You can serve Supabase Edge Functions locally without installing the standalone Deno CLI: the Supabase CLI uses its own Edge Runtime for supabase functions serve. That does not mean the normal local Supabase stack is container-free: its standard setup needs Docker or a compatible container runtime. If you want to avoid Docker too, Supabase documents an experimental native-runtime option with platform limits.
What “without a separate runtime” means
If you mean avoiding a separate Deno installation just to run a function, use the Supabase CLI. Supabase’s Development Environment guide says the CLI “doesn’t use the standard Deno CLI to serve functions locally.” Deno can still be useful separately for editor support and tools such as formatting, linting, and tests, but it is not required by the local function-serving command.
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If by “separate runtime” you mean avoiding Docker or another container engine, that is a different requirement. The standard local Supabase stack uses a Docker-compatible runtime; the native alternative is experimental and has narrower platform support.
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Serve a function with the standard local stack
This is the usual workflow when a container engine is available. Install the Supabase CLI first; if it is installed in the project, invoke it through your package runner, for example with npx supabase. The commands below use supabase for readability; substitute your package-runner form if needed.
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In the project directory, initialize Supabase configuration if the project does not already have it:
supabase init. -
Start the local services:
supabase start. A Docker-compatible runtime must be running. On first start, the required images are downloaded, so setup can take a few minutes.Rank #2
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Serve one function by its directory name:
supabase functions serve <function-name>. To serve all functions, omit the name:supabase functions serve.Outdated Drivers Are Slowing You Down
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Send requests to
http://localhost:54321/functions/v1/<function-name>. Keep the serve process running while you work; edits reload automatically, so you can test changes without manually restarting the function server.Rank #3
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Know when Docker can be avoided
Supabase also documents native runtime support through the experimental supabase stack commands. Unlike the standard container-backed flow, the native runtime runs services as host processes. Supabase lists support for Linux amd64 and arm64, and macOS on Apple silicon; Windows and Intel Macs are not supported by this native runtime. The Docker and native runtimes guide explicitly labels the supabase stack commands experimental.
| Approach | Container engine | Platform and maturity | Isolation |
|---|---|---|---|
| Standard local stack | Docker or a compatible container runtime required. | Usual local workflow documented in Supabase’s local development quickstart. | Uses containers. |
Native runtime with supabase stack |
Runs services as host processes rather than requiring Docker. | Experimental; Linux amd64/arm64 and Apple silicon macOS are supported. Windows and Intel Macs are not supported. | Less isolation between local projects than containers. |
Use the standard workflow unless avoiding a container engine is essential and your host is supported. For native setup steps and any current platform changes, follow Supabase’s native-runtime guide rather than assuming the usual supabase start instructions apply.
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Check authentication if a request is rejected
A function can start successfully and still reject a request that lacks valid credentials. Supabase’s configuration documentation says JWT verification is enabled by default for locally served functions. Check the function’s JWT-verification setting and include a valid Authorization JWT when the function expects one; do not assume a runtime problem from an authentication rejection.
Troubleshoot the CLI and local ports
-
For detailed serving output, run
supabase functions serve <function-name> --debug, as described in Supabase’s function troubleshooting guide.Best Value
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Check whether ports
54321or8081are already occupied; Supabase identifies both in its troubleshooting guidance. -
If you are using the standard stack, confirm that the container engine is running. If the local services are stuck, Supabase’s quickstart suggests stopping and restarting the local stack.
-
If serving works but invocation fails, inspect the JWT requirement before changing runtimes.
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