API Reference

SDK Reference

This page lists every public import in the SDK, with its signature and return type. For setup and examples, start with the guides.

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API topics

Topic	Use it for
Plugin and configuration	Add the SDK to Vite and configure your app.
Handlers and middleware	HTTP routes, validation, scheduled jobs, queues, and rendering.
Rewrites	Serve another route while keeping the requested URL.
Authentication	Sessions, users, and the auth client.
Fetch client	Typed requests and errors.
Durable State and WebSockets	Persistent objects and typed connections.
Database and seeding	Queries, operators, and seed scripts.
KV, storage, AI, and logging	Resource clients, cache revalidation, and logs.
Deployment artifacts	Package built apps for managed deployment.
Types	Handler context, route types, and head metadata.
Environment variables	Validated environment values and binding types.
Pages adapters	React, Vue, Svelte, Solid, and Markdown.

User-Facing Imports

Import the SDK's app APIs from these paths:

Import path	Contents
void	voidPlugin, handler/type re-exports, defer, Deferred, DeferredState, InferProps, HeadDescriptor
void/handler	defineHandler, defineMiddleware, basicAuth, defineScheduled, defineQueue, defineRender, defineHead, types
void/auth	defineAuth, getUser, getSession, requireAuth, AuthUser, AuthSession, AuthState
void/client	fetch, fetchStream, FetchError, auth, createAuthClient, AuthUser, AuthSession, AuthState
void/client/{framework}	Same as void/client, with framework-specific Better Auth clients for react, vue, svelte, and solid
void/ws	defineRoom, defineWebSocket, connect, WebSocket context and connection types
void/durable	defineDurableState, defineDurableObject, typed state/RPC/context/migration types
void/sse	eventStream, formatSse, formatSseText, getLastEventId, SseStreamClosedError, SSE message and stream types
void/sse/client	connectEventStream, browser EventSource wrapper types
void/live	defineLiveStream, SSE topic fanout runtime types. Server-only.
void/live/client	connectLiveStream, browser helper for one SSE connection plus POST subscribe/unsubscribe control.
void/response	convertReturnValue
void/validator	runValidation, ValidatorSlots, HandlerInput
void/drizzle-zod	Re-exports drizzle-zod for schema-derived Zod validators for Drizzle tables
void/drizzle-valibot	Re-exports drizzle-valibot for schema-derived Valibot validators for Drizzle tables
void/drizzle-arktype	Re-exports drizzle-arktype for schema-derived ArkType validators for Drizzle tables
void/schema-d1	Re-exports drizzle-orm/sqlite-core for D1 table and column builders
void/schema-pg	Re-exports drizzle-orm/pg-core for PostgreSQL table and column builders
void/schema-mysql	Re-exports drizzle-orm/mysql-core for MySQL table and column builders
void/database-provider	defineDatabaseProvider and adapter types for void db connect --provider
void/db	db (Drizzle D1, PostgreSQL, or MySQL instance for the active dialect), createDb, query operators (eq, and, or, desc, like, inArray, etc.)
void/seed	defineSeed, SeedContext, SeedFn for programmatic void db seed modules
void/kv	kv, createKV, typed KV client/map types
void/storage	storage, createStorage for the inferred R2 binding or a specific R2Bucket
void/ai	ai, VoidAi, model input and response types
void/limits	UsageLimit, UsageLimitData, and readUsageLimit. AI and Sandbox limits reject with UsageLimit; uncaught limits in SDK routes and Pages actions return structured HTTP 429 responses.
void/isr	revalidate(options) for on-demand ISR cache invalidation
void/log	logger structured logging helper
void/routes	RouteMap and WebSocketRouteMap stubs (types only)
void/queues	queues proxy for sending messages to typed queues
void/email	sendEmail, createEmail, defineEmail, parseEmail, replyEmail, MimeError, ParseEmailError, and address, attachment, result, and handler types. See Email.
void/email/testing	createEmailTestHarness and createInboundTestHarness to capture sends and deliver test messages to email/ handlers.
void/sandbox	getSandbox, sandbox, SandboxLimitError, SandboxUnavailableError, and the SDK 1.0 file, backup, and mount helpers. getSandbox(id) resolves a client. Commands, files, port requests, and process completion return promises; limits reject with SandboxLimitError, which extends UsageLimit. Container state lasts until inactivity (default ten minutes), a crash, or a restart. See Sandboxes for the API and deployment requirements.
void/env	defineEnv, env, schema helpers (string, number, boolean, url, email, oneOf, json), and global Cloudflare env types
void/nitro	Nitro module for Nuxt and Analog. Add 'void/nitro' to the Nitro modules so server routes get the app's void/db and @schema
void/sveltekit	SvelteKit integration helpers: withVoidTSConfig() and mergeVoidSvelteKitTsconfig()

Next steps

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