PodRocket

LogRocket

Podcast

Episodes

Listen, download, subscribe

Apple Podcasts

Spotify

The browser APIs you're shipping libraries to replace with Kilian Valkhof

4/2/2026 • 38 min

Most developers reach for date-fns or Moment.js without realizing the browser already ships a powerful string formatting library called the JavaScript Intl API. Killian Valkhof, creator of Polypane, walks through how locale-aware date formatting, currency formatting, the Segmenter API, and the Collator API can replace heavy npm dependencies, with support for over 7,000 locales baked right into every evergreen browser since 2017. Links Resources INTL: The best browser API you’re not using | Kilian Valkhof: https://www.youtube.com/watch?v=mhzJ1UFlRjw We want to hear from you! How did you find us? Did you see us on Twitter? In a newsletter? Or maybe we were recommended by a friend? Fill out our listener survey! https://t.co/oKVAEXipxu Let us know by sending an email to our producer, Elizabeth, at elizabeth.becz@logrocket.com, or tweet at us at PodRocketPod. Check out our newsletter! https://blog.logrocket.com/the-replay-newsletter/ Follow us. Get free stickers. Follow us on Apple Podcasts, fill out this form, and we’ll send you free PodRocket stickers! What does LogRocket do? LogRocket provides AI-first session replay and analytics that surfaces the UX and technical issues impacting user experiences. Start understanding where your users are struggling by trying it for free at LogRocket.com. Try LogRocket for free today. Chapters 00:00 Introduction — Browser APIs & the Intl API 01:00 Why Developers Overlook Internationalization 02:30 What the Intl API Actually Is (It's a Formatting Library) 04:00 7,000 Locales Built Into Every Browser 06:00 What Intl Does NOT Do — It's String Output Only 07:00 date-fns, Moment.js, Luxon, and Numeral.js Compared 09:00 Why the Segmented Rollout Slowed Adoption 11:00 Currency Formatting and Locale Trust Signals 13:00 The Worst Under-Used API in the Browser 16:00 How Browser Specs Have Evolved Since HTML5 18:30 Dialogue, Popover, Anchor Positioning — New Primitives 23:00 The Top Layer and Z-Index Problems Solved 25:00 WebGPU, WASM, and Native API Trends 27:30 The Easiest Way to Start Using Intl Today 31:00 Collator, Segmenter, and List Format APIs 32:00 Wrap-Up and Where to Find Killian's Full Talk Special Guest: Kilian Valkhof.

PodRocket RSS Feed

Share: Twitter • Facebook