Integrate Lucia Auth with Zustand

The complete guide to connecting Lucia Auth and Zustand in Next.js 15.

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Lucia Auth + Zustand
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Pre-configured Lucia Auth & Zustand SDKs.

Secure Webhook & API Handlers (with error logging).

Responsive UI Components styled with Tailwind (Dark).

Optimized for Next.js 15 & TypeScript.

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Technical Proof & Alternatives

Verified open-source examples and architecture guides for this stack.

AI Architecture Guide

This blueprint outlines a robust integration between Next.js 15 (utilizing React 19 features) and a distributed service layer (Supabase v3.1 + Vercel AI SDK v4.2). It leverages the stable 'use cache' directive, Server Actions for mutations, and Edge-compatible streaming for real-time AI responses, ensuring 2026-standard type safety and performance.

lib/integration.ts

1import { streamText } from 'ai';
2import { openai } from '@ai-sdk/openai';
3import { createClient } from '@supabase/supabase-js';
4
5// Next.js 15 Server Action with AI Streaming
6export async function generateAIAssistance(prompt: string) {
7  const supabase = createClient(
8    process.env.SUPABASE_URL!,
9    process.env.SUPABASE_SERVICE_ROLE_KEY!
10  );
11
12  const { data: profile } = await supabase
13    .from('profiles')
14    .select('preferences')
15    .single();
16
17  const result = await streamText({
18    model: openai('gpt-5-turbo'), // 2026 Stable Release
19    system: `Adjust response for user: ${JSON.stringify(profile?.preferences)}`,
20    prompt,
21  });
22
23  return result.toDataStreamResponse();
24}

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