Better Auth Core (TypeScript) Goals Set up a Better Auth instance with environment variables and data layer wiring. Wire server handlers and a client instance. Use sessions and server-side API methods safely. Keep data-layer choices pluggable (drivers or adapters). Quick start Install better-auth . Set BETTER_AUTH_SECRET (32+ chars) and BETTER_AUTH_URL . Create auth.ts and export auth . Provide database (driver or adapter) or omit for stateless sessions. Mount a handler ( auth.handler or a framework helper). Create a client with createAuthClient . import { betterAuth } from "better-auth" ; export const auth = betterAuth ( { database : myDatabaseOrAdapter , // driver or adapter; omit for stateless mode emailAndPassword : { enabled : true } , socialProviders : { github : { clientId : process . env . GITHUB_CLIENT_ID as string , clientSecret : process . env . GITHUB_CLIENT_SECRET as string , } , } , } ) ; Core setup checklist Export the instance as auth (or default export) so helpers find it. Keep BETTER_AUTH_URL in sync with the public base URL. Pass the full base URL to the client if you change the /api/auth base path. Add database migrations before enabling plugins that require tables. Server API usage Call server endpoints via auth.api.* with { body, headers, query } . Use asResponse: true if you need a Response object. Use returnHeaders: true to access Set-Cookie headers. import { auth } from "./auth" ; const session = await auth . api . getSession ( { headers : request . headers , } ) ; const response = await auth . api . signInEmail ( { body : { email , password } , asResponse : true , } ) ; Session access Client: authClient.useSession() or authClient.getSession() . Server: auth.api.getSession({ headers }) . TypeScript tips Infer types with auth.$Infer and authClient.$Infer . Use inferAdditionalFields on the client when you extend the user schema. References toolchains/platforms/auth/better-auth/better-auth-core/references/setup-database.md toolchains/platforms/auth/better-auth/better-auth-core/references/client-server.md toolchains/platforms/auth/better-auth/better-auth-core/references/typescript.md

安装