diff --git a/.npmrc b/.npmrc
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+# The Nostrify stack depends on packages published to JSR (the Deno registry),
+# exposed to npm under the `@jsr/*` scope (e.g. @jsr/std__encoding). npm must be
+# told these come from JSR's npm-compatible registry, otherwise it looks them up
+# on registry.npmjs.org and fails with a 404.
+@jsr:registry=https://npm.jsr.io
+
+# This project has a couple of long-standing benign peer-range lags (e.g.
+# react-day-picker@8 lists date-fns 2/3 as a peer while we use date-fns 4).
+# legacy-peer-deps lets `npm install` resolve like the build environment does,
+# instead of hard-failing on ERESOLVE.
+legacy-peer-deps=true