Deno v0.27.0 — Release Notes & Engineering Impact

Source available — automated, not human-reviewed

Component: deno · Channel: stable. Automated analysis, not a compatibility certification. How this works.

Analysis updated: 2026-11-01.

Compatibility not verified — check source notes

📄 .MD

✨ Features 5 🔧 Bug Fixes 6

⚡ Executive Summary (TL;DR)

Deno v0.27.0. Source highlight: feat: Support utf8 in file_server (#3495)

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Who Does This Impact? (Role-Based Analysis)

💻 Software Engineers & Devs

Check the source notes against the package and APIs you use before upgrading.

📊 Product & Engineering Leads

Use the documented changes to assess relevance to your product; release frequency alone is not a quality measure.

⚙️ DevOps & Security

Verify the target version, runtime requirements and rollback procedure in the official documentation.

✨ New Features & Capabilities (5)

feat: Support utf8 in file_server (#3495)
feat: add help & switch to flags to file_server (#3489)
feat: fetch should support URL instance as input (#3496)
feat: replace Deno.homeDir with Deno.dir (#3491, #3518)
feat: show detailed version with --version (#3507)

🔧 Bug Fixes & Patches (6)

fix(installer): installs to the wrong directory on Windows (#3462)
fix(std/http): close connection on .respond() error (#3475)
fix(std/node): better error message for read perm in require() (#3502)
fix(timer): due/now Math.max instead of min (#3477)
fix: Improve empty test case error messages (#3514)
fix: Only swallow NotFound errors in std/fs/expandGlob() (#3479)

📄 View Raw Release Notes (Original Developer Log)

### Changes - feat: Support utf8 in file_server (#3495) - feat: add help & switch to flags to file_server (#3489) - feat: fetch should support URL instance as input (#3496) - feat: replace Deno.homeDir with Deno.dir (#3491, #3518) - feat: show detailed version with --version (#3507) - fix(installer): installs to the wrong directory on Windows (#3462) - fix(std/http): close connection on .respond() error (#3475) - fix(std/node): better error message for read perm in require() (#3502) - fix(timer): due/now Math.max instead of min (#3477) - fix: Improve empty test case error messages (#3514) - fix: Only swallow NotFound errors in std/fs/expandGlob() (#3479) - fix: decoding uri in file_server (#3187) - fix: file_server should get file and fileInfo concurrently (#3486) - fix: file_server swallowing permission errors (#3467) - fix: isolate tests silently failing (#3459) - fix: permission errors are swallowed in fs.exists, fs.emptyDir, fs.copy (#3493, #3501, #3504) - fix: plugin ops should change op count metrics (#3455) - fix: release assets not being executable (#3480) - upgrade: tokio 0.2 in deno_core_http_bench, take2 (#3435) - upgrade: upgrade subcommand links to v0.26.0 (#3492) ### Install / Upgrade **With Shell:** ```sh curl -fsSL https://deno.land/x/install/install.sh | sh -s v0.27.0 ``` **With PowerShell:** ```powershell iwr https://deno.land/x/install/install.ps1 -useb -outf install.ps1; .\install.ps1 v0.27.0 ```

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