Deno v1.13.0 — 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.

Breaking-change evidence from the source

- BREAKING(unstable): Rename Deno.WebSocketUpgrade::websocket to socket (#11542)

Read the original context ↗

Source flags breaking changes — review applicability

📄 .MD

✨ Features 6 🔧 Bug Fixes 6 ⚠️ Breaking & Deprecations 1

⚡ Executive Summary (TL;DR)

Deno v1.13.0. Source highlight: BREAKING(unstable): Rename Deno.WebSocketUpgrade::websocket to socket (#11542)

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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.

⚠️ Breaking Changes & Deprecations (1)

- BREAKING(unstable): Rename Deno.WebSocketUpgrade::websocket to socket (#11542)

✨ New Features & Capabilities (6)

feat: Add --unsafely-ignore-certificate-errors flag to disable SSL
feat: add experimental WebSocketStream API (#10365)
feat: FFI API replacing native plugins (#11152)
feat: stabilize Deno.serveHttp() (#11544)
feat: support AbortSignal in writeFile (#11568)
feat: support client certificates for connectTls (#11598)

🔧 Bug Fixes & Patches (6)

fix: support windows file specifiers with import maps (#11551)
fix: Type `Deno.errors.*` as subclasses of `Error` (#10702)
fix(doc): panic on invalid url (#11536)
fix(extensions/fetch): Add Origin header to outgoing requests for fetch
fix(extensions/websocket): allow any close code for server (#11614)
fix(lsp): do not output to stderr before exiting the process (#11562)

📄 View Raw Release Notes (Original Developer Log)

### 1.13.0 / 2021.08.10 - BREAKING(unstable): Rename Deno.WebSocketUpgrade::websocket to socket (#11542) - feat: Add --unsafely-ignore-certificate-errors flag to disable SSL verification (#11324) - feat: add experimental WebSocketStream API (#10365) - feat: FFI API replacing native plugins (#11152) - feat: stabilize Deno.serveHttp() (#11544) - feat: support AbortSignal in writeFile (#11568) - feat: support client certificates for connectTls (#11598) - feat: type check codeblocks in Markdown file with "deno test --doc" (#11421) - feat(extensions/crypto): implement importKey and exportKey for raw HMAC keys (#11367) - feat(extensions/crypto): implement verify() for HMAC (#11387) - feat(extensions/tls): Optionally support loading native certs (#11491) - feat(extensions/web): add structuredClone function (#11572) - feat(fmt): format top-level JSX elements/fragments with parens when multi-line (#11582) - feat(lsp): ability to set DENO_DIR via settings (#11527) - feat(lsp): implement refactoring code actions (#11555) - feat(lsp): support clients which do not support disabled code actions (#11612) - feat(repl): add --eval flag for evaluating code when the repl starts (#11590) - feat(repl): support exports in the REPL (#11592) - feat(runtime): allow URL for permissions (#11578) - feat(runtime): implement navigator.hardwareConcurrency (#11448) - feat(unstable): clean environmental variables for subprocess (#11571) - fix: support windows file specifiers with import maps (#11551) - fix: Type `Deno.errors.*` as subclasses of `Error` (#10702) - fix(doc): panic on invalid url (#11536) - fix(extensions/fetch): Add Origin header to outgoing requests for fetch (#11557) - fix(extensions/websocket): allow any close code for server (#11614) - fix(lsp): do not output to stderr before exiting the process (#11562) Release notes for std version 0.104.0: https://github.com/denoland/deno_std/releases/tag/0.104.0

← Older Version Deno v1.12.2 Newer Version → Deno v1.13.1