Private environmental variables returning undefined in middleware.js - Amplify | Next.js | Page 1

upbeat thunder Dec 19, 2023, 2:02 AM

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In my middleware.js file I use environmental variables. When using NEXT_PUBLIC, the variable correctly returns the desired value. However, when using a private variable, it returns undefined. This only happens when running on Amplify. Locally, using both run dev and start, the correct value is returned regardless of if it is private or public. Can this be due to a misconfiguration in NextJS or is it a limitation with middleware.js?

pale groveBOT Dec 19, 2023, 2:02 AM

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Hi @upbeat thunder. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:

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Based on the information provided in the extracts, it seems that there are some known issues with accessing environment variables in the middleware in Next.js.

In Next.js, you can use process.env to access Environment Variables (https://nextjs.org/docs/app/building-your-application/configuring/environment-variables) for both next dev and next build as mentioned in the Next.js documentation (https://nextjs.org/docs/pages/api-reference/edge). However, there are some limitations and specific ways to access these variables as mentioned in the Next.js FAQ (https://nextjs.org/docs/pages/api-reference/functions/next-server).

For example, you can directly log process.env.MY_ENV_VARIABLE, or destructure it like const { MY_ENV_VARIABLE } = process.env, but you cannot access it dynamically like const getEnv = name => process.env[name].

There are also some Github issues (https://github.com/vercel/next.js/issues/53382) reported where users have experienced problems with environment variables not being defined in middleware.ts on Vercel, especially when they are not prefixed with NEXT_PUBLIC_.

However, these issues seem to be specific to the Vercel platform and the Turbopack feature in Next.js, and there's no mention of Amplify in the provided extracts. Therefore, it's hard to say if the issue you're experiencing is due to a misconfiguration in Next.js, a limitation with middleware.js, or a specific issue with Amplify.

I would recommend checking your configuration and the way you're accessing the environment variables in your `middleware.js` file. If the issue persists, it might be worth reaching out to the Amplify support or the Next.js community for further assistance.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

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@upbeat thunder kapa.ai is still learning and improving, please let us know how it did by reacting below

upbeat thunder Dec 19, 2023, 2:25 AM

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how should i go about troubleshooting this? <@&1089670008898080870>

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@pale grove how should i go about troubleshooting this?

pale groveBOT Dec 19, 2023, 2:30 AM

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Let me check the knowledge base for you. One moment! :books:

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Here are some steps you can take to troubleshoot the issue:

Redeploy your application: After adding a new Environment Variable, ensure that you have redeployed your application. Environment Variables are made available to the app on each deployment. If you attempt to read an Environment Variable that was added after the deployment was made, its value will be undefined (source (https://vercel.com/guides/how-to-add-vercel-environment-variables)).
Check the environment(s) you have added the variable to: If you've added the Environment Variable, but it remains undefined on a new deployment, consider the environment(s) you have added the variable to and make sure the Environment Variable is present in the UI for the type of deployment you are accessing (source (https://vercel.com/guides/how-to-add-vercel-environment-variables)).
Update your local .env file: If you have used vercel env pull to create a local .env file, you can either delete it or use the vercel env pull command to pull the values from your Project Settings into your local file (source (https://vercel.com/guides/how-to-add-vercel-environment-variables)).
Print out the variable's contents: Printing out the variable's contents is recommended as a troubleshooting step in cases where a function that depends on the variable's value is failing. You can log values directly from your Serverless Function or prefix your build script with echo $MY_ENV_VAR; build command --here (source (https://vercel.com/guides/how-to-add-vercel-environment-variables)).

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Check for inconsistencies: Some users have reported inconsistencies with environment variables in middleware.ts on Vercel, especially when they are not prefixed with NEXT_PUBLIC_. If you're experiencing similar issues, it might be worth checking if this is the case (source (https://github.com/vercel/next.js/issues/53382)).
Upgrade to the latest version of Next.js: Some issues with environment variables in middleware.ts have been reported to be fixed in the latest versions of Next.js (source (https://github.com/vercel/next.js/issues/51493)).

#Private environmental variables returning undefined in middleware.js - Amplify

I would recommend checking your configuration and the way you're accessing the environment variables in your `middleware.js` file. If the issue persists, it might be worth reaching out to the Amplify support or the Next.js community for further assistance.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

If none of these steps resolve the issue, it might be worth reaching out to the Next.js or Amplify communities for further assistance.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

#Private environmental variables returning undefined in middleware.js - Amplify

I would recommend checking your configuration and the way you're accessing the environment variables in your middleware.js file. If the issue persists, it might be worth reaching out to the Amplify support or the Next.js community for further assistance.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

If none of these steps resolve the issue, it might be worth reaching out to the Next.js or Amplify communities for further assistance.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

I would recommend checking your configuration and the way you're accessing the environment variables in your `middleware.js` file. If the issue persists, it might be worth reaching out to the Amplify support or the Next.js community for further assistance.