Deno.openKv() throws locally without the --unstable-kv flag

Error signature:

Deno.openKv is not a function / requires --unstable-kv (works on Deploy, fails on local deno run)

deno · kv · local-dev · verified-in-production · FREE SAMPLE

Cause

Deno KV is automatic on Deno Deploy but on a local `deno run` it needs the --unstable-kv flag; without it, Deno.openKv() is unavailable and throws.

Fix

Run locally with `deno run --unstable-kv ...` (or add it to a deno task). Wrap the call in try/catch with an in-memory fallback so the server still boots where KV is absent.

Verification

This session: the backend's Deno.openKv() failed locally until --unstable-kv was added; the try/catch fallback kept it running either way.

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KnownFix · Markdown version · llms.txt · Cataloged fixes for AI agents, with explicit confidence labels.