Edge Functions

Running AI Models

Run AI models in Edge Functions using the built-in Supabase AI API.

Edge Functions have a built-in API for running AI models. You can use this API to generate embeddings, build conversational workflows, and do other AI related tasks in your Edge Functions.

This allows you to:

  • Generate text embeddings without external dependencies
  • Run Large Language Models via Ollama or Llamafile
  • Build conversational AI workflows

Setup#

There are no external dependencies or packages to install to enable the API.

Create a new inference session:

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const model = new Supabase.ai.Session('model-name')

Running a model inference#

Once the session is instantiated, you can call it with inputs to perform inferences:

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// For embeddings (gte-small model)
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const embeddings = await model.run('Hello world', {
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  mean_pool: true,
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  normalize: true,
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})
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// For text generation (non-streaming)
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const response = await model.run('Write a haiku about coding', {
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  stream: false,
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  timeout: 30,
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})
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// For streaming responses
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const stream = await model.run('Tell me a story', {
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  stream: true,
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  mode: 'ollama',
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})

Generate text embeddings#

Generate text embeddings using the built-in gte-small model:

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import { withSupabase } from 'npm:@supabase/server@^1'
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const model = new Supabase.ai.Session('gte-small')
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export default {
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  fetch: withSupabase({ auth: 'publishable' }, async (req, ctx) => {
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    const params = new URL(req.url).searchParams
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    const input = params.get('input')
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    const output = await model.run(input, { mean_pool: true, normalize: true })
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    return Response.json(output)
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  }),
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}

Using Large Language Models (LLM)#

Inference via larger models is supported via Ollama and Mozilla Llamafile. In the first iteration, you can use it with a self-managed Ollama or Llamafile server.

Running locally#

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Install Ollama

Install Ollama and pull the Mistral model

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ollama pull mistral
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Run the Ollama server

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ollama serve
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Set the function secret

Set a function secret called AI_INFERENCE_API_HOST to point to the Ollama server

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echo "AI_INFERENCE_API_HOST=http://host.docker.internal:11434" >> supabase/functions/.env
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Create a new function

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supabase functions new ollama-test
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import 'jsr:@supabase/functions-js/edge-runtime.d.ts'
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import { withSupabase } from 'npm:@supabase/server@^1'
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const session = new Supabase.ai.Session('mistral')
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export default {
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  fetch: withSupabase({ auth: 'publishable' }, async (req, ctx) => {
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    const params = new URL(req.url).searchParams
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    const prompt = params.get('prompt') ?? ''
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    // Get the output as a stream
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    const output = await session.run(prompt, { stream: true })
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    const headers = new Headers({
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      'Content-Type': 'text/event-stream',
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      Connection: 'keep-alive',
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    })
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    // Create a stream
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    const stream = new ReadableStream({
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      async start(controller) {
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        const encoder = new TextEncoder()
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        try {
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          for await (const chunk of output) {
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            controller.enqueue(encoder.encode(chunk.response ?? ''))
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          }
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        } catch (err) {
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          console.error('Stream error:', err)
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        } finally {
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          controller.close()
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        }
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      },
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    })
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    // Return the stream to the user
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    return new Response(stream, {
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      headers,
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    })
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  }),
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}
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Serve the function

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supabase functions serve --no-verify-jwt --env-file supabase/functions/.env
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Execute the function

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curl --get "http://localhost:54321/functions/v1/ollama-test" \
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--data-urlencode "prompt=write a short rap song about Supabase, the Postgres Developer platform, as sung by Nicki Minaj" \
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-H "apikey: $PUBLISHABLE_KEY"

Deploying to production#

Once the function is working locally, it's time to deploy to production.

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Deploy an Ollama or Llamafile server

Deploy an Ollama or Llamafile server and set a function secret called AI_INFERENCE_API_HOST to point to the deployed server:

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supabase secrets set AI_INFERENCE_API_HOST=https://path-to-your-llm-server/
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Deploy the function

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supabase functions deploy --no-verify-jwt
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Execute the function

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curl --get "https://project-ref.supabase.co/functions/v1/ollama-test" \
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--data-urlencode "prompt=write a short rap song about Supabase, the Postgres Developer platform, as sung by Nicki Minaj" \
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-H "apikey: $PUBLISHABLE_KEY"