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シリーズ: nest.js typescript 37 行 · 更新日 2026-02-03

transform.interceptor.ts

nest.js/03-advanced/code/common/interceptors/transform.interceptor.ts

import {
  Injectable,
  NestInterceptor,
  ExecutionContext,
  CallHandler,
} from '@nestjs/common';
import { Observable } from 'rxjs';
import { map } from 'rxjs/operators';

export interface Response<T> {
  success: boolean;
  data: T;
  timestamp: string;
  path: string;
}

@Injectable()
export class TransformInterceptor<T>
  implements NestInterceptor<T, Response<T>>
{
  intercept(
    context: ExecutionContext,
    next: CallHandler,
  ): Observable<Response<T>> {
    const request = context.switchToHttp().getRequest();

    return next.handle().pipe(
      map((data) => ({
        success: true,
        data,
        timestamp: new Date().toISOString(),
        path: request.url,
      })),
    );
  }
}
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