# Better Auth Integrations

> Better Auth framework integrations for TypeScript. Use when wiring route handlers in Next.js, SvelteKit, Remix, Express, Hono, or other web frameworks. Use when this capability is needed.

- Skill: `tomevault-io/better-auth-integrations` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add tomevault-io/better-auth-integrations`
- Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/better-auth-integrations/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Web & Frontend
- Author: tomevault-io (https://skillmd.com/u/tomevault-io)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/tomevault-io/better-auth-integrations

---

# Better Auth Integrations

## Goals
- Mount the Better Auth handler at `/api/auth/*` (or a custom base path).
- Use framework helpers where available.
- Ensure cookies and headers flow correctly in SSR and server actions.

## Quick start
1. Create an `auth` instance (see `better-auth-core`).
2. Add a catch-all route for `/api/auth/*`.
3. Use a framework helper (or `auth.handler`) to return a Response.

### Next.js App Router
```ts
import { auth } from "@/lib/auth";
import { toNextJsHandler } from "better-auth/next-js";

export const { GET, POST } = toNextJsHandler(auth);
```

### Next.js Pages Router
```ts
import { auth } from "@/lib/auth";
import { toNodeHandler } from "better-auth/node";

export const config = { api: { bodyParser: false } };
export default toNodeHandler(auth.handler);
```

## Cookie handling in Next.js server actions
Use the `nextCookies` plugin so server actions set cookies correctly.

```ts
import { betterAuth } from "better-auth";
import { nextCookies } from "better-auth/next-js";

export const auth = betterAuth({
  // ...config
  plugins: [nextCookies()],
});
```

## Guardrails
- Keep the base path consistent between server and client.
- Prefer framework helpers when available.
- Avoid running custom body parsers before the auth handler.

## References
- `toolchains/platforms/auth/better-auth/better-auth-integrations/references/nextjs.md`
- `toolchains/platforms/auth/better-auth/better-auth-integrations/references/frameworks.md`

---
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<!-- tomevault:4.0:skill_md:2026-04-11 -->