Integrate LangChain with React Query

The complete guide to connecting LangChain and React Query in Next.js 15.

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LangChain + React Query
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Pre-configured LangChain & React Query SDKs.

Secure Webhook & API Handlers (with error logging).

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Optimized for Next.js 15 & TypeScript.

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Technical Proof & Alternatives

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AI Architecture Guide

This blueprint establishes a robust, type-safe connection between Next.js 15 (App Router) and a PostgreSQL persistence layer using Prisma ORM. It leverages React Server Components (RSC) and Server Actions to eliminate the need for traditional REST/gRPC boilerplate, ensuring a direct-to-database execution model while maintaining strict security boundaries via environment isolation and Zod-based schema validation.

lib/integration.ts

1import { PrismaClient } from '@prisma/client/edge';
2import { withAccelerate } from '@prisma/extension-accelerate';
3
4// 1. Singleton pattern for the Database Client (next-db-connection.ts)
5const prismaClientSingleton = () => {
6  return new PrismaClient().$extends(withAccelerate());
7};
8
9declare global {
10  var prisma: undefined | ReturnType<typeof prismaClientSingleton>;
11}
12
13const db = globalThis.prisma ?? prismaClientSingleton();
14export default db;
15
16if (process.env.NODE_ENV !== 'production') globalThis.prisma = db;
17
18// 2. Next.js 15 Server Action (actions.ts)
19'use server';
20
21import { z } from 'zod';
22import { revalidatePath } from 'next/cache';
23
24const Schema = z.object({ 
25  email: z.string().email(),
26  payload: z.record(z.any())
27});
28
29export async function syncRecord(formData: FormData) {
30  const validated = Schema.safeParse(Object.fromEntries(formData.entries()));
31  
32  if (!validated.success) return { error: 'Invalid Structure' };
33
34  try {
35    const result = await db.record.upsert({
36      where: { email: validated.data.email },
37      update: { data: validated.data.payload },
38      create: { email: validated.data.email, data: validated.data.payload },
39    });
40    
41    revalidatePath('/dashboard');
42    return { success: true, id: result.id };
43  } catch (e) {
44    console.error('Connection_Failure', e);
45    throw new Error('Database Synchronization Failed');
46  }
47}

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