session cookie not sent with actions | Astro Lounge | Page 1

stray jasperBOT Jun 8, 2025, 9:36 AM

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Hi @mild moss. 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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Astro’s session system is designed to associate session data with a session ID stored in a cookie. By default, when you use sessions (via Astro.session or context.session), a session cookie is automatically set and sent with requests to maintain the session state between requests. This is fundamental to how Astro’s session management works: the session cookie contains only the session ID, not the session data itself, which is stored server-side. The session is created when first used, and the session cookie is automatically set. If no session storage is configured or the route is prerendered, the session object is undefined and no cookie is set or sent Session API Reference.

There is no documented configuration option to disable sending the session cookie for actions or to use sessions without a cookie. However, the API does provide a load() method that allows you to load a session by ID from a custom source (such as a header), which could be used to manage sessions without relying on cookies in specific advanced scenarios. For example:

---
// Load the session from a header instead of cookies
const sessionId = Astro.request.headers.get('x-session-id');
await Astro.session?.load(sessionId);
const cart = await Astro.session?.get('cart');
---

But this is an opt-in, manual approach and not the default behavior. In normal use, the session cookie is required and will be sent with requests, including actions, to maintain session state Session API Reference: load().

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In summary:

By default, session cookies are sent with actions.
There is no built-in option to globally disable session cookies for actions.
You can manually load sessions from another source (like a header) if you want to avoid cookies, but this requires custom implementation.

If you need to avoid cookies entirely, you must handle session ID transmission and loading yourself using the load() method, but this is not the standard or recommended approach for most use cases.

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

#

@mild moss Kapa.ai is still learning and improving, please let me know how I did by reacting below.

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

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I'm sorry, but the knowledge sources do not contain any information about changing the default path of Astro actions from /_actions/* to a custom path like /member/_actions/. The documentation only describes how actions are accessible at /_actions/[actionName] and does not mention any configuration option to change this base path Security when using actions.

If you need this functionality, you may need to look for updates in future Astro releases or consider alternative routing or proxy solutions outside of the documented Astro actions system.

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

#

@mild moss Kapa.ai is still learning and improving, please let me know how I did by reacting below.

stray jasperBOT Jun 8, 2025, 5:22 PM

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

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The error message "Cross-site POST form submissions are forbidden" is related to Astro's CSRF (Cross-Site Request Forgery) protection. Starting with Astro v5, CSRF protection is enabled by default via the security.checkOrigin option. This means Astro will check that the "origin" header of incoming POST (and some other) requests matches the site's URL. If it doesn't, the request is rejected with a 403 error Upgrade to Astro v5: Changed Defaults Configuration Reference: security.

Common causes for this error in production:

The "origin" header sent by the browser does not exactly match the deployed site URL (including protocol, domain, and port).
There is a mismatch between your site's public URL and the URL used in the form's action attribute or in fetch requests.
Proxies, load balancers, or reverse proxies (like Vercel, Netlify, or custom Nginx setups) may alter headers or affect the perceived origin.

What you can do:

Check your production URL:
Make sure the form is being submitted to the exact same origin (protocol, domain, and port) as your deployed site.
Check for proxies or custom domains:
If you are using a proxy or a custom domain, ensure that the "origin" header is preserved and matches your site's URL.

#

Disable CSRF protection (not recommended for production):
If you are certain your site does not need this protection (e.g., for internal tools), you can disable it in your astro.config.mjs:
```
export default defineConfig({
  output: "server",
  security: {
    checkOrigin: false
  }
})
```
However, this is not recommended for public-facing sites Configuration Reference: security.
Debug header values:
Log or inspect the "origin" header and the request URL in your production environment to ensure they match.

Summary:
This error is caused by Astro's CSRF protection detecting a mismatch in the "origin" header. Double-check your deployment setup and ensure all requests originate from the same domain and protocol as your production site. If you continue to have issues, you may want to review your deployment environment or temporarily disable the check for debugging purposes.

For more details, see the Astro v5 upgrade guide and security configuration reference.

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

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@mild moss Kapa.ai is still learning and improving, please let me know how I did by reacting below.

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

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Certainly! Here is an example of an astro.config.mjs that uses the default security settings, which will pass the origin check as long as the "origin" header and the POST URL match exactly (including protocol, domain, and port):

import { defineConfig } from 'astro/config';

export default defineConfig({
  output: "server",
  // The security.checkOrigin option is true by default in Astro v5+
  // You do not need to set it unless you want to disable it.
  // security: { checkOrigin: true }
});

Key points:

By default, security.checkOrigin is true in Astro v5+, so you do not need to set it explicitly unless you want to disable the check.
The check will pass if the "origin" header sent by the browser matches the deployed site’s URL exactly.
This check only applies to on-demand rendered pages (SSR) and for certain HTTP methods (POST, PATCH, DELETE, PUT) with specific content types Configuration Reference: security.

If you are still seeing errors, double-check that:

The form’s action attribute (or your fetch URL) matches your site’s public URL.
The protocol (http vs https), domain, and port are all identical between the "origin" header and the request URL.

For more details, see the Astro security configuration reference.

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#

@mild moss Kapa.ai is still learning and improving, please let me know how I did by reacting below.

mild moss Jun 11, 2025, 4:23 PM

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@stray jasper is it possible to upgrade to Astro 5.9 without upgrading the tailwind to 4 ?

stray jasperBOT Jun 11, 2025, 4:23 PM

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

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Yes, it is possible to upgrade to Astro 5.9 without upgrading Tailwind to version 4. Astro 5 supports both Tailwind 3 and Tailwind 4. If you want to keep using Tailwind 3, you should continue using the @astrojs/tailwind integration and ensure you have tailwindcss@3 installed. The documentation provides instructions for maintaining legacy Tailwind 3 support in newer Astro versions Legacy Tailwind 3 support.

You only need to upgrade to Tailwind 4 if you want to use the latest features from Tailwind. Otherwise, your existing Tailwind 3 setup will continue to work after upgrading Astro.

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

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@mild moss Kapa.ai is still learning and improving, please let me know how I did by reacting below.

mild moss Jun 15, 2025, 6:45 AM

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@stray jasper is it possible to use map((credential, index) inside my templates ?

stray jasperBOT Jun 15, 2025, 6:45 AM

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

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Yes, you can use .map((credential, index) => ...) inside your Astro templates. Astro supports JavaScript expressions in its component templates, including using .map() to iterate over arrays and render elements dynamically. For example:

<ul>
  {credentials.map((credential, index) => (
    <li>{index}: {credential.name}</li>
  ))}
</ul>

This pattern is shown in the documentation, where arrays are mapped to generate lists or other elements in the template Write JavaScript expressions in Astro Template expressions reference. Using the `index` parameter is fully supported and works as in standard JavaScript.

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

#

@mild moss Kapa.ai is still learning and improving, please let me know how I did by reacting below.

mild moss Jun 15, 2025, 6:46 AM

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@stray jasper then why am i getting :

12:14:28 [ERROR] index is not defined
Stack trace:

stray jasperBOT Jun 15, 2025, 6:46 AM

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

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If you are getting the error index is not defined when using .map((credential, index) => ...) in your Astro template, it likely means that the index variable is not being defined in the scope of your map function. In Astro, you must define both parameters in the arrow function inside .map(), just like in standard JavaScript.

For example, this is correct and will work:

<ul>
  {credentials.map((credential, index) => (
    <li>{index}: {credential.name}</li>
  ))}
</ul>

However, if you write:

<ul>
  {credentials.map((credential) => (
    <li>{index}: {credential.name}</li>
  ))}
</ul>

You will get the error index is not defined because index is not declared in the function parameters.

The knowledge sources confirm that you can use .map() with both value and index in Astro templates, just as you would in JavaScript or JSX Write JavaScript expressions in Astro Template expressions reference.

Summary:
Make sure you include both parameters in your `.map()` function:
`array.map((item, index) => ...)`
Otherwise, `index` will be undefined and cause the error you are seeing.

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

#

@mild moss Kapa.ai is still learning and improving, please let me know how I did by reacting below.

#

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

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Based on the knowledge sources, your usage of .map((credential, index) => ...) is correct for iterating and accessing both the item and its index in Astro templates Template expressions reference. However, the specific pattern you are using:

<div slot={`item-${index}`}>

may be problematic. According to the documentation, Astro does not support dynamically generating slot names within a map function. Slot names must be static and cannot be created dynamically in this way:

Note: It is not possible to dynamically generate an Astro slot name, such as within a map function. If this feature is needed within UI framework components, it might be best to generate these dynamic slots within the framework itself Named Slots.

This restriction could be causing the error you are seeing, even though your .map() syntax is otherwise correct. Astro expects slot names to be static strings, not expressions.

Summary:

Using .map((credential, index) => ...) is valid in Astro templates.
Dynamically generating slot names (e.g., slot={item-${index}}) is not supported in Astro components. This is likely the cause of your error.

If you need dynamic slot-like behavior, consider using a UI framework component (like React, Vue, etc.) for that part of your template, or refactor your component to use static slot names.

For more details, see the Astro documentation on named slots.

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

#

@mild moss Kapa.ai is still learning and improving, please let me know how I did by reacting below.

mild moss Jun 21, 2025, 3:13 PM

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@stray jasper is it possible to read a json in my astro component; make changes to the json array and commit it back ?

stray jasperBOT Jun 21, 2025, 3:13 PM

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

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Based on the knowledge sources, you can read a JSON file in your Astro component by importing it or using the file() loader in content collections. You can also modify the data in memory within your component script. However, there is no information in the documentation that supports writing changes back to the JSON file from an Astro component.

Astro components run on the server at build time (or on-demand in SSR), and their code is not intended to perform file system write operations as part of a typical site build or request. The examples provided in the documentation only show reading and using JSON data, not committing changes back to the file system Import statements Content collections.

Summary:

You can read and modify JSON data in memory in your Astro component.
There is no documented way to write (commit) changes back to the JSON file from within an Astro component.

If you need to persist changes to a JSON file, you would need to implement a custom server-side API or script outside of the standard Astro component lifecycle. The knowledge sources do not provide guidance on this.

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

#

@mild moss Kapa.ai is still learning and improving, please let me know how I did by reacting below.

stray jasperBOT Jun 25, 2025, 12:29 PM

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

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Yes, Astro supports <script type="module">. In fact, by default, Astro processes <script> tags as JavaScript modules, and the processed script will be injected with type="module" in the final HTML output. This allows you to use modern JavaScript features and import statements inside your scripts. You do not need to explicitly add type="module" unless you are using the is:inline directive or other attributes, in which case you must add it to use import statements Using <script> in Astro Common Error Messages.

Here’s an example from the documentation:

<script>
  // This will be processed and injected as <script type="module">
  import confetti from 'canvas-confetti';
  // ...your code
</script>

If you add attributes (other than `src`) to your `<script>` tag, Astro treats it as `is:inline`, and you must explicitly add `type="module"` to use ESM imports Script & Style Directives.

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

#

@mild moss Kapa.ai is still learning and improving, please let me know how I did by reacting below.

stray jasperBOT Jul 6, 2025, 5:46 AM

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

#

To send the Cross-Origin-Opener-Policy: same-origin-allow-popups header for some routes in Astro, you can set custom HTTP response headers using the Astro.response.headers object in your page or endpoint when using on-demand rendering (SSR). Here’s how you can do it:

---
// For on-demand rendered pages (SSR)
export const prerender = false; // Not needed in 'server' mode
Astro.response.headers.set('Cross-Origin-Opener-Policy', 'same-origin-allow-popups');
---
<html>
  <!-- Page content -->
</html>

This will set the header only for the specific route where you include this code On-demand rendering: Response.

Note:

This approach works for SSR or on-demand rendered pages. For static pages, you would need to use your hosting provider’s configuration for custom headers.
Do not reassign Astro.response.headers; use .set() to add or modify headers Astro.response.headers must not be reassigned.

If you need to set this header for multiple routes, repeat this logic in each relevant page or endpoint.

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

#

@mild moss Kapa.ai is still learning and improving, please let me know how I did by reacting below.

mild moss Jul 6, 2025, 5:48 AM

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@stray jasper so it will not work on pre-rendered routes ..

stray jasperBOT Jul 6, 2025, 5:48 AM

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

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Correct, setting custom response headers like `Cross-Origin-Opener-Policy` using `Astro.response.headers.set()` will not work on pre-rendered (static) routes. This method is only available for pages rendered on demand (SSR). For prerendered pages, headers must be set using your hosting provider’s configuration, as Astro cannot modify response headers after the static HTML has been generated On-demand rendering: Response On-demand rendering features.

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

#

@mild moss Kapa.ai is still learning and improving, please let me know how I did by reacting below.

mild moss Jul 7, 2025, 6:56 PM

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@stray jasper how should i protect my actions with a session cookie ?

stray jasperBOT Jul 7, 2025, 6:56 PM

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

#

To protect your Astro actions with a session cookie, you should perform an authentication check inside your action handler to ensure the user has a valid session. The recommended approach is to check for the presence and validity of the session (or session cookie) in the handler, and throw an ActionError with the code "UNAUTHORIZED" if the user is not authenticated. Here’s an example from the documentation:

import { defineAction, ActionError } from "astro:actions";

export const server = {
  likePost: defineAction({
    handler: async (_input, context) => {
      if (!context.cookies.has('user-session')) {
        throw new ActionError({
          code: "UNAUTHORIZED",
          message: "User must be logged in.",
        });
      }
      // ...perform the action for authenticated users
    },
  }),
};

This ensures that only requests with a valid session cookie (e.g., user-session) can access the action. If the session is missing or invalid, the action will return an error and prevent unauthorized access Security when using actions Handling backend errors in your action.

Summary:

Check for the session cookie in your action handler using context.cookies.has('your-session-cookie').
Throw an ActionError with code "UNAUTHORIZED" if the session is missing or invalid.
This pattern ensures your actions are protected and only accessible to authenticated users.

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

#

@mild moss Kapa.ai is still learning and improving, please let me know how I did by reacting below.

mild moss Jul 10, 2025, 9:25 AM

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@stray jasper what is this issue ?

14:53:19 [ERROR] EnvInvalidVariables: The following environment variables defined in env.schema are invalid:

and why is it throwing inspite of having it in all the 3 of my environment varialbes ?

.env.development
.env.production
.env.deployment

?

stray jasperBOT Jul 10, 2025, 9:25 AM

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

#

The error

EnvInvalidVariables: The following environment variables defined in `env.schema` are invalid:

means that some environment variables you have defined in your env.schema (in your astro.config.mjs) do not match the expected data type or properties specified in the schema. This is not about whether the variables exist in your .env files, but whether their values are valid according to the schema you defined Invalid Environment Variables.

Common reasons for this error:

The variable exists, but its value does not match the type (e.g., a string instead of a number, or an invalid enum value).
The variable is missing from the environment, and it is not marked as optional in the schema.
The value does not meet additional constraints (e.g., min/max for numbers, allowed values for enums).

Why does it happen even if you have the variable in all your .env files?

The value in the .env file might not match the schema (e.g., "true" instead of true for a boolean, or a string that doesn't match an enum).
The environment file being loaded might not be the one you expect (e.g., running in a mode that loads a different .env file).
There may be a typo in the variable name in either the schema or the .env file.

What to do:

Double-check the values and types in your .env files against your env.schema.
Make sure the correct .env file is being loaded for your current mode.
Review any constraints (like allowed values for enums, or min/max for numbers) in your schema.

#

For more details, see the Astro error reference for EnvInvalidVariables.

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

#

@mild moss Kapa.ai is still learning and improving, please let me know how I did by reacting below.

mild moss Jul 10, 2025, 9:29 AM

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@stray jasper but i don't get the issue in development only at build ?

stray jasperBOT Jul 10, 2025, 9:29 AM

#

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

#

This issue occurs because, by default, Astro only validates public environment variables at dev server start, but validates all variables (including secrets) at build time. Private (secret) variables are only validated at runtime in development, but are checked during the build process to ensure all required variables are present and valid before deployment. This is described in the documentation:

By default, only public variables are validated on the server when starting the dev server or a build, and private variables are validated at runtime only. If enabled, private variables will also be checked on start. This is useful in some continuous integration (CI) pipelines to make sure all your secrets are correctly set before deploying Configuration Reference: env.validateSecrets.

So, if you have a missing or invalid secret environment variable, you may not see an error in development, but you will see it during the build process. To catch these issues earlier, you can enable validateSecrets: true in your astro.config.mjs:

import { defineConfig, envField } from "astro/config"
export default defineConfig({
  env: {
    schema: {
      // ...your schema
    },
    validateSecrets: true
  }
})

This will make Astro validate all environment variables (including secrets) at dev server start, helping you catch issues before build env.validateSecrets.

#

Summary:
You see the error only at build because secret variables are not validated at dev server start by default, but are checked at build time. Enable `validateSecrets: true` to catch these issues earlier.

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

#

@mild moss Kapa.ai is still learning and improving, please let me know how I did by reacting below.

mild moss Jul 10, 2025, 9:31 AM

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@stray jasper i have validateSecrets true and even my build works fine only on astro preview i get this exception in the command line

stray jasperBOT Jul 10, 2025, 9:31 AM

#

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

#

The knowledge sources do not provide explicit information about why you might encounter the EnvInvalidVariables error only when running astro preview, even though your build and development server work fine and you have validateSecrets: true set in your config.

However, based on the documentation, here are some points to consider:

Environment Variable Loading: Astro loads environment variables based on the mode and the environment files present (e.g., .env.production for build/preview, .env.development for dev). If your variables are only present in .env.development but missing or invalid in .env.production, you may see this error only during astro preview, which uses the production environment by default Setting environment variables.
Validation Timing: With validateSecrets: true, secrets are validated at dev server start and at build time. However, astro preview runs the built server in a production-like environment, so it will expect all production environment variables to be present and valid env.validateSecrets.
.env File Used: Make sure your .env.production (or the relevant environment file for preview) contains all required variables with valid values, matching your env.schema.

Summary:
The most likely cause is that the environment variables required by your env.schema are missing or invalid in the environment used by astro preview (typically .env.production). Double-check that all required variables are present and valid in your production environment files.

#

#session cookie not sent with actions

If you need to avoid cookies entirely, you must handle session ID transmission and loading yourself using the load() method, but this is not the standard or recommended approach for most use cases.

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

If you need this functionality, you may need to look for updates in future Astro releases or consider alternative routing or proxy solutions outside of the documented Astro actions system.

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

For more details, see the Astro v5 upgrade guide and security configuration reference.

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

For more details, see the Astro security configuration reference.

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

You only need to upgrade to Tailwind 4 if you want to use the latest features from Tailwind. Otherwise, your existing Tailwind 3 setup will continue to work after upgrading Astro.

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

This pattern is shown in the documentation, where arrays are mapped to generate lists or other elements in the template Write JavaScript expressions in Astro Template expressions reference. Using the `index` parameter is fully supported and works as in standard JavaScript.

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

Summary:
Make sure you include both parameters in your `.map()` function:
`array.map((item, index) => ...)`
Otherwise, `index` will be undefined and cause the error you are seeing.

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

For more details, see the Astro documentation on named slots.

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

If you need to persist changes to a JSON file, you would need to implement a custom server-side API or script outside of the standard Astro component lifecycle. The knowledge sources do not provide guidance on this.

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

If you add attributes (other than `src`) to your `<script>` tag, Astro treats it as `is:inline`, and you must explicitly add `type="module"` to use ESM imports Script & Style Directives.

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

If you need to set this header for multiple routes, repeat this logic in each relevant page or endpoint.

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

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

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

For more details, see the Astro error reference for EnvInvalidVariables.

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

Summary:
You see the error only at build because secret variables are not validated at dev server start by default, but are checked at build time. Enable `validateSecrets: true` to catch these issues earlier.

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

If you have confirmed this and still see the error, the knowledge sources do not provide further troubleshooting steps for this specific scenario.

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

#session cookie not sent with actions

If you need to avoid cookies entirely, you must handle session ID transmission and loading yourself using the load() method, but this is not the standard or recommended approach for most use cases.

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

If you need this functionality, you may need to look for updates in future Astro releases or consider alternative routing or proxy solutions outside of the documented Astro actions system.

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

For more details, see the Astro v5 upgrade guide and security configuration reference.

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

For more details, see the Astro security configuration reference.

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

You only need to upgrade to Tailwind 4 if you want to use the latest features from Tailwind. Otherwise, your existing Tailwind 3 setup will continue to work after upgrading Astro.

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

This pattern is shown in the documentation, where arrays are mapped to generate lists or other elements in the template Write JavaScript expressions in Astro Template expressions reference. Using the index parameter is fully supported and works as in standard JavaScript.

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

Summary: Make sure you include both parameters in your .map() function: array.map((item, index) => ...) Otherwise, index will be undefined and cause the error you are seeing.

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

For more details, see the Astro documentation on named slots.

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

If you need to persist changes to a JSON file, you would need to implement a custom server-side API or script outside of the standard Astro component lifecycle. The knowledge sources do not provide guidance on this.

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

If you add attributes (other than src) to your <script> tag, Astro treats it as is:inline, and you must explicitly add type="module" to use ESM imports Script & Style Directives.

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

If you need to set this header for multiple routes, repeat this logic in each relevant page or endpoint.

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

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

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

For more details, see the Astro error reference for EnvInvalidVariables.

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

Summary: You see the error only at build because secret variables are not validated at dev server start by default, but are checked at build time. Enable validateSecrets: true to catch these issues earlier.

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

If you have confirmed this and still see the error, the knowledge sources do not provide further troubleshooting steps for this specific scenario.

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

This pattern is shown in the documentation, where arrays are mapped to generate lists or other elements in the template Write JavaScript expressions in Astro Template expressions reference. Using the `index` parameter is fully supported and works as in standard JavaScript.

Summary:
Make sure you include both parameters in your `.map()` function:
`array.map((item, index) => ...)`
Otherwise, `index` will be undefined and cause the error you are seeing.

If you add attributes (other than `src`) to your `<script>` tag, Astro treats it as `is:inline`, and you must explicitly add `type="module"` to use ESM imports Script & Style Directives.

Summary:
You see the error only at build because secret variables are not validated at dev server start by default, but are checked at build time. Enable `validateSecrets: true` to catch these issues earlier.