# Supabase Edge Functions: BOOT_ERROR
> Supabase returns BOOT_ERROR when an Edge Function fails to start: a syntax error, a bad import or missing dependency, or invalid config. How to find it.
Canonical: https://app369.com/fix/supabase-edge-function-boot-error/
Last updated: 2026-11-09
BOOT_ERROR means the Edge Function never started, so none of your code ran for that request. The cause is in how the function loads, not in what it does once running.
**Short answer**
Open the function’s logs in the Supabase Dashboard and read the first error at boot. Then run supabase functions serve on your machine: a syntax error, a failed import or a missing dependency usually shows up there before you deploy again.
Rather not fix it yourself? [**App Fix Ticket**](https://app369.com/fixed-price/flutter-firebase-bug-fix/) starts with a fixed-price diagnosis, then a fixed price for the fix before any fix work.
## **Why the function failed to start, and the fix**
1. 01 ### **A syntax error stops the function loading**
> “Check your Edge Function logs and also verify that your function code can be executed locally with supabase functions serve .” [**Supabase docs, Edge Functions error codes (BOOT_ERROR)**](https://supabase.com/docs/guides/functions/error-codes) One bad line in any imported file stops the whole function. Run it locally, fix the error the runtime prints, and redeploy.```
supabase functions serve my-function
```
2. 02 ### **An import or dependency is missing**
> “Import errors or missing dependencies” [**Supabase docs, Edge Functions error codes (BOOT_ERROR)**](https://supabase.com/docs/guides/functions/error-codes) A wrong import path, a package missing from the import map, or a module that does not run on Deno fails at boot. Check every import resolves, and pin versions.
3. 03 ### **The function configuration is invalid**
> “Invalid function configuration” [**Supabase docs, Edge Functions error codes (BOOT_ERROR)**](https://supabase.com/docs/guides/functions/error-codes) A wrong entry in the function’s configuration, for example a bad path in config.toml, stops it starting. Check the function’s section against the folder name and entry file.
4. 04 ### **Code at the top level throws (usually a different code)** Also check: Supabase documents an uncaught error thrown outside the request handler as WORKER_ERROR, a separate code from BOOT_ERROR. If the logs show a throw at the top of the file, such as a missing secret read with Deno.env.get, set the secret or read it inside the handler.
Checked against the vendor’s docs on November 9, 2026: [Supabase docs: Edge Functions error codes](https://supabase.com/docs/guides/functions/error-codes).
## **Rather hand it over?**
Fixed scope, fixed price, paid upfront. The work happens in writing; no call needed.
- [from $450**App Fix Ticket**One reproducible bug in an existing mobile or web app, diagnosed and fixed.**See scope and start**](https://app369.com/fixed-price/flutter-firebase-bug-fix/)
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Related: [**Supabase Edge Function non-2xx status code**](https://app369.com/fix/supabase-edge-function-non-2xx-status-code/) · [**Supabase Edge Function timeout**](https://app369.com/fix/supabase-edge-function-timeout/) · [**Supabase Edge Function CORS error**](https://app369.com/fix/supabase-edge-function-cors-error/) · [**Supabase Edge Function 401**](https://app369.com/fix/supabase-edge-function-401-invalid-jwt/)
Questions
## **More on this error**
**Is it the same as a non-2xx status code? **+
No. A non-2xx status means the function ran and returned an error; BOOT_ERROR means it never started.
**Will redeploying fix it? **+
Not on its own. The same code fails to boot again; fix the error the logs or a local run show first.
**Can you fix it for me? **+
If one bug is the whole problem, the App Fix Ticket covers it: a written diagnosis first, then the fix. If the app has more going on, the Launch Check is a written check of the whole app. Each issue found is rated critical, high, medium or low, with where it is and how it was confirmed. No issues worth fixing, no charge. If the Launch Check finds nothing rated medium or higher, Simon refunds the full $450. You keep the report either way. This applies to the first 10 Launch Checks bought after October 30, 2026.
A different error?
## **Describe it and get a written quote**
Send the error and what you were doing. You get a written scope, a fixed price and a timeline; Simon replies by email, usually within one business day.
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