#Environment variables error

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feral summitBOT
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Hi @turbid lynx. 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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In Next.js, environment variables without the NEXT_PUBLIC_ prefix are only available in the Node.js environment, meaning they aren't accessible to the browser. This is because the client runs in a different environment. If you want to make the value of an environment variable accessible in the browser, you need to prefix the variable with NEXT_PUBLIC_. This will tell Next.js to replace all references to process.env.**variable] in the Node.js environment with the value from the environment in which you run next build, allowing you to use it anywhere in your code. It will be inlined into any JavaScript sent to the browser [source** (https://nextjs.org/docs/pages/building-your-application/configuring/environment-variables#bundling-environment-variables-for-the-browser).

However, when deploying your Next.js application to Vercel, your environment variables in .env* files will not be made available to Edge Runtime, unless their name are prefixed with NEXT_PUBLIC_. It's recommended to manage your environment variables in Project Settings instead, from where all environment variables are available source (https://github.com/vercel/next.js/issues/67296).

If you're experiencing issues with environment variables in middleware, it's worth noting that any environment variable that is not using NEXT_PUBLIC_ is undefined in the middleware when deployed on Vercel source (https://github.com/vercel/next.js/issues/53382).

Please ensure that your environment variables are correctly prefixed and managed according to these guidelines.

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

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

turbid lynx
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@feral summit I'm using one server-side variable to fetch data on server

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

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In Next.js, you can use server-side variables to fetch data on the server using the getServerSideProps function. This function is run on the server on every request, making it ideal for fetching data that changes often. Here's an example:

export async function getServerSideProps() {
  // Fetch data from external API
  const res = await fetch(`<https://.../data`>)
  const data = await res.json()
 
  // Pass data to the page via props
  return { props: { data } }
}

In this example, getServerSideProps fetches data from an external API and passes it to the page via props. The fetched data is then used to pre-render the page on the server source (https://nextjs.org/docs/pages/building-your-application/rendering/server-side-rendering).

However, be aware that if your server-side variable is an environment variable, it should not be exposed to the client unless it's prefixed with NEXT_PUBLIC_. If the variable is not prefixed with NEXT_PUBLIC_, Next.js will replace it with an empty string to prevent it from being leaked to the client source (https://nextjs.org/docs/app/building-your-application/rendering/composition-patterns#keeping-server-only-code-out-of-the-client-environment).

If you need to fetch data in a client component, you can call a Route Handler from the client. Route Handlers execute on the server and return the data to the client. This is useful when you don't want to expose sensitive information to the client, such as API tokens source (https://nextjs.org/docs/app/building-your-application/data-fetching/fetching-caching-and-revalidating#fetching-data-on-the-client-with-route-handlers).

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

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

turbid lynx
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@feral summit My project is not edge and my environemnt variables are still undefined

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

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If your environment variables are coming up as undefined, it could be due to a few reasons:

  1. Prefixing: In Next.js, environment variables that are meant to be exposed to the browser must be prefixed with NEXT_PUBLIC_. If they are not, they will not be included in the JavaScript bundle for the browser.

  2. File Naming: Make sure your environment variables are defined in the correct .env file. For example, .env.local is loaded for all environments except test, .env.development is loaded when next dev is run, and .env.production is loaded when next start is run.

  3. Loading Variables: Next.js automatically loads environment variables from .env files. However, these variables are only available in the Node.js environment, not in the browser. For them to be available in the browser, they need to be prefixed with NEXT_PUBLIC_.

  4. Vercel Deployment: When deploying your Next.js application to Vercel, your environment variables in .env* files will not be made available to Edge Runtime, unless their name are prefixed with NEXT_PUBLIC_. It's recommended to manage your environment variables in Project Settings instead, from where all environment variables are available source (https://github.com/vercel/next.js/issues/67296).

If you've checked all of these and your environment variables are still coming up as undefined, it might be a good idea to check your code for any typos or errors that might be causing the issue.

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

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

turbid lynx
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@feral summit I'm settings these variables in Vercel project settings

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

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If you're setting environment variables in Vercel's project settings and they're still coming up as undefined, here are a few things you could check:

  1. Environment Variables UI: Ensure that you've added the environment variables correctly through the Project Settings in Vercel. The values are encrypted at rest and permission to view values can be restricted based on your role. You can also choose a specific Git branch to set Environment Variables for with the Preview environment source (https://vercel.com/guides/how-to-add-vercel-environment-variables).

  2. Accessing Variables: Inside your application, you can access environment variables through process.env.YOUR_VALUE. Make sure you're accessing the variables correctly in your code source (https://vercel.com/guides/how-to-add-vercel-environment-variables).

  3. Deployment: After setting or changing environment variables in Vercel, you need to redeploy your application for the changes to take effect. You can do this by pushing a new commit to your repository or manually triggering a redeploy in the Vercel dashboard source (https://vercel.com/docs/deployments/environments#environment-variables).

  4. System Environment Variables: Vercel provides a set of System Environment Variables that are automatically populated by the System, such as the URL of the Deployment or the name of the Git branch deployed. To expose them to your Deployments, make sure "Automatically expose System Environment Variables" is checked in your Project Settings source (https://vercel.com/docs/projects/environment-variables/system-environment-variables#system-environment-variables-overview).

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If you've checked all of these and your environment variables are still coming up as undefined, it might be a good idea to reach out to Vercel's support for further assistance.

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