diff --git a/packages/services/service-datasource/src/__tests__/admin-routes.test.ts b/packages/services/service-datasource/src/__tests__/admin-routes.test.ts
index fafa8c3a6f..bef2045582 100644
--- a/packages/services/service-datasource/src/__tests__/admin-routes.test.ts
+++ b/packages/services/service-datasource/src/__tests__/admin-routes.test.ts
@@ -42,6 +42,18 @@ describe('registerDatasourceAdminRoutes (real HonoHttpServer)', () => {
     expect(listDatasources).toHaveBeenCalledOnce();
   });
 
+  it('GET /api/v1/datasources/drivers returns the driver catalog with configSchema', async () => {
+    const app = mount({}); // no service dependency — static catalog
+    const res = await app.fetch(json('/api/v1/datasources/drivers'));
+    expect(res.status).toBe(200);
+    const body = (await res.json()) as { drivers: Array<{ id: string; label: string; configSchema: any }> };
+    expect(Array.isArray(body.drivers)).toBe(true);
+    const sqlite = body.drivers.find((d) => d.id === 'sqlite');
+    expect(sqlite).toBeTruthy();
+    expect(sqlite!.label).toBe('SQLite');
+    expect(sqlite!.configSchema?.properties?.filename?.type).toBe('string');
+  });
+
   it('POST /api/v1/datasources/test splits the inline secret out of the draft', async () => {
     const testConnection = vi.fn().mockResolvedValue({ ok: true });
     const app = mount({ testConnection });
diff --git a/packages/services/service-datasource/src/admin-routes.ts b/packages/services/service-datasource/src/admin-routes.ts
index 8bac1551ec..f39225d75b 100644
--- a/packages/services/service-datasource/src/admin-routes.ts
+++ b/packages/services/service-datasource/src/admin-routes.ts
@@ -2,6 +2,7 @@
 
 import type { PluginContext } from '@objectstack/core';
 import type { IHttpServer } from '@objectstack/spec/contracts';
+import { DRIVER_CATALOG } from './driver-catalog.js';
 
 /**
  * Datasource lifecycle REST routes (ADR-0015 Addendum §3.5).
@@ -63,6 +64,13 @@ export function registerDatasourceAdminRoutes(
     res.json({ datasources });
   });
 
+  // Catalog of connection drivers + their JSON-Schema config (drives the
+  // Studio connection form). Static metadata — no service dependency, so it
+  // is always available even before any datasource-admin service is wired.
+  server.get(`${root}/drivers`, async (_req: any, res: any) => {
+    res.json({ drivers: DRIVER_CATALOG });
+  });
+
   // Probe a connection without persisting anything. Registered before the
   // `:name` routes so the literal `test` segment is never captured as a name.
   server.post(`${root}/test`, async (req: any, res: any) => {
diff --git a/packages/services/service-datasource/src/driver-catalog.ts b/packages/services/service-datasource/src/driver-catalog.ts
new file mode 100644
index 0000000000..0d275717fc
--- /dev/null
+++ b/packages/services/service-datasource/src/driver-catalog.ts
@@ -0,0 +1,113 @@
+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * Built-in datasource driver catalog.
+ *
+ * Each entry carries a JSON-Schema `configSchema` describing the driver's
+ * connection options, so the Studio UI can render a typed connection form
+ * instead of a raw-JSON editor (the `DriverDefinitionSchema.configSchema`
+ * contract — "Used by the UI to generate the connection form").
+ *
+ * Served by `GET /api/v1/datasources/drivers`. This is the curated set of
+ * connection drivers the connection form offers; a future runtime driver
+ * registry can supersede this list without changing the route contract.
+ */
+
+export interface DriverCatalogEntry {
+  /** Unique driver identifier used as `datasource.driver`. */
+  id: string;
+  /** Display label. */
+  label: string;
+  /** Optional one-line description. */
+  description?: string;
+  /** Optional Lucide icon name. */
+  icon?: string;
+  /** JSON Schema (draft-2020-12) for the driver's `config` object. */
+  configSchema: Record<string, unknown>;
+}
+
+const SSL_PROP = {
+  ssl: { type: 'boolean', title: 'Use SSL/TLS', default: false },
+} as const;
+
+export const DRIVER_CATALOG: DriverCatalogEntry[] = [
+  {
+    id: 'memory',
+    label: 'In-Memory',
+    description: 'Ephemeral in-memory driver for dev, tests, and prototyping. No connection settings.',
+    icon: 'memory-stick',
+    configSchema: { type: 'object', properties: {}, additionalProperties: false },
+  },
+  {
+    id: 'sqlite',
+    label: 'SQLite',
+    description: 'File-backed (or in-memory) SQL database. Great for local dev and small deployments.',
+    icon: 'database',
+    configSchema: {
+      type: 'object',
+      properties: {
+        filename: {
+          type: 'string',
+          title: 'Filename',
+          description: 'Database file path, or ":memory:" for an ephemeral in-memory database.',
+          default: ':memory:',
+        },
+      },
+      required: ['filename'],
+      additionalProperties: false,
+    },
+  },
+  {
+    id: 'postgres',
+    label: 'PostgreSQL',
+    description: 'PostgreSQL connection. Supply host/port/database or a connection URL.',
+    icon: 'database',
+    configSchema: {
+      type: 'object',
+      properties: {
+        url: { type: 'string', title: 'Connection URL', description: 'postgres://user:pass@host:5432/db (overrides the fields below when set).' },
+        host: { type: 'string', title: 'Host', default: 'localhost' },
+        port: { type: 'number', title: 'Port', default: 5432 },
+        database: { type: 'string', title: 'Database' },
+        username: { type: 'string', title: 'User' },
+        password: { type: 'string', title: 'Password', format: 'password' },
+        schema: { type: 'string', title: 'Schema', default: 'public' },
+        ...SSL_PROP,
+      },
+      additionalProperties: true,
+    },
+  },
+  {
+    id: 'mysql',
+    label: 'MySQL / MariaDB',
+    description: 'MySQL or MariaDB connection.',
+    icon: 'database',
+    configSchema: {
+      type: 'object',
+      properties: {
+        host: { type: 'string', title: 'Host', default: 'localhost' },
+        port: { type: 'number', title: 'Port', default: 3306 },
+        database: { type: 'string', title: 'Database' },
+        username: { type: 'string', title: 'User' },
+        password: { type: 'string', title: 'Password', format: 'password' },
+        ...SSL_PROP,
+      },
+      additionalProperties: true,
+    },
+  },
+  {
+    id: 'mongo',
+    label: 'MongoDB',
+    description: 'MongoDB connection via a connection URI.',
+    icon: 'database',
+    configSchema: {
+      type: 'object',
+      properties: {
+        url: { type: 'string', title: 'Connection URI', description: 'mongodb://host:27017' },
+        database: { type: 'string', title: 'Database' },
+      },
+      required: ['url'],
+      additionalProperties: true,
+    },
+  },
+];