How do you handle raw body access for webhook signature verification in NestJS?

Q: How do you handle raw body access for webhook signature verification in NestJS?

// main.ts — enable raw body preservation const app = await NestFactory.create(AppModule, { rawBody: true }); // Controller — access both raw buffer and parsed body import { RawBody } from '@nestjs/common'; @Post('webhook') handleWebhook( @RawBody() rawBody: Buffer, // original bytes for HMAC verification @Body() event: StripeWebhookDto, // parsed JSON for business logic @Headers('stripe-signature') sig: string, ) { const isValid = this.stripeService.verifySignature(rawBody, sig); if (!isValid) throw new UnauthorizedException('Invalid signature'); return this.stripeService.handleEvent(event); } rawBody: true in NestFactory.create() preserves the original Buffer before JSON parsing. @RawBody() injects the Buffer — pass it directly to HMAC verification functions like crypto.timingSafeEqual. Without rawBody: true the body is parsed and the original bytes are lost — signature verification fails. The alternative is configuring Express body-parser verify callback before NestJS boots — rawBody: true is cleaner. Use @Headers('stripe-signature') or equivalent to extract the provider's signature header.

Difficulty: 5/10

raw body parsing, webhook signature verification, NestJS middleware

Enable rawBody: true in NestFactory.create() options. NestJS will then preserve the raw Buffer alongside the parsed body. Use @RawBody() to inject the buffer for HMAC signature verification while still receiving the parsed DTO via @Body() for business logic.

Raw body access for webhook signature verification

Webhook verification implementation notes:

1
rawBody: true in NestFactory.create() preserves the original Buffer before JSON parsing.
2
@RawBody() injects the Buffer — pass it directly to HMAC verification functions like crypto.timingSafeEqual.
3

How do you handle raw body access for webhook signature verification in NestJS?

Difficulty: 5/10

raw body parsing, webhook signature verification, NestJS middleware

Enable rawBody: true in NestFactory.create() options. NestJS will then preserve the raw Buffer alongside the parsed body. Use @RawBody() to inject the buffer for HMAC signature verification while still receiving the parsed DTO via @Body() for business logic.

Raw body access for webhook signature verification

Webhook verification implementation notes:

1
rawBody: true in NestFactory.create() preserves the original Buffer before JSON parsing.
2
@RawBody() injects the Buffer — pass it directly to HMAC verification functions like crypto.timingSafeEqual.
3

How do you handle raw body access for webhook signature verification in NestJS?

Enable rawBody: true in NestFactory.create() options. NestJS will then preserve the raw Buffer alongside the parsed body. Use @RawBody() to inject the buffer for HMAC signature verification while still receiving the parsed DTO via @Body() for business logic.

How do you handle raw body access for webhook signature verification in NestJS?

Enable rawBody: true in NestFactory.create() options. NestJS will then preserve the raw Buffer alongside the parsed body. Use @RawBody() to inject the buffer for HMAC signature verification while still receiving the parsed DTO via @Body() for business logic.

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