You can use Turso alongside a Supabase application, but treat them as two independent data services—not as a built-in database connection. Supabase’s client handles Supabase Auth and Supabase’s Postgres-backed APIs; the Turso SDK handles queries to Turso. For requests that need both, authenticate with Supabase, then authorize and query Turso in trusted server-side code.
What “connecting” Turso to Supabase means
Supabase’s platform services are built around the project’s Postgres database. Supabase Auth stores authentication information in that database’s auth schema. Turso is a separate database accessed by application code through Turso’s own SDK and credentials. The official documentation describes the two services separately; it does not establish a native Supabase-to-Turso database replacement or automatic direct integration.
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Choose which system owns each kind of data, then use the corresponding client for every query. For example, your app can use Supabase Auth for sign-in and Supabase’s client for Postgres-backed application data, while using the Turso client for records deliberately assigned to Turso. The separation is architectural: Supabase does not become the driver for Turso.
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1. Configure Turso on the server
Create or identify a Turso database, then obtain its database URL and authentication token using the current instructions in Turso’s TypeScript SDK quickstart. Turso’s documented configuration names are TURSO_DATABASE_URL and TURSO_AUTH_TOKEN. Put both values in server-side environment configuration or your hosting platform’s secret store. Do not include the token in browser code or any bundle sent to users.
Install the TypeScript SDK using the package and commands in that quickstart, and initialize its client with the server-held URL and token. Use this client for Turso queries. Check the quickstart for current package instructions rather than relying on copied commands that may have changed.
2. Configure Supabase for its own services
Initialize the Supabase client separately with your project URL and a publishable key for frontend Data API access. Use it for Supabase Auth and Supabase APIs; it is not a Turso driver. Supabase’s guidance for frontend access is to use a publishable key with Row Level Security (RLS) enabled and least-privilege policies. Keep secret and service-role keys on the backend because they bypass RLS. See Supabase’s API key guidance.
3. Route combined requests through trusted code
If a request needs both a Supabase identity and Turso data, put the Turso query behind a trusted server route or function. That server-side boundary keeps Turso credentials private and gives your application a place to verify the caller and decide whether they may read or change the requested Turso records.
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Before treating an example as deployable, confirm that the specific Turso SDK version works in your chosen Supabase runtime and hosting target. The official pages cited here do not establish compatibility for every runtime or deployment configuration.
Make the identity and authorization boundary explicit
A successful Supabase sign-in does not automatically apply Supabase Postgres RLS policies to Turso rows. Supabase Auth identifies the user; your trusted application code must separately authorize the requested action against the Turso data before querying or changing it.
- Authenticate: use Supabase Auth to establish the caller’s identity.
- Authorize: in trusted server-side code, check that this user may access the relevant Turso record or operation.
- Query: use the Turso SDK and server-held credentials to perform the allowed operation.
- Return only permitted data: send the authorized result to the caller, not the Turso credentials.
Supabase documents triggers and foreign keys as ways to connect Auth information to objects within its own Postgres database. Those mechanisms do not automatically span from Supabase Postgres into Turso; any mapping between a Supabase user and Turso records is an application-level decision. See Supabase’s user-data management guidance.
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| Approach | Data ownership and query client | Where authorization happens | Credential handling |
|---|---|---|---|
| Keep data in Supabase Postgres | Supabase owns the tables; use the Supabase client and APIs. | Use Supabase Auth and appropriate RLS policies for Data API access. | Frontend access uses a publishable key with RLS and least-privilege policies; secret and service-role keys remain backend-only. |
| Use Turso for selected data | Turso owns those records; use the Turso SDK for queries. | Check identity and application authorization in trusted server-side code before accessing the records. | Keep the Turso database URL and token in server-side configuration or a hosting secret store. |
| Use both for one application request | Each service owns its assigned data; use each service’s client for its own queries. | Authenticate with Supabase, then have trusted application code make and enforce the authorization decision for Turso. | Keep Turso credentials and Supabase secret or service-role keys on the backend; use only the Supabase publishable key for appropriately protected frontend Data API access. |
The cited official documentation does not provide a benchmark or pricing comparison for this combined architecture. Choose based on data ownership, authorization requirements, deployment compatibility, and how you will provision and protect each service’s credentials—not on an unsupported assumption about cost, speed, or performance.
Quick Recap
Check before deploying
- Every table or record type has a clearly assigned owner: Supabase Postgres or Turso.
- Supabase queries use the Supabase client, and Turso queries use the Turso SDK.
- The Turso URL and token are stored as server secrets and are never exposed to browser code.
- Supabase frontend Data API access uses a publishable key with RLS enabled and least-privilege policies; secret and service-role keys are not shipped to clients.
- Every Turso operation checks the authenticated user and application authorization in trusted code; Supabase RLS alone does not protect Turso data.
- The SDK and the selected deployment runtime have been verified together for your target environment.
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