Cloud Communications Platform for developers. If you would like to send an SMS, program a phone call or send a Whatsapp message; you can do all of that and more with Twilio.

Get RCS on Twilio Messaging — no code changes required

With 10,000+ front-end apps + one of the world’s largest JavaScript/TypeScript codebases, @TechAtBloomberg is deeply committed to using JS/TS in building the world's most trusted information network for finance pros.

Enhance user authentication, simplify identity management, and provide a seamless login experience.

Level up your app's authentication with Auth0 by Okta

Codeium is the FREE, supercharged code copilot, helping devs write over 44% of their code and ship faster. Loved by hundreds of thousands with a near perfect 5 star rating.

Pear Runtime by Holepunch is an open-source combined Peer-to-Peer 🍐Runtime development &amp; deployment tool. Build, share &amp; extend zero-infrastructure P2P applications.

FocusReactive will help you architect, build, and lead technically advanced websites focusing on performance and scalability. Partners and <a href="https://focusreactive.com/next-js-expert-agency/" target="_blank" rel="noopener noreferrer">experts in Next.js/Vercel</a>, Storyblok, Sanity, Contentful, Shopify Hydrogen, and other Headless eCommerce platforms.Whether you seek <a href="https://focusreactive.com/headless-cms-expert-agency/" target="_blank" rel="noopener noreferrer">expert Headless CMS agency</a> services or an expert agency with deep experience with platforms like Headless <a href="https://focusreactive.com/react-cms/" target="_blank" rel="noopener noreferrer">React CMS</a> &amp; <a href="https://focusreactive.com/nextjs-cms/" target="_blank" rel="noopener noreferrer">NextJS CMS</a>, FocusReactive is the one to help you scale.

As a special perk, we're offering a complimentary&nbsp;<a href="https://focusreactive.com/nextjs-performance-audit/" target="_blank" rel="noopener noreferrer">NextJS audit</a> designed to pinpoint areas for optimization, improve performance, and ensure you're following the best practices for SEO and security.&nbsp; Our expert team will closely examine your implementation, provide actionable insights, and help you leverage the full power of NextJS.

JSNation 2025

The main JavaScript conference of the year