ReferenceError: Cannot access 'isBrowser' before initialization

[clacladev]

What is the current behavior?

I am trying to use the JS sdk in a Next.js 15 App Router api route. So executed on the server.

I am instantiating Deepgram as per instructions here with

const deepgram = createClient(process.env.DEEPGRAM_API_KEY);

but I get the following error:

⨯ ReferenceError: Cannot access 'isBrowser' before initialization
    at Module.isBrowser
    ...
  page: '/api/audio/text-to-speech'
}
 POST /api/audio/text-to-speech 500 in 50ms

Steps to reproduce

• Create a Next.js 15 App router codebase
• create an api route
• in the same file add const deepgram = createClient(process.env.DEEPGRAM_API_KEY);
• call the route
• error will be thrown in the app console

Expected behavior

To just be able to use the sdk in an api route

Please tell us about your environment

We want to make sure the problem isn't specific to your operating system or programming language.

• Operating System/Version: macOS
• Language: TypeScript
• Browser: Chrome
• Next.js: 15.0.1
• @deepgram/sdk: 3.9.0

Other information

This is the stack trace:

⨯ ReferenceError: Cannot access 'isBrowser' before initialization
    at Module.isBrowser (/Users/claudio/Dev/web/cuecard/.next/server/chunks/node_modules_@deepgram_sdk_dist_module_6533bc._.js:147:23)
    at [project]/node_modules/@deepgram/sdk/dist/module/lib/constants.js [app-route] (ecmascript) (/Users/claudio/Dev/web/cuecard/.next/server/chunks/node_modules_@deepgram_sdk_dist_module_6533bc._.js:99:211)
    at instantiateModule (/Users/claudio/Dev/web/cuecard/.next/server/chunks/[turbopack]_runtime.js:589:23)
    at getOrInstantiateModuleFromParent (/Users/claudio/Dev/web/cuecard/.next/server/chunks/[turbopack]_runtime.js:644:12)
    at esmImport (/Users/claudio/Dev/web/cuecard/.next/server/chunks/[turbopack]_runtime.js:132:20)
    at [project]/node_modules/@deepgram/sdk/dist/module/lib/helpers.js [app-route] (ecmascript) (/Users/claudio/Dev/web/cuecard/.next/server/chunks/node_modules_@deepgram_sdk_dist_module_6533bc._.js:160:177)
    at instantiateModule (/Users/claudio/Dev/web/cuecard/.next/server/chunks/[turbopack]_runtime.js:589:23)
    at getOrInstantiateModuleFromParent (/Users/claudio/Dev/web/cuecard/.next/server/chunks/[turbopack]_runtime.js:644:12)
    at esmImport (/Users/claudio/Dev/web/cuecard/.next/server/chunks/[turbopack]_runtime.js:132:20)
    at [project]/node_modules/@deepgram/sdk/dist/module/packages/ListenRestClient.js [app-route] (ecmascript) (/Users/claudio/Dev/web/cuecard/.next/server/chunks/node_modules_@deepgram_sdk_dist_module_6533bc._.js:676:175)
    at instantiateModule (/Users/claudio/Dev/web/cuecard/.next/server/chunks/[turbopack]_runtime.js:589:23)
    at getOrInstantiateModuleFromParent (/Users/claudio/Dev/web/cuecard/.next/server/chunks/[turbopack]_runtime.js:644:12)
    at esmImport (/Users/claudio/Dev/web/cuecard/.next/server/chunks/[turbopack]_runtime.js:132:20)
    at [project]/node_modules/@deepgram/sdk/dist/module/packages/ListenClient.js [app-route] (ecmascript) (/Users/claudio/Dev/web/cuecard/.next/server/chunks/node_modules_@deepgram_sdk_dist_module_6533bc._.js:1269:189)
    at instantiateModule (/Users/claudio/Dev/web/cuecard/.next/server/chunks/[turbopack]_runtime.js:589:23)
    at getOrInstantiateModuleFromParent (/Users/claudio/Dev/web/cuecard/.next/server/chunks/[turbopack]_runtime.js:644:12)
    at esmImport (/Users/claudio/Dev/web/cuecard/.next/server/chunks/[turbopack]_runtime.js:132:20)
    at [project]/node_modules/@deepgram/sdk/dist/module/DeepgramClient.js [app-route] (ecmascript) (/Users/claudio/Dev/web/cuecard/.next/server/chunks/node_modules_@deepgram_sdk_dist_module_6533bc._.js:2909:185)
    at instantiateModule (/Users/claudio/Dev/web/cuecard/.next/server/chunks/[turbopack]_runtime.js:589:23)
    at getOrInstantiateModuleFromParent (/Users/claudio/Dev/web/cuecard/.next/server/chunks/[turbopack]_runtime.js:644:12)
    at esmImport (/Users/claudio/Dev/web/cuecard/.next/server/chunks/[turbopack]_runtime.js:132:20)
    at [project]/node_modules/@deepgram/sdk/dist/module/index.js [app-route] (ecmascript) <locals> (/Users/claudio/Dev/web/cuecard/.next/server/chunks/node_modules_@deepgram_sdk_dist_module_6533bc._.js:3030:175)
    at instantiateModule (/Users/claudio/Dev/web/cuecard/.next/server/chunks/[turbopack]_runtime.js:589:23)
    at getOrInstantiateModuleFromParent (/Users/claudio/Dev/web/cuecard/.next/server/chunks/[turbopack]_runtime.js:644:12)
    at esmImport (/Users/claudio/Dev/web/cuecard/.next/server/chunks/[turbopack]_runtime.js:132:20)
    at [project]/libs/deepgram/speech.ts [app-route] (ecmascript) (/Users/claudio/Dev/web/cuecard/.next/server/chunks/[root of the server]__c97bc6._.js:107:182)
    at instantiateModule (/Users/claudio/Dev/web/cuecard/.next/server/chunks/[turbopack]_runtime.js:589:23)
    at getOrInstantiateModuleFromParent (/Users/claudio/Dev/web/cuecard/.next/server/chunks/[turbopack]_runtime.js:644:12)
    at esmImport (/Users/claudio/Dev/web/cuecard/.next/server/chunks/[turbopack]_runtime.js:132:20)
    at [project]/app/api/audio/text-to-speech/route.ts [app-route] (ecmascript) (/Users/claudio/Dev/web/cuecard/.next/server/chunks/[root of the server]__c97bc6._.js:490:132)
    at instantiateModule (/Users/claudio/Dev/web/cuecard/.next/server/chunks/[turbopack]_runtime.js:589:23)
    at getOrInstantiateModuleFromParent (/Users/claudio/Dev/web/cuecard/.next/server/chunks/[turbopack]_runtime.js:644:12)
    at esmImport (/Users/claudio/Dev/web/cuecard/.next/server/chunks/[turbopack]_runtime.js:132:20)
    at [project]/node_modules/next/dist/esm/build/templates/app-route.js { INNER_APP_ROUTE => "[project]/app/api/audio/text-to-speech/route.ts [app-route] (ecmascript)" } [app-route] (ecmascript) (/Users/claudio/Dev/web/cuecard/.next/server/chunks/_5829b8._.js:47:158)
    at instantiateModule (/Users/claudio/Dev/web/cuecard/.next/server/chunks/[turbopack]_runtime.js:589:23)
    at instantiateRuntimeModule (/Users/claudio/Dev/web/cuecard/.next/server/chunks/[turbopack]_runtime.js:652:12)
    at Object.getOrInstantiateRuntimeModule (/Users/claudio/Dev/web/cuecard/.next/server/chunks/[turbopack]_runtime.js:668:12)
    at Object.<anonymous> (/Users/claudio/Dev/web/cuecard/.next/server/app/api/audio/text-to-speech/route.js:13:26)
    at Module._compile (node:internal/modules/cjs/loader:1469:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1548:10)
    at Module.load (node:internal/modules/cjs/loader:1288:32)
    at Module._load (node:internal/modules/cjs/loader:1104:12)
    at Module.require (node:internal/modules/cjs/loader:1311:19)
    at mod.require (/Users/claudio/Dev/web/cuecard/node_modules/next/dist/server/require-hook.js:65:28)
    at require (node:internal/modules/helpers:179:18)
    at requirePage (/Users/claudio/Dev/web/cuecard/node_modules/next/dist/server/require.js:103:84)
    at loadComponentsImpl (/Users/claudio/Dev/web/cuecard/node_modules/next/dist/server/load-components.js:99:57)
    at async DevServer.findPageComponentsImpl (/Users/claudio/Dev/web/cuecard/node_modules/next/dist/server/next-server.js:732:36)
    at async DevServer.findPageComponents (/Users/claudio/Dev/web/cuecard/node_modules/next/dist/server/dev/next-dev-server.js:611:20)
    at async DevServer.renderPageComponent (/Users/claudio/Dev/web/cuecard/node_modules/next/dist/server/base-server.js:2279:24) {
  page: '/api/audio/text-to-speech'
}
 POST /api/audio/text-to-speech 500 in 50ms