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22 lines
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---
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title: Using Node.js Modules in Edge Runtime
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---
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## Why This Error Occurred
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The code in your [Proxy](/docs/pages/api-reference/file-conventions/proxy) or your [Edge API Routes](/docs/pages/building-your-application/routing/api-routes) is using a feature from Node.js runtime.
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However, the Edge Runtime does not support [Node.js APIs and globals](/docs/pages/api-reference/edge#unsupported-apis).
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## Possible Ways to Fix It
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When running Next.js locally with `next dev`, your application will show in the console, and in your browser, which file is importing and using an unsupported module. This module must be avoided: either by not importing it, or by replacing it with a polyfill.
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For example, you might replace the Node.js `crypto` module with the [Web Crypto API](https://developer.mozilla.org/docs/Web/API/Web_Crypto_API).
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## Useful Links
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- [Edge Runtime Supported APIs](/docs/pages/api-reference/edge)
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- [Next.js Proxy](/docs/pages/api-reference/file-conventions/proxy)
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- [JWT Example](https://vercel.com/templates/next.js/jwt-authentication)
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