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Bun
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Bun
@bunjavascript
Bun is a fast, all-in-one toolkit for installing, bundling, running and testing JavaScript & TypeScript. To install: `npm i -g bun`
bun.com
Joined July 2022
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  • Pinned
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    Bun
    @bunjavascript
    Dec 2, 2025
    Bun is joining Anthropic!
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    Bun is joining Anthropic
    From bun.com
  • user avatar
    Bun
    @bunjavascript
    Aug 10
    In the next version of Bun `Bun.YAML.parse` supports cyclic anchors & aliases
    In the next version of Bun
▎
▎ Bun.YAML.parse supports cyclic anchors & aliases
▎
▎ tweet: &tweet
▎   text: |
▎     In the next version of Bun
▎
▎     Bun.YAML.parse supports cyclic anchors & aliases
▎   quote_tweet: *tweet
▎ const { tweet } = Bun.YAML.parse(src)
▎ tweet.quote_tweet.quote_tweet.quote_tweet.text
▎ // "In the next version of Bun\n\nBun.YAML.parse supports cyclic anchors & aliases\n"
  • user avatar
    Bun
    @bunjavascript
    Aug 8
    In the next version of Bun `Bun.XML.parse` is a SIMD-accelerated XML parser builtin to Bun
    XML parsing
S3 ListObjects response, 231 KB. Lower is better.
19×
faster than fast-xml-parser
Bun.XML.parse
1.3 ms
txml
4.8 ms
fast-xml-parser
24.8 ms
@xmldom/xmldom
33.6 ms
  • user avatar
    Bun
    @bunjavascript
    Aug 7
    In the last 16 days, an additional +473 new tests from Node.js' test suite pass in Bun v1.4
    Image
    Line chart titled "Bun's Node.js test suite progress", subtitled "Official Node.js test suite files run on every commit". The line starts at 1,378 test files at Bun v1.2.0 (January 2025), climbs through the 1.2 series to 2,250 at v1.3.14, holds flat across the 1.3 releases, then spikes to 3,188 files on main today (July 2026). A dashed target line at 3,693 reads "The bar to ship Bun v1.4: 3,693", with "505 to go" marking the gap between main and the target.
    user avatar
    Bun
    @bunjavascript
    Jul 22
    Bun v1.4 will be our biggest jump in Node.js compatibility since Bun v1.0
  • user avatar
    Bun
    @bunjavascript
    Aug 2
    In the next version of Bun We fixed a GC retention cycle that made Next.js App Router SSR leak memory when a page called fetch()
    Next.js 16 · App Router · next start. The SSR memory leak is gone in Bun v1.4.” Subtitle: “4,000 server-rendered pages: Bun v1.4 settles at 238 MB, under Node’s 410 MB. Bun v1.3.14 climbed to 1,983 MB and kept going.” A line chart of server memory (RSS) against requests served, 0 to 4,000, then a dashed tail to the value after 5 seconds idle. Bun v1.3.14 rises steadily to a 1,983 MB peak and settles at 1,901 MB; Node v26.5 flattens around 400 MB and settles at 410 MB; Bun v1.4 stays flat near 300–350 MB and settles at 238 MB. Footer: stock create-next-app (Next 16.2.3, React 19.2) with the bug report’s page — a React.cache-wrapped fetch(…, { cache: “no-store” }) in a dynamic route; 4,000 unique URLs at 50 concurrent; server RSS sampled from /proc every 200 requests; product API is a separate Node process; Linux x64; bun 1.4.0-canary f91d5c95c, bun 1.3.14, node 26.5.0.

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