A curious software engineer based in Skopje, North Macedonia, solving engineering problems, building products people use, and sharing what I learn along the way.https://bfzli.comenhttps://bfzli.com/astro-hydration-mismatch-appears-when-server-and-client-render-different-text-contenthttps://bfzli.com/astro-hydration-mismatch-appears-when-server-and-client-render-different-text-contentAstro throws a hydration mismatch when a component renders different text on the server and in the browser.Mon, 02 Nov 2026 00:00:00 GMTastrohydrationssrclient-siderenderinghttps://bfzli.com/vite-throws-module-fs-has-been-externalized-for-browser-compatibility-when-browser-code-imports-node-built-inshttps://bfzli.com/vite-throws-module-fs-has-been-externalized-for-browser-compatibility-when-browser-code-imports-node-built-insExplain why Vite externalizes Node built-ins in browser bundles and how to keep server-only modules out of client code.Sun, 01 Nov 2026 00:00:00 GMTvitebrowser-bundlenode-builtinsssrrolluphttps://bfzli.com/cloudflare-workers-read-undefined-environment-bindings-because-wrangler-toml-does-not-declare-themhttps://bfzli.com/cloudflare-workers-read-undefined-environment-bindings-because-wrangler-toml-does-not-declare-themShow why a Worker sees missing secrets or vars at runtime and how to define bindings in `wrangler.toml` correctly.Sat, 31 Oct 2026 00:00:00 GMTcloudflare-workerswranglerenvbindingsdeploymenthttps://bfzli.com/nginx-sends-the-wrong-host-header-to-an-upstream-app-behind-a-reverse-proxyhttps://bfzli.com/nginx-sends-the-wrong-host-header-to-an-upstream-app-behind-a-reverse-proxyShow how Nginx rewrites Host and `X-Forwarded-*` headers and how to preserve the original domain upstream.Fri, 30 Oct 2026 00:00:00 GMTnginxreverse-proxyheadershostforwardedhttps://bfzli.com/remix-loses-session-cookies-on-a-cross-site-callback-because-samesite-blocks-the-cookiehttps://bfzli.com/remix-loses-session-cookies-on-a-cross-site-callback-because-samesite-blocks-the-cookieExplain why a Remix session cookie disappears on a third-party redirect and how to set cookie attributes correctly.Thu, 29 Oct 2026 00:00:00 GMTremixcookiessessionssame-siteauthhttps://bfzli.com/deno-fails-to-resolve-an-npm-package-imported-without-the-npm-prefixhttps://bfzli.com/deno-fails-to-resolve-an-npm-package-imported-without-the-npm-prefixShow why Deno treats bare npm specifiers differently and how to import packages with the right resolver rules.Wed, 28 Oct 2026 00:00:00 GMTdenonpmmodule-resolutionimport-mapshttps://bfzli.com/cloudflare-workers-reject-a-second-read-with-typeerror-body-used-already-after-request-texthttps://bfzli.com/cloudflare-workers-reject-a-second-read-with-typeerror-body-used-already-after-request-textFix Workers handlers that consume a request body twice and learn when to clone or cache the parsed data.Tue, 27 Oct 2026 00:00:00 GMTcloudflare-workersfetchrequest-bodyjavascriptedgehttps://bfzli.com/eslint-fails-with-parsing-error-cannot-read-file-tsconfig-json-after-switching-to-flat-confighttps://bfzli.com/eslint-fails-with-parsing-error-cannot-read-file-tsconfig-json-after-switching-to-flat-configExplain why ESLint can no longer find the TypeScript project file and how to point the parser at the right path.Mon, 26 Oct 2026 00:00:00 GMTeslinttypescriptflat-configparserlinthttps://bfzli.com/vercel-builds-a-next-js-app-with-process-env-undefined-in-client-codehttps://bfzli.com/vercel-builds-a-next-js-app-with-process-env-undefined-in-client-codeShow why browser bundles cannot read server-only env vars and how to separate build-time, server, and client values.Sun, 25 Oct 2026 00:00:00 GMTvercelnextjsenvironment-variablesbuildclienthttps://bfzli.com/turborepo-keeps-rebuilding-the-same-package-because-a-task-writes-into-its-own-input-directoryhttps://bfzli.com/turborepo-keeps-rebuilding-the-same-package-because-a-task-writes-into-its-own-input-directoryStop a watch loop caused by generated files landing inside a task's watched inputs and triggering endless rebuilds.Sat, 24 Oct 2026 00:00:00 GMTturborepomonorepowatchbuildfilesystemhttps://bfzli.com/electron-fails-with-ipcrenderer-is-undefined-when-the-preload-bridge-is-not-exposed-through-contextbridgehttps://bfzli.com/electron-fails-with-ipcrenderer-is-undefined-when-the-preload-bridge-is-not-exposed-through-contextbridgeExplain why a renderer cannot see `ipcRenderer` under context isolation and how to expose only the API you need.Fri, 23 Oct 2026 00:00:00 GMTelectronipcpreloadcontextbridgesecurityhttps://bfzli.com/remix-sends-a-form-submission-to-the-wrong-route-because-the-action-path-is-relativehttps://bfzli.com/remix-sends-a-form-submission-to-the-wrong-route-because-the-action-path-is-relativeFix Remix forms that post to an unexpected sibling route when a relative action path resolves against the current URL.Thu, 22 Oct 2026 00:00:00 GMTremixformsroutingactionjavascripthttps://bfzli.com/express-leaves-api-users-unreachable-when-the-router-mounts-after-the-catch-allhttps://bfzli.com/express-leaves-api-users-unreachable-when-the-router-mounts-after-the-catch-allShow why a later catch-all route shadows mounted Express routers and how to order middleware so nested routes resolve correctly.Wed, 21 Oct 2026 00:00:00 GMTexpressroutingmiddlewarenodejshttphttps://bfzli.com/react-native-metro-rejects-an-image-import-with-requiring-unknown-module-for-a-file-outside-the-project-roothttps://bfzli.com/react-native-metro-rejects-an-image-import-with-requiring-unknown-module-for-a-file-outside-the-project-rootExplain why Metro fails on image imports that resolve outside the bundle root and how to restructure or alias the asset path.Tue, 20 Oct 2026 00:00:00 GMTreact-nativemetrobundlerassetsjavascripthttps://bfzli.com/next-js-hydration-mismatch-css-module-class-names-render-differently-on-server-and-clienthttps://bfzli.com/next-js-hydration-mismatch-css-module-class-names-render-differently-on-server-and-clientFix hydration errors caused by mismatched CSS Module class names between server-rendered HTML and client hydration.Mon, 19 Oct 2026 00:00:00 GMTnextjsreacthydrationcss-modulesssrhttps://bfzli.com/astro-serves-broken-images-after-deployment-because-the-asset-path-points-at-the-wrong-originhttps://bfzli.com/astro-serves-broken-images-after-deployment-because-the-asset-path-points-at-the-wrong-originFix deployed Astro pages that load HTML but 404 their CSS, JS, or image assets from an incorrect public path.Thu, 15 Oct 2026 00:00:00 GMTastroassetsdeploymentstatic-sitehttps://bfzli.com/remix-reads-process-env-in-a-route-loader-but-the-variable-is-undefined-in-productionhttps://bfzli.com/remix-reads-process-env-in-a-route-loader-but-the-variable-is-undefined-in-productionFix route loaders and actions that work locally but lose environment values after deployment or adapter changes.Wed, 14 Oct 2026 00:00:00 GMTremixenvloaderdeploymenthttps://bfzli.com/nginx-closes-a-websocket-connection-after-the-upgrade-because-the-timeout-is-too-lowhttps://bfzli.com/nginx-closes-a-websocket-connection-after-the-upgrade-because-the-timeout-is-too-lowFix an Nginx reverse proxy that accepts a WebSocket upgrade but drops the socket during idle periods.Tue, 13 Oct 2026 00:00:00 GMTnginxwebsocketproxytimeoutreverse-proxyhttps://bfzli.com/fastapi-rejects-a-json-request-with-422-because-the-pydantic-model-does-not-match-the-payloadhttps://bfzli.com/fastapi-rejects-a-json-request-with-422-because-the-pydantic-model-does-not-match-the-payloadFix a FastAPI validation error caused by field names, types, or nesting that do not match the incoming JSON body.Mon, 12 Oct 2026 00:00:00 GMTfastapipydanticpythonvalidationjsonhttps://bfzli.com/cargo-builds-a-rust-cli-but-the-installed-command-never-appears-in-pathhttps://bfzli.com/cargo-builds-a-rust-cli-but-the-installed-command-never-appears-in-pathFix a Rust package that compiles but does not install a runnable binary because the crate metadata is incomplete.Sun, 11 Oct 2026 00:00:00 GMTrustcargoclipublishingbinaryhttps://bfzli.com/go-fails-to-accept-local-requests-because-net-http-listens-on-the-wrong-interfacehttps://bfzli.com/go-fails-to-accept-local-requests-because-net-http-listens-on-the-wrong-interfaceFix a Go server that starts cleanly but refuses local connections because it bound to the wrong host or port.Sat, 10 Oct 2026 00:00:00 GMTgonet-httplocalhostnetworkingserverhttps://bfzli.com/next-js-server-components-return-stale-data-after-a-mutation-because-the-cache-was-not-invalidatedhttps://bfzli.com/next-js-server-components-return-stale-data-after-a-mutation-because-the-cache-was-not-invalidatedFix stale server-rendered data in Next.js after a write operation by revalidating the affected path or tag.Fri, 09 Oct 2026 00:00:00 GMTnextjsreact-server-componentscacherevalidateapp-routerhttps://bfzli.com/cloudflare-workers-fails-to-serve-a-custom-domain-after-the-route-is-missing-in-wrangler-tomlhttps://bfzli.com/cloudflare-workers-fails-to-serve-a-custom-domain-after-the-route-is-missing-in-wrangler-tomlFix a Worker that deploys but never answers traffic on its custom domain because the route binding is absent.Thu, 08 Oct 2026 00:00:00 GMTcloudflare-workerswranglerdomainsroutesdeploymenthttps://bfzli.com/bun-locks-a-sqlite-database-during-a-migration-and-other-requests-stallhttps://bfzli.com/bun-locks-a-sqlite-database-during-a-migration-and-other-requests-stallExplain why Bun migrations can block SQLite access and how to avoid long exclusive locks.Wed, 07 Oct 2026 00:00:00 GMTbunsqlitemigrationsdatabaseconcurrencyhttps://bfzli.com/astro-proxies-a-cross-origin-api-request-but-drops-cookies-and-authorization-headershttps://bfzli.com/astro-proxies-a-cross-origin-api-request-but-drops-cookies-and-authorization-headersFix an Astro endpoint that forwards cross-origin requests without preserving credentials or auth headers.Tue, 06 Oct 2026 00:00:00 GMTastroapicorscookiesfetchhttps://bfzli.com/bun-starts-a-package-binary-but-the-command-is-not-found-in-node-modules-binhttps://bfzli.com/bun-starts-a-package-binary-but-the-command-is-not-found-in-node-modules-binWhy a Bun-installed CLI fails to launch from a package binary and how to expose the executable correctly.Mon, 05 Oct 2026 00:00:00 GMTbunclipackage-jsonbinpackaginghttps://bfzli.com/docker-compose-cannot-resolve-a-service-name-because-the-container-is-on-the-wrong-networkhttps://bfzli.com/docker-compose-cannot-resolve-a-service-name-because-the-container-is-on-the-wrong-networkWhy one Compose service cannot reach another by name and how network membership controls DNS resolution.Sun, 04 Oct 2026 00:00:00 GMTdockerdocker-composenetworkingdnscontainershttps://bfzli.com/react-native-android-fails-with-duplicate-class-during-gradle-compilationhttps://bfzli.com/react-native-android-fails-with-duplicate-class-during-gradle-compilationWhy Android builds stop on duplicate classes in React Native and how to identify the conflicting dependency.Sat, 03 Oct 2026 00:00:00 GMTreact-nativeandroidgradledependenciesbuildhttps://bfzli.com/nuxt-breaks-in-the-browser-when-a-client-component-imports-a-server-only-composablehttps://bfzli.com/nuxt-breaks-in-the-browser-when-a-client-component-imports-a-server-only-composableWhy a browser component crashes after importing a composable that touches server-only APIs in Nuxt.Fri, 02 Oct 2026 00:00:00 GMTnuxtvuessrcomposablesruntimehttps://bfzli.com/next-js-loads-a-self-hosted-font-with-foit-after-next-font-is-skippedhttps://bfzli.com/next-js-loads-a-self-hosted-font-with-foit-after-next-font-is-skippedHow a self-hosted font flashes or swaps late in Next.js when it bypasses `next/font` optimization.Thu, 01 Oct 2026 00:00:00 GMTnextjsfontsperformancecsslayouthttps://bfzli.com/next-js-route-handlers-throw-typeerror-body-has-already-been-read-after-parsing-request-json-twicehttps://bfzli.com/next-js-route-handlers-throw-typeerror-body-has-already-been-read-after-parsing-request-json-twiceWhy a Next.js route handler fails after the request body is consumed more than once, and how to preserve the stream.Wed, 30 Sep 2026 00:00:00 GMTnextjsroute-handlersrequest-bodyfetchstreaminghttps://bfzli.com/vite-builds-succeed-but-the-server-serves-the-wrong-dist-folderhttps://bfzli.com/vite-builds-succeed-but-the-server-serves-the-wrong-dist-folderWhy a deployment can show an old or empty app after a successful Vite build, and how to point the server at the right output.Tue, 29 Sep 2026 00:00:00 GMTvitedeploymentdisthostingbuildhttps://bfzli.com/bun-publishes-a-cli-that-runs-without-node-modules-bin-when-the-binary-field-is-wronghttps://bfzli.com/bun-publishes-a-cli-that-runs-without-node-modules-bin-when-the-binary-field-is-wrongHow a Bun package can ship successfully but expose no working command because the bin entry points at the wrong file.Mon, 28 Sep 2026 00:00:00 GMTbunclipublishingpackage-jsonnpmhttps://bfzli.com/cloudflare-workers-scheduled-triggers-never-run-because-the-cron-pattern-is-missing-from-wrangler-tomlhttps://bfzli.com/cloudflare-workers-scheduled-triggers-never-run-because-the-cron-pattern-is-missing-from-wrangler-tomlWhy a Worker deploys successfully but its scheduled job never fires, and how to register the cron trigger correctly.Sun, 27 Sep 2026 00:00:00 GMTcloudflare-workerscronwranglerscheduled-triggersedgehttps://bfzli.com/hono-sends-an-empty-response-when-a-handler-forgets-to-return-c-texthttps://bfzli.com/hono-sends-an-empty-response-when-a-handler-forgets-to-return-c-textHow a Hono route can finish without a body when the handler does not return the response object.Sat, 26 Sep 2026 00:00:00 GMThonohttproutingresponsemiddlewarehttps://bfzli.com/node-cli-fails-with-err-require-esm-when-require-loads-an-esm-dependencyhttps://bfzli.com/node-cli-fails-with-err-require-esm-when-require-loads-an-esm-dependencyWhy a published Node CLI crashes on startup when CommonJS reaches an ESM-only package, and how to fix the import boundary.Fri, 25 Sep 2026 00:00:00 GMTnodecliesmcommonjspackage-jsonhttps://bfzli.com/sveltekit-tests-throw-referenceerror-window-is-not-defined-in-jsdomhttps://bfzli.com/sveltekit-tests-throw-referenceerror-window-is-not-defined-in-jsdomWhy browser globals are missing in SvelteKit tests and how to run server-only code under a DOM-aware test environment.Thu, 24 Sep 2026 00:00:00 GMTsveltekittestingjsdomvitestnodehttps://bfzli.com/dockerfile-builds-a-next-js-app-then-node-crashes-with-err-ossl-evp-unsupportedhttps://bfzli.com/dockerfile-builds-a-next-js-app-then-node-crashes-with-err-ossl-evp-unsupportedA Docker image with the wrong Node or OpenSSL version can break Next.js builds; align the base image and runtime.Wed, 23 Sep 2026 00:00:00 GMTdockernextjsnodeopensslhttps://bfzli.com/postgres-generates-duplicate-ids-after-a-manual-import-leaves-the-sequence-behindhttps://bfzli.com/postgres-generates-duplicate-ids-after-a-manual-import-leaves-the-sequence-behindPostgres inserts collide when an imported table’s sequence is lower than existing rows; reset the sequence to match the data.Tue, 22 Sep 2026 00:00:00 GMTpostgressqlsequencemigrationshttps://bfzli.com/deno-fails-a-fetch-call-with-requires-net-access-in-a-workerhttps://bfzli.com/deno-fails-a-fetch-call-with-requires-net-access-in-a-workerDeno blocks outbound requests without the right permission flags or allowlist; grant network access for the target host.Mon, 21 Sep 2026 00:00:00 GMTdenopermissionsfetchworkershttps://bfzli.com/vite-dev-server-fails-to-start-with-port-5173-is-already-in-usehttps://bfzli.com/vite-dev-server-fails-to-start-with-port-5173-is-already-in-useVite stops before serving when another process already binds the default port; free the port or choose a new one safely.Sun, 20 Sep 2026 00:00:00 GMTvitedev-serverportlocalhosthttps://bfzli.com/next-js-route-handler-buffers-server-sent-events-and-the-client-never-receives-updateshttps://bfzli.com/next-js-route-handler-buffers-server-sent-events-and-the-client-never-receives-updatesNext.js can buffer SSE responses unless the handler returns a streaming response with the right headers and runtime.Sat, 19 Sep 2026 00:00:00 GMTnextjsssestreamingroute-handlershttps://bfzli.com/nuxt-scheduled-task-never-runs-because-nitro-cron-is-not-registeredhttps://bfzli.com/nuxt-scheduled-task-never-runs-because-nitro-cron-is-not-registeredNuxt cron jobs stay silent when Nitro never registers the scheduled route or preset; fix the task registration and deployment target.Fri, 18 Sep 2026 00:00:00 GMTnuxtnitrocronscheduled-taskshttps://bfzli.com/cloudflare-pages-build-fails-with-require-is-not-defined-after-a-commonjs-importhttps://bfzli.com/cloudflare-pages-build-fails-with-require-is-not-defined-after-a-commonjs-importCloudflare Pages breaks when a build step loads CommonJS code in an ESM-only runtime; fix the module format mismatch.Thu, 17 Sep 2026 00:00:00 GMTcloudflare-pagesesmcommonjsbuildhttps://bfzli.com/vite-refuses-a-css-import-from-node-modules-with-does-not-exist-under-root-during-buildhttps://bfzli.com/vite-refuses-a-css-import-from-node-modules-with-does-not-exist-under-root-during-buildA production build can fail when a stylesheet import points outside Vite’s project root or references an unsupported path.Wed, 16 Sep 2026 00:00:00 GMTvitecssbuildassetsnode-moduleshttps://bfzli.com/docker-cannot-reach-postgres-on-localhost-because-the-app-container-resolves-its-own-loopback-interfacehttps://bfzli.com/docker-cannot-reach-postgres-on-localhost-because-the-app-container-resolves-its-own-loopback-interfaceA containerized app fails to connect to `localhost` because `127.0.0.1` points at the container, not the database host.Tue, 15 Sep 2026 00:00:00 GMTdockerpostgresnetworkingcontainerlocalhosthttps://bfzli.com/nuxt-ignores-a-client-only-widget-during-static-generation-because-the-page-was-rendered-at-build-timehttps://bfzli.com/nuxt-ignores-a-client-only-widget-during-static-generation-because-the-page-was-rendered-at-build-timeA widget that depends on browser APIs disappears or fails when Nuxt prerenders the page as static HTML.Mon, 14 Sep 2026 00:00:00 GMTnuxtssgprerenderclient-onlynitrohttps://bfzli.com/hono-loses-session-cookies-on-cross-origin-requests-because-fetch-never-sends-credentialshttps://bfzli.com/hono-loses-session-cookies-on-cross-origin-requests-because-fetch-never-sends-credentialsCookie-based auth fails when browser requests omit credentials or the response omits the correct CORS cookie headers.Sun, 13 Sep 2026 00:00:00 GMThonocookiescorssessionfetchhttps://bfzli.com/express-rejects-stripe-webhooks-with-a-signature-mismatch-when-json-middleware-consumes-the-raw-bodyhttps://bfzli.com/express-rejects-stripe-webhooks-with-a-signature-mismatch-when-json-middleware-consumes-the-raw-bodyStripe signature verification fails when Express parses the request body before you compute the webhook HMAC.Sat, 12 Sep 2026 00:00:00 GMTexpressstripewebhookraw-bodymiddlewarehttps://bfzli.com/react-native-android-fails-with-unable-to-resolve-module-after-a-native-package-is-added-to-the-bundlehttps://bfzli.com/react-native-android-fails-with-unable-to-resolve-module-after-a-native-package-is-added-to-the-bundleA release build can fail when Metro cannot bundle a dependency that imports Node or unlinked native code.Fri, 11 Sep 2026 00:00:00 GMTreact-nativeandroidmetrobundlenative-moduleshttps://bfzli.com/sveltekit-breaks-prerender-with-window-is-not-defined-when-a-server-file-imports-browser-codehttps://bfzli.com/sveltekit-breaks-prerender-with-window-is-not-defined-when-a-server-file-imports-browser-codePrerendered SvelteKit pages crash when server-side code pulls in a browser-only module that touches `window` during build.Thu, 10 Sep 2026 00:00:00 GMTsveltekitprerenderssrwindowbuildhttps://bfzli.com/nginx-proxies-a-websocket-endpoint-but-the-client-fails-the-upgrade-with-400-bad-requesthttps://bfzli.com/nginx-proxies-a-websocket-endpoint-but-the-client-fails-the-upgrade-with-400-bad-requestFix WebSocket proxying by forwarding the upgrade headers and using the right HTTP version.Wed, 09 Sep 2026 00:00:00 GMTnginxwebsocketproxyheadershttps://bfzli.com/docker-compose-starts-an-api-before-postgres-is-ready-and-the-app-logs-econnrefusedhttps://bfzli.com/docker-compose-starts-an-api-before-postgres-is-ready-and-the-app-logs-econnrefusedUse health checks and dependency conditions so Compose waits for Postgres instead of starting the app too early.Tue, 08 Sep 2026 00:00:00 GMTdockercomposepostgreshealthcheckhttps://bfzli.com/node-imports-a-local-esm-file-as-err-module-not-found-because-the-path-is-not-a-file-urlhttps://bfzli.com/node-imports-a-local-esm-file-as-err-module-not-found-because-the-path-is-not-a-file-urlFix local ESM imports in Node when relative paths or missing extensions stop module resolution.Mon, 07 Sep 2026 00:00:00 GMTnodeesmimportsfilesystemhttps://bfzli.com/remix-streams-defer-data-but-the-page-stalls-because-no-await-boundary-wraps-ithttps://bfzli.com/remix-streams-defer-data-but-the-page-stalls-because-no-await-boundary-wraps-itMake Remix deferred data render correctly by wiring the loader, suspense boundary, and fallback together.Sun, 06 Sep 2026 00:00:00 GMTremixstreamingsuspensedeferhttps://bfzli.com/express-mounts-a-router-at-the-wrong-path-and-every-nested-route-returns-cannot-get-apihttps://bfzli.com/express-mounts-a-router-at-the-wrong-path-and-every-nested-route-returns-cannot-get-apiFix router mounting mistakes that make Express serve 404s for routes that exist in the child router.Sat, 05 Sep 2026 00:00:00 GMTexpressroutingrouterhttphttps://bfzli.com/deno-fails-to-run-an-npm-package-because-npm-imports-need-an-explicit-permission-or-lockfile-entryhttps://bfzli.com/deno-fails-to-run-an-npm-package-because-npm-imports-need-an-explicit-permission-or-lockfile-entryFix Deno package loading when an npm dependency is blocked, unresolved, or missing from the module graph.Fri, 04 Sep 2026 00:00:00 GMTdenonpmimportsmodule-resolutionhttps://bfzli.com/react-native-android-fails-with-plugin-id-com-facebook-react-was-not-foundhttps://bfzli.com/react-native-android-fails-with-plugin-id-com-facebook-react-was-not-foundResolve the Gradle plugin lookup failure that blocks Android builds after a React Native upgrade or template change.Thu, 03 Sep 2026 00:00:00 GMTreact-nativeandroidgradlekotlinhttps://bfzli.com/hono-returns-a-cors-failure-when-access-control-allow-headers-omits-content-typehttps://bfzli.com/hono-returns-a-cors-failure-when-access-control-allow-headers-omits-content-typeFix Hono responses that fail browser preflight because the server does not allow the request headers the client sends.Wed, 02 Sep 2026 00:00:00 GMThonocorspreflightheadershttps://bfzli.com/cloudflare-workers-reject-a-websocket-upgrade-because-the-response-is-not-a-101-switching-protocols-handshakehttps://bfzli.com/cloudflare-workers-reject-a-websocket-upgrade-because-the-response-is-not-a-101-switching-protocols-handshakeA WebSocket route fails when the Worker returns the wrong upgrade response shape.Tue, 01 Sep 2026 00:00:00 GMTcloudflare-workerswebsocketupgradehttpedgehttps://bfzli.com/node-resolves-the-wrong-file-from-package-json-exports-when-the-default-condition-is-missinghttps://bfzli.com/node-resolves-the-wrong-file-from-package-json-exports-when-the-default-condition-is-missingA package can load the wrong build target if `exports` does not declare the condition Node is using.Mon, 31 Aug 2026 00:00:00 GMTnodepackage-jsonexportsesmcommonjshttps://bfzli.com/electron-exposes-ipcrenderer-as-undefined-when-context-isolation-blocks-the-preload-bridgehttps://bfzli.com/electron-exposes-ipcrenderer-as-undefined-when-context-isolation-blocks-the-preload-bridgeA renderer cannot access Electron APIs directly when context isolation removes the preload bridge.Sun, 30 Aug 2026 00:00:00 GMTelectronpreloadcontext-isolationipcsecurityhttps://bfzli.com/remix-sends-errors-to-the-wrong-boundary-when-a-loader-throws-outside-its-routehttps://bfzli.com/remix-sends-errors-to-the-wrong-boundary-when-a-loader-throws-outside-its-routeA thrown loader error can skip the expected boundary when the route hierarchy does not match the failing segment.Sat, 29 Aug 2026 00:00:00 GMTremixloaderserror-boundaryroutingserver-renderinghttps://bfzli.com/next-js-client-navigation-stays-stuck-on-a-stale-page-after-router-refreshhttps://bfzli.com/next-js-client-navigation-stays-stuck-on-a-stale-page-after-router-refresh`router.refresh()` does not update a page when client state or caching keeps the old UI alive.Fri, 28 Aug 2026 00:00:00 GMTnextjsapp-routernavigationcachereacthttps://bfzli.com/bun-locks-sqlite-during-overlapping-writes-with-sqlite-busyhttps://bfzli.com/bun-locks-sqlite-during-overlapping-writes-with-sqlite-busyConcurrent writes in Bun can stall or fail when SQLite holds a transaction lock too long.Thu, 27 Aug 2026 00:00:00 GMTbunsqlitetransactionslockingdatabasehttps://bfzli.com/astro-returns-404-when-a-route-endpoint-lives-in-the-wrong-folderhttps://bfzli.com/astro-returns-404-when-a-route-endpoint-lives-in-the-wrong-folderAstro 404s on an endpoint when the file is placed outside the route convention or named incorrectly.Wed, 26 Aug 2026 00:00:00 GMTastroroutingendpoints404filesystemhttps://bfzli.com/cloudflare-workers-reject-crypto-createhash-with-referenceerror-crypto-is-not-definedhttps://bfzli.com/cloudflare-workers-reject-crypto-createhash-with-referenceerror-crypto-is-not-definedA Node crypto API crashes in Workers because the runtime exposes Web Crypto, not `node:crypto` globals.Tue, 25 Aug 2026 00:00:00 GMTcloudflare-workerscryptoedge-runtimeweb-cryptonodejshttps://bfzli.com/node-js-fails-to-start-a-published-cli-with-error-cannot-find-module-package-jsonhttps://bfzli.com/node-js-fails-to-start-a-published-cli-with-error-cannot-find-module-package-jsonA packaged CLI crashes because the entrypoint resolves package metadata from the wrong location.Mon, 24 Aug 2026 00:00:00 GMTnodeclinpmpackagingesmhttps://bfzli.com/hono-cannot-match-c-req-param-when-a-static-route-shadows-a-dynamic-onehttps://bfzli.com/hono-cannot-match-c-req-param-when-a-static-route-shadows-a-dynamic-oneRoute order in Hono can hide dynamic params and make `c.req.param()` return empty values.Sun, 23 Aug 2026 00:00:00 GMThonoroutingparamspath-matchingserverhttps://bfzli.com/astro-throws-referenceerror-window-is-not-defined-when-a-browser-only-import-runs-on-the-serverhttps://bfzli.com/astro-throws-referenceerror-window-is-not-defined-when-a-browser-only-import-runs-on-the-serverAstro SSR crashes when a module touches `window` during server rendering.Sat, 22 Aug 2026 00:00:00 GMTastrossrwindowbrowser-onlyislandshttps://bfzli.com/vite-serves-404s-for-assets-after-a-production-build-because-the-base-path-is-wronghttps://bfzli.com/vite-serves-404s-for-assets-after-a-production-build-because-the-base-path-is-wrongBuilt assets 404 in production when Vite emits URLs for the wrong base path.Fri, 21 Aug 2026 00:00:00 GMTviteassetsbuilddeploymentbase-pathhttps://bfzli.com/vite-resolves-the-wrong-package-in-a-pnpm-workspace-because-tsconfig-paths-leak-into-build-importshttps://bfzli.com/vite-resolves-the-wrong-package-in-a-pnpm-workspace-because-tsconfig-paths-leak-into-build-importsA pnpm monorepo can resolve a local source file instead of the published package entry point and break the build.Thu, 20 Aug 2026 00:00:00 GMTvitepnpmmonorepotsconfigmodule-resolutionhttps://bfzli.com/next-js-app-router-serves-stale-data-because-a-server-component-fetch-is-cachedhttps://bfzli.com/next-js-app-router-serves-stale-data-because-a-server-component-fetch-is-cachedNext.js can reuse a server component fetch result unless you set the right cache mode or revalidation behavior.Wed, 19 Aug 2026 00:00:00 GMTnextjsapp-routerfetchcacheserver-componentshttps://bfzli.com/react-native-fails-to-bundle-when-a-shared-module-imports-node-built-inshttps://bfzli.com/react-native-fails-to-bundle-when-a-shared-module-imports-node-built-insMetro stops bundling when shared code pulls in fs, path, or crypto that the React Native runtime cannot provide.Tue, 18 Aug 2026 00:00:00 GMTreact-nativemetrobundlingnode-core-modulesjavascripthttps://bfzli.com/point-a-custom-domain-at-cloudflare-pages-without-leaving-the-site-on-the-default-subdomainhttps://bfzli.com/point-a-custom-domain-at-cloudflare-pages-without-leaving-the-site-on-the-default-subdomainCloudflare Pages stays on the generated pages.dev hostname until DNS and the Pages custom domain are configured together.Mon, 17 Aug 2026 00:00:00 GMTcloudflare-pagesdnscustom-domainssldeploymenthttps://bfzli.com/sveltekit-throws-referenceerror-document-is-not-defined-during-server-side-renderinghttps://bfzli.com/sveltekit-throws-referenceerror-document-is-not-defined-during-server-side-renderingSvelteKit SSR crashes when a component touches document before the browser runs it; isolate browser-only code and gate it behind client checks.Sun, 16 Aug 2026 00:00:00 GMTsveltekitssrdocumentbrowser-apijavascripthttps://bfzli.com/cloudflare-pages-functions-read-undefined-environment-variables-at-runtimehttps://bfzli.com/cloudflare-pages-functions-read-undefined-environment-variables-at-runtimeMake Cloudflare Pages Functions see bound secrets and vars instead of undefined values.Thu, 13 Aug 2026 00:00:00 GMTcloudflare-pagesfunctionsenvironment-variableswrangleredgehttps://bfzli.com/next-js-cannot-optimize-images-from-an-unconfigured-remote-hosthttps://bfzli.com/next-js-cannot-optimize-images-from-an-unconfigured-remote-hostConfigure next/image so remote images stop failing with host validation and optimization errors.Wed, 12 Aug 2026 00:00:00 GMTnextjsimageswebpackremote-patternsreacthttps://bfzli.com/hono-cannot-read-c-req-param-after-a-middleware-forgets-nexthttps://bfzli.com/hono-cannot-read-c-req-param-after-a-middleware-forgets-nextFix missing route params in Hono by preserving middleware flow and route context.Tue, 11 Aug 2026 00:00:00 GMThonomiddlewareroutingtypescriptweb-frameworkhttps://bfzli.com/cloudflare-workers-fail-with-typeerror-body-has-already-been-used-for-requesthttps://bfzli.com/cloudflare-workers-fail-with-typeerror-body-has-already-been-used-for-requestUnderstand why a consumed Request body cannot be read twice in Workers and how to clone or buffer it safely.Mon, 10 Aug 2026 00:00:00 GMTcloudflare-workersfetchrequest-bodystreamsjavascripthttps://bfzli.com/express-returns-req-body-undefined-when-json-middleware-runs-too-latehttps://bfzli.com/express-returns-req-body-undefined-when-json-middleware-runs-too-lateFix req.body staying undefined in Express by placing JSON parsing middleware before your route handlers.Sun, 09 Aug 2026 00:00:00 GMTexpressbody-parsermiddlewarejsonhttphttps://bfzli.com/deploying-a-static-site-to-github-pages-breaks-asset-urls-under-a-repository-pathhttps://bfzli.com/deploying-a-static-site-to-github-pages-breaks-asset-urls-under-a-repository-pathWhy a site works locally but 404s on GitHub Pages when assets resolve from the domain root instead of the repo path.Sat, 08 Aug 2026 00:00:00 GMTgithub-pagesstatic-sitedeployasset-pathsbase-pathhttps://bfzli.com/design-a-typescript-sdk-with-multiple-entry-points-without-breaking-importshttps://bfzli.com/design-a-typescript-sdk-with-multiple-entry-points-without-breaking-importsHow to publish a typed SDK with subpath exports, preserved types, and stable import paths for ESM and CommonJS.Fri, 07 Aug 2026 00:00:00 GMTtypescriptsdkpackage-exportsesmcommonjshttps://bfzli.com/remix-returns-405-method-not-allowed-when-a-form-submits-to-the-wrong-routehttps://bfzli.com/remix-returns-405-method-not-allowed-when-a-form-submits-to-the-wrong-routeWhy a Remix form posts to a route without an action and how route matching determines which loader or action runs.Fri, 07 Aug 2026 00:00:00 GMTremixformsactionsrouteshttp-405https://bfzli.com/node-fails-to-connect-to-localhost-with-econnrefused-1-on-a-local-serverhttps://bfzli.com/node-fails-to-connect-to-localhost-with-econnrefused-1-on-a-local-serverWhy Node tries IPv6 loopback first for localhost and how to match your server bind address to the resolved address.Thu, 06 Aug 2026 00:00:00 GMTnodenetworkinglocalhostipv6econnrefusedhttps://bfzli.com/react-native-on-android-throws-referenceerror-window-is-not-defined-during-module-initializationhttps://bfzli.com/react-native-on-android-throws-referenceerror-window-is-not-defined-during-module-initializationWhy browser globals break during React Native startup on Android and how to move that code behind a native-safe boundary.Wed, 05 Aug 2026 00:00:00 GMTreact-nativeandroidreferenceerrorjavascriptnative-moduleshttps://bfzli.com/bun-throws-err-require-esm-when-a-commonjs-file-loads-an-esm-packagehttps://bfzli.com/bun-throws-err-require-esm-when-a-commonjs-file-loads-an-esm-packageWhy Bun hits ERR_REQUIRE_ESM on mixed module boundaries and how to make the import path match the package format.Tue, 04 Aug 2026 00:00:00 GMTbunesmcommonjsmodulesruntimehttps://bfzli.com/next-js-environment-variables-return-undefined-in-the-browser-after-buildhttps://bfzli.com/next-js-environment-variables-return-undefined-in-the-browser-after-buildWhy process.env values disappear in client code after a Next.js production build, and how to expose the right variables safely.Mon, 03 Aug 2026 00:00:00 GMTnextjsenvironment-variablesbuild-timeclient-sideruntime-confighttps://bfzli.com/cloudflare-workers-reject-post-requests-with-a-cors-preflight-failurehttps://bfzli.com/cloudflare-workers-reject-post-requests-with-a-cors-preflight-failureReturn the right CORS headers from a Worker so browser preflight requests stop failing.Sat, 01 Aug 2026 00:00:00 GMTcloudflare-workerscorsfetchbrowserhttps://bfzli.com/deno-cron-tasks-see-deno-env-undefined-in-scheduled-runshttps://bfzli.com/deno-cron-tasks-see-deno-env-undefined-in-scheduled-runsMake scheduled Deno jobs read environment variables reliably instead of getting undefined at runtime.Sat, 01 Aug 2026 00:00:00 GMTdenocronenvironment-variablesruntimehttps://bfzli.com/electron-throws-refused-to-execute-inline-script-when-a-sandboxed-preload-loads-local-htmlhttps://bfzli.com/electron-throws-refused-to-execute-inline-script-when-a-sandboxed-preload-loads-local-htmlFix CSP failures when Electron loads local HTML with a sandboxed preload and inline script blocked.Sat, 01 Aug 2026 00:00:00 GMTelectroncsppreloadsecurityhttps://bfzli.com/next-js-hydration-mismatch-random-uuids-render-different-html-on-server-and-clienthttps://bfzli.com/next-js-hydration-mismatch-random-uuids-render-different-html-on-server-and-clientFix hydration errors caused by non-deterministic UUIDs in server-rendered Next.js components.Sat, 01 Aug 2026 00:00:00 GMTnextjshydrationssrreacthttps://bfzli.com/node-js-fails-with-bin-not-found-after-publishing-a-package-to-npmhttps://bfzli.com/node-js-fails-with-bin-not-found-after-publishing-a-package-to-npmFix npm packages that install but do not expose the expected CLI command.Sat, 01 Aug 2026 00:00:00 GMTnodejsnpmclipublishinghttps://bfzli.com/nuxt-generates-404s-for-nested-routes-during-static-site-deploymenthttps://bfzli.com/nuxt-generates-404s-for-nested-routes-during-static-site-deploymentFix missing pages when Nuxt static generation doesn't emit the routes your host expects.Sat, 01 Aug 2026 00:00:00 GMTnuxtstatic-siteprerenderroutinghttps://bfzli.com/sqlite-returns-sqlite-busy-during-concurrent-writes-in-drizzle-ormhttps://bfzli.com/sqlite-returns-sqlite-busy-during-concurrent-writes-in-drizzle-ormReduce SQLite write contention when multiple requests try to write through Drizzle at once.Sat, 01 Aug 2026 00:00:00 GMTsqlitedrizzle-ormdatabaseconcurrencyhttps://bfzli.com/programmatically-access-lummi-ai-images-with-lummi-sdkhttps://bfzli.com/programmatically-access-lummi-ai-images-with-lummi-sdkA walkthrough on how to use the Lummi SDK to access images programmatically.Tue, 29 Apr 2025 00:00:00 GMTlummi-aisdkunofficial-sdklummi ai sdklummi apihttps://bfzli.com/extract-geo-location-data-from-an-ip-programmatically-instantlyhttps://bfzli.com/extract-geo-location-data-from-an-ip-programmatically-instantlyEasily extract geolocation data from an IP address using a simple npm package.Tue, 15 Apr 2025 00:00:00 GMTgeo-locationipip-addressgeo-location-datahttps://bfzli.com/mongo-error-bad-auth-authentication-failedhttps://bfzli.com/mongo-error-bad-auth-authentication-failedHow to fix the MongoError: bad auth Authentication failed through URI string error, when it happens and some common reasons why it might be happening.Tue, 06 Aug 2024 00:00:00 GMTmongodbmongoosedatabasemongo-atlasmongo-errorauthenticationhttps://bfzli.com/how-i-accidentally-stepped-on-a-phishing-site-and-then-helped-shut-it-downhttps://bfzli.com/how-i-accidentally-stepped-on-a-phishing-site-and-then-helped-shut-it-downFrom receiving a phishing email to the site being taken down within 24 hours, this is a story we can all learn from.Tue, 25 Jun 2024 00:00:00 GMTscamphishingsecuritystory