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CityJS London is the flagship United Kingdom edition of the CityJS conference series and pairs the JavaScript programme with the organisers' CityAI strand. The 2027 event runs across three days at several venues in central London: an opening meetup hosted at Tessl HQ on Pentonville Road, workshop sessions hosted at Just Eat, and the main single-track conference day at Kensington Town Hall. Content covers the modern JavaScript and TypeScript ecosystem alongside the application of artificial intelligence to web development, spanning frameworks, tooling, architecture and developer experience. The distributed venue model gives the event a different character each day, moving from informal community meetup through hands-on instruction to a full conference format. London's density of technology companies gives the attendee mix a strong professional core of working engineers and technical leads. Workshops are limited in size and instructor led. For developers based in or travelling to the United Kingdom, this London JavaScript conference is among the most established annual fixtures in the local web development calendar.
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