Hey y all I m finding that the lib ` flags sdk growthbook` s GrowthBook Users #ask-questions

Hey y'all I'm finding that the lib `@flags-sdk/gro...

square-dog-17446

07/10/2025, 4:03 PM

Hey y'all I'm finding that the lib

@flags-sdk/growthbook

seems to be unusable in my NextJS App Router application. When I try to implement the adapter with

createGrowthbookAdapter()

and pass in my client key manually I get an error thrown client side. I'm unable to really implement this library at all due to this because this error is thrown even if that var is defined because NextJS does not expose vars to the client without the NEXT_PUBLIC prefix. Seems like a bug that needs to be fixed or is there a way I can fix in my code?

square-dog-17446

07/10/2025, 4:03 PM

Error:

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Error: Missing GROWTHBOOK_CLIENT_KEY env var
    at createUnhandledError (webpack-internal:///(app-pages-browser)/../../node_modules/.pnpm/next@15.2.4_@babel+core@7.26.0_@opentelemetry+api@1.9.0_babel-plugin-macros@3.1.0_react_ff0eefa9d84df6ffbb4024f84f17467a/node_modules/next/dist/client/components/errors/console-error.js:27:71)
    at handleClientError (webpack-internal:///(app-pages-browser)/../../node_modules/.pnpm/next@15.2.4_@babel+core@7.26.0_@opentelemetry+api@1.9.0_babel-plugin-macros@3.1.0_react_ff0eefa9d84df6ffbb4024f84f17467a/node_modules/next/dist/client/components/errors/use-error-handler.js:45:56)
    at console.error (webpack-internal:///(app-pages-browser)/../../node_modules/.pnpm/next@15.2.4_@babel+core@7.26.0_@opentelemetry+api@1.9.0_babel-plugin-macros@3.1.0_react_ff0eefa9d84df6ffbb4024f84f17467a/node_modules/next/dist/client/components/globals/intercept-console-error.js:47:56)
    at getOrCreateDefaultGrowthbookAdapter (webpack-internal:///(app-pages-browser)/../../node_modules/.pnpm/@flags-sdk+growthbook@0.1.0_@aws-sdk+credential-provider-web-identity@3.568.0_@aws-sdk+_e76f34a1bd82cff3aba6273b8ad13c16/node_modules/@flags-sdk/growthbook/dist/index.js:115:13)
    at eval (webpack-internal:///(app-pages-browser)/../../node_modules/.pnpm/@flags-sdk+growthbook@0.1.0_@aws-sdk+credential-provider-web-identity@3.568.0_@aws-sdk+_e76f34a1bd82cff3aba6273b8ad13c16/node_modules/@flags-sdk/growthbook/dist/index.js:141:15)
    at (app-pages-browser)/../../node_modules/.pnpm/@flags-sdk+growthbook@0.1.0_@aws-sdk+credential-provider-web-identity@3.568.0_@aws-sdk+_e76f34a1bd82cff3aba6273b8ad13c16/node_modules/@flags-sdk/growthbook/dist/index.js (<http://localhost:3100/_next/static/chunks/app/page.js:29:1>)

square-dog-17446

07/10/2025, 4:04 PM

I have confirmed that GROWTHBOOK_CLIENT_KEY is not anywhere in my repo and only referenced from within the library.

strong-mouse-55694

07/10/2025, 4:59 PM

I'm creating a Next project right now w/ Flags, so I'll see if I can replicate.

square-dog-17446

07/10/2025, 7:39 PM

I think I have it working now but the bug I described above would be good to fix so if a user supplies a different ENV var name they can use that even if GROWTHBOOK_CLIENT_KEY is in fact undefined.

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