Connect to SurrealDB

⭐ Community Toolkit

This page describes how consuming apps connect to a SurrealDB resource that’s already modeled in your AppHost. For the AppHost API surface — adding a SurrealDB server, namespace, database, Surrealist, data bind mounts, and more — see SurrealDB Hosting integration.

When you reference a SurrealDB resource from your AppHost, Aspire injects the connection information into the consuming app as environment variables. Your app can either read those environment variables directly — the pattern works the same from any language — or, in C#, use the Aspire SurrealDB client integration for automatic dependency injection, health checks, and telemetry.

Connection properties

Aspire exposes each property as an environment variable named [RESOURCE]_[PROPERTY]. For instance, the Endpoint property of a resource called db becomes DB_ENDPOINT.

The SurrealDB database resource exposes the following connection properties:

Property Name	Description
Host	The hostname or IP address of the SurrealDB server
Port	The HTTP/WebSocket port the SurrealDB server is listening on (default: 8000)
Username	The username for authentication
Password	The password for authentication
Namespace	The SurrealDB namespace name
Database	The database name
Endpoint	The full WebSocket endpoint URL, with the format ws://{Host}:{Port}/
ConnectionString	The full connection string, with the format Endpoint=ws://{Host}:{Port}/;Namespace={Namespace};Database={Database};Username={Username};Password={Password}

Example connection string:

ConnectionString: Endpoint=ws://localhost:8000/;Namespace=ns;Database=db;Username=root;Password=p%40ssw0rd1

Connect from your app

Pick the language your consuming app is written in. Each example assumes your AppHost adds a SurrealDB server, namespace, and database resource with the database named db and references it from the consuming app.

C#

For C# apps, the recommended approach is the Aspire SurrealDB client integration. It registers a SurrealDbClient through dependency injection and adds health checks and telemetry automatically. If you’d rather read environment variables directly, see the Read environment variables section at the end of this tab.

Install the client integration

Install the 📦 CommunityToolkit.Aspire.SurrealDb NuGet package in the client-consuming project:

.NET CLI

.NET CLI — Add CommunityToolkit.Aspire.SurrealDb package

dotnet add package CommunityToolkit.Aspire.SurrealDb

Program.cs (C# file-based app)

Program.cs

#:package CommunityToolkit.Aspire.SurrealDb@*

PackageReference (*.csproj)

XML — Add CommunityToolkit.Aspire.SurrealDb package reference

<PackageReference Include="CommunityToolkit.Aspire.SurrealDb" Version="*" />

Add the SurrealDB client

In Program.cs, call AddSurrealClient on your IHostApplicationBuilder to register a SurrealDbClient:

C# — Program.cs

builder.AddSurrealClient(connectionName: "db");

ヒント

The connectionName must match the SurrealDB database resource name from the AppHost. For more information, see Add SurrealDB resource.

Resolve the client through dependency injection:

C# — ExampleService.cs

public class ExampleService(SurrealDbClient client)
{
    // Use client...
}

Add keyed SurrealDB clients

To register multiple SurrealDbClient instances with different connection names, use AddKeyedSurrealClient:

C# — Program.cs

builder.AddKeyedSurrealClient(name: "products");
builder.AddKeyedSurrealClient(name: "orders");

Then resolve each instance by key:

C# — ExampleService.cs

public class ExampleService(
    [FromKeyedServices("products")] SurrealDbClient productsClient,
    [FromKeyedServices("orders")] SurrealDbClient ordersClient)
{
    // Use clients...
}

For more information on keyed services, see .NET dependency injection: Keyed services.

Configuration

The Aspire SurrealDB client integration offers multiple ways to provide configuration.

Connection strings. When using a connection string from the ConnectionStrings configuration section, pass the connection name to AddSurrealClient:

C# — Program.cs

builder.AddSurrealClient("db");

The connection string is resolved from the ConnectionStrings section:

JSON — appsettings.json

{
  "ConnectionStrings": {
    "db": "Endpoint=ws://localhost:8000/;Namespace=ns;Database=db;Username=root;Password=s3cr3t"
  }
}

Configuration providers. The client integration supports Microsoft.Extensions.Configuration. It loads settings from appsettings.json (or any other configuration source) by using the Aspire:Surreal:Client key:

JSON — appsettings.json

{
  "Aspire": {
    "Surreal": {
      "Client": {
        "Endpoint": "ws://localhost:8000/",
        "Namespace": "ns",
        "Database": "db",
        "Username": "root",
        "Password": "s3cr3t"
      }
    }
  }
}

Inline delegates. Pass an action to configure settings inline, for example to disable health checks:

C# — Program.cs

builder.AddSurrealClient(
    "db",
    static settings => settings.DisableHealthChecks = true);

Client integration health checks

Aspire client integrations enable health checks by default. The SurrealDB client integration adds a health check that verifies the SurrealDB instance is reachable and can execute queries. The health check is wired into the /health HTTP endpoint, where all registered health checks must pass before the app is considered ready to accept traffic.

Read environment variables in C#

If you prefer not to use the Aspire client integration, you can read the Aspire-injected connection string from the environment and use the 📦 SurrealDB.Net NuGet package to construct a client directly:

C# — Program.cs

using SurrealDb.Net;

var connectionString = Environment.GetEnvironmentVariable("DB_CONNECTIONSTRING");

var client = new SurrealDbClient(connectionString!);
await client.Connect();

// Use client to query the database...

Go

Use the official SurrealDB Go driver:

Terminal

go get github.com/surrealdb/surrealdb.go

Read the injected environment variables and connect:

Go — main.go

package main

import (
    "fmt"
    "os"
    surrealdb "github.com/surrealdb/surrealdb.go"
)

func main() {
    // Read the Aspire-injected connection properties
    endpoint := os.Getenv("DB_ENDPOINT")
    namespace := os.Getenv("DB_NAMESPACE")
    database  := os.Getenv("DB_DATABASE")
    username  := os.Getenv("DB_USERNAME")
    password  := os.Getenv("DB_PASSWORD")

    db, err := surrealdb.New(endpoint)
    if err != nil {
        panic(err)
    }
    defer db.Close()

    if _, err = db.SignIn(&surrealdb.Auth{
        Namespace: namespace,
        Database:  database,
        Username:  username,
        Password:  password,
    }); err != nil {
        panic(err)
    }

    fmt.Println("Connected to SurrealDB")
    // Use db to query the database...
}

Python

Install the official SurrealDB Python package:

Terminal

pip install surrealdb

Read the injected environment variables and connect:

Python — app.py

import os
import asyncio
from surrealdb import AsyncSurrealDB

async def main():
    # Read the Aspire-injected connection properties
    endpoint  = os.getenv("DB_ENDPOINT")
    namespace = os.getenv("DB_NAMESPACE")
    database  = os.getenv("DB_DATABASE")
    username  = os.getenv("DB_USERNAME")
    password  = os.getenv("DB_PASSWORD")

    async with AsyncSurrealDB(url=endpoint) as db:
        await db.signin({"username": username, "password": password})
        await db.use(namespace, database)

        # Use db to query the database...

asyncio.run(main())

TypeScript

Install the official SurrealDB JavaScript/TypeScript package:

Terminal

npm install surrealdb

Read the injected environment variables and connect:

TypeScript — index.ts

import Surreal from 'surrealdb';

// Read Aspire-injected connection properties
const endpoint  = process.env.DB_ENDPOINT!;
const namespace = process.env.DB_NAMESPACE!;
const database  = process.env.DB_DATABASE!;
const username  = process.env.DB_USERNAME!;
const password  = process.env.DB_PASSWORD!;

const db = new Surreal();

await db.connect(endpoint);

await db.signin({ username, password });
await db.use({ namespace, database });

// Use db to query the database...

await db.close();

ヒント

If your app expects specific environment variable names different from the Aspire defaults, you can pass individual connection properties from the AppHost using WithEnvironment. See the Aspire AppHost documentation for details.