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CityJS London 2027 is the London edition of the community-run CityJS conference series, presented on its official site as CityAI London and focused on building production AI applications with JavaScript. It targets software engineers, AI engineers, technical leads and product developers who work across the JavaScript and TypeScript ecosystem. The event takes place in person over three days, from 21 to 23 April 2027. The opening day pairs a block of workshops with a free evening meetup, the second day is dedicated to professional and free workshops, and the full conference day on 23 April is held at Kensington Town Hall. Venues for the first two days were still to be confirmed at the time of listing. The programme covers building and orchestrating AI agents, connecting models to tools and application data, evaluating and monitoring LLM-powered apps, AI-driven interfaces in modern frameworks, and securing and scaling these systems with Node.js. Tickets are offered at community prices. For frontend and Node.js developers, this JavaScript conference in London offers a hands-on route into AI engineering without leaving the language they already know.
CityJS London 2027 takes place April 21–23, 2027 in London, United Kingdom.
CityJS London 2027 is an in-person event.
Travel questions? See Good to know in the travel guide below.
Kensington Town Hall puts this one in west London rather than the tech corridors east of the City, and late April is arguably the best window of the British year: Hyde Park and Kensington Gardens are in blossom, daylight stretches past eight, and the weather is mild without being crowded-summer busy. Museum Row is a few minutes' walk from the venue, which makes the gap between talks and dinner unusually easy to fill on foot.
Six airports serve the city. Heathrow (LHR) is the most convenient for Kensington, roughly 45 minutes on the Piccadilly line, or faster via the Elizabeth line and a change. Gatwick (LGW), Stansted (STN) and Luton (LTN) all run express rail into central terminals. From Europe, Eurostar arrives at St Pancras International. Use a contactless card or phone to tap on the Tube; there is no need to buy paper tickets.
Skip the taxi queue — pre-book a fixed-price airport transfer with Welcome Pickups. Exploring beyond the city? compare rental cars on EconomyBookings.
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Tube platforms and tunnels now carry mobile coverage on most central lines, but roaming charges catch out visitors from outside the UK. An eSIM bought before arrival avoids that and keeps you online for transit apps and conference chat. Set up an eSIM with Airalo before you board and you're online the moment you land.
Victoria and Albert Museum. Ten minutes from the venue on foot and free to enter, the V&A is the deepest design and applied-arts collection in the country. Do not attempt all of it: pick two or three galleries, and use the garden courtyard as a break. Late openings on Friday evenings suit a post-conference visit better than a rushed lunchtime.
Kensington Gardens and the Serpentine. The park begins a few streets from the town hall and is at its best in late April, when the avenues are in leaf and the Serpentine is busy with rowing boats. A loop past the Albert Memorial and the Serpentine Galleries takes about an hour. It is the simplest way to reset between a morning and afternoon track.
Natural History Museum. The Waterhouse building on Cromwell Road is worth entering for the architecture alone, and entry is free. Arrive at opening or in the last two hours to avoid school groups, which dominate the middle of the day in term time. Ninety minutes covers the main hall and one wing at a comfortable pace.
Design Museum and Holland Park. A short walk west, the Design Museum sits on the edge of Holland Park in a converted 1960s building with a striking hyperbolic roof. Its permanent collection on everyday design objects is compact and free; temporary exhibitions are ticketed. Pair it with a walk through the park's Kyoto Garden, which is at its best in spring. Tickets on Go City →
Which London airport should I use for a conference in Kensington?
Heathrow is closest and best connected to west London, with a direct Piccadilly line ride or a faster Elizabeth line route with one change. Gatwick and Stansted work but add rail time across the centre.
Do I need to buy a travel card?
No. Tap in and out with a contactless bank card or phone on the Tube, buses and most rail in the city, and daily capping applies automatically. Buses do not accept cash.
What is the weather like in London in late April?
Mild and changeable, typically 9-16C, with a real chance of showers on any given day. A light waterproof layer is more useful than a heavy coat.
Travel notes written for CityJS London 2027 attendees. Links marked above are affiliate links — we may earn a commission at no cost to you. Verify schedules and opening hours on official websites before you travel.
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