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Research: A shot-scraper-style JSON API on Bun 1.4's new Bun.WebView Simon Willison’s Weblog Subscribe 20th August 2026 Research A shot-scraper-style JSON API on Bun 1.4's new Bun.WebView — A zero-dependency, roughly 150-line TypeScript service demonstrates that Bun 1.4’s experimental Bun.WebView can provide a shot-scraper-style JSON API for JavaScript evaluation and PNG/JPEG/WebP screenshots without Puppeteer or Playwright. It creates one browser tab per request, supporting concurrency while returning page results and errors as JSON through /javascript, /screenshot, and /healthz. Today saw the long awaited release of Bun 1.4, the first stable version since the infamous Rust rewrite a few months ago. Interestingly, the Rust rewrite was downplayed in the release notes, which introduced a bewildering array of new features and claimed 2,900 additional bug fixes: Bun 1.4 adds +1,517 tests from the Node.js test suite - our biggest jump in Node.js compatibility since Bun 1.0. Bun v1.4 also fixes over 2,900 issues. It reduces idle CPU usage by 5x, reduces memory usage by up to 35%, and starts 50% faster on Linux. It adds Bun.Image, Bun.WebView, Bun.markdown, Bun.cron(), Bun.Terminal, bun run --parallel, bun test --parallel, bun audit fix, bun dedupe, and bun prune. And it rewrites Bun from Zig to Rust. Of these the one that most caught my eye was Bun.WebView, which adds first class support for browser automation to Bun core using either macOS WebKit or control of a local Chromium process via the Chrome DevTools Protocol (CDP). I had Claude Code for web build a prototype of a web API providing the ability to load a web page and then execute JavaScript against it, inspired by my shot-scraper javascript CLI tool - partly to see how much RAM would be needed by such a service. Here's that TypeScript server implementation, which appears to need a 192MB-256MB container to run a full Chrome against complex web pages - tested using cgroups. Recent articles Conceptual integrity and counting lines of code - 19th August 2026 Qwen 3.8 27B is excellent, but it defaults to wildly overthinking things - 16th August 2026 Now we have a timeline of the OpenAI accidental attack against Hugging Face - 7th August 2026 This is a beat by Simon Willison, posted on 20th August 2026. browsers 107 javascript 761 ai 2,195 rust 113 typescript 17 generative-ai 1,944 llms 1,911 coding-agents 238 bun 8 Monthly briefing Sponsor me for $10/month and get a curated email digest of the month's most important LLM developments. Pay me to send you less! Sponsor & subscribe Disclosures Colophon © 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026