How do I access the raw body of a Fastify request?

Question

As you may imagine, I'm familiar with Express, but this is the first time I'm using Fastify.

I'd like to access the unmodified body of a Fastify request, for signature verification of a webhook - ie, I would like to see the request as it came in, unmodified by any middleware. In Express this is often done by accessing request.rawBody.

How do I access the raw body of a Fastify request?

Answer 1

According to the docs https://docs.nestjs.com/faq/raw-body

in main.ts

  const app = await NestFactory.create<NestFastifyApplication>(
    AppModule,
    new FastifyAdapter(),
    {
      rawBody: true,
    },
  );

Then in your controller

  async handleStripeEvent(
    @Headers('stripe-signature') signature: string,
    @Req() request: RawBodyRequest<FastifyRequest>,
  ) {
    if (!signature) {
      throw new BadRequestException('Missing stripe-signature header');
    }

    const event = await this.webhooksService.handleStripePaymentWebhook(
      signature,
      request.rawBody,
    );
  }