Serve nextjs static html build inside nestjs public folder

import { NestFactory } from '@nestjs/core';

import { AppModule } from './app.module';

import { ConfigService } from '@nestjs/config';

import * as path from 'path';

import * as express from 'express';

async function bootstrap() {

const app = await NestFactory.create(AppModule, { rawBody: true });

const appConfig = app.get(ConfigService);

const port = appConfig.get<number>('app.port')!;

const apiPrefix = appConfig.get('app.apiPrefix');

// Serve Next.js static app from root (only for non-API routes) (public/app)

const frontendPath = path.join(process.cwd(), 'public', 'app');

app.use((req: express.Request, res: express.Response, next: express.NextFunction) => {

// Skip if it's an API route, public route, or Swagger docs

if (req.path.startsWith(`/${apiPrefix}`) || req.path.startsWith('/public')) {

return next();

}

// Try to serve static file first

express.static(frontendPath)(req, res, (err) => {

if (err) {

return next(err);

}

// If no static file found, serve index.html for SPA routing

const indexPath = path.join(frontendPath, 'index.html');

if (require('fs').existsSync(indexPath)) {

res.sendFile(indexPath);

} else {

res.status(404).send('Frontend app not found. Please build and deploy the Next.js app first.');

}

});

});

await app.listen(port);

console.log(`Application running on: http://localhost:${port}`);

console.log(`Swagger UI: http://localhost:${port}/api/docs`);

}

bootstrap();