middleware correlation-id.middleware.ts

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  import { Injectable, NestMiddleware } from '@nestjs/common';
import { Request, Response, NextFunction } from 'express';
import { randomUUID } from 'crypto';
 
@Injectable()
export class CorrelationIdMiddleware implements NestMiddleware {
  use(req: Request, res: Response, next: NextFunction): void {
    const correlationId =
      (req.headers['x-correlation-id'] as string) || randomUUID();
    const requestId = randomUUID();
 
    const requestAny = req as any;
    requestAny.correlationId = correlationId;
    requestAny.requestId = requestId;
 
    res.setHeader('x-correlation-id', correlationId);
    res.setHeader('x-request-id', requestId);
 
    next();
  }
}