Lambda Layer - CJS

The easiest way to get started with Sentry is to use the Sentry Lambda Layer instead of adding @sentry/aws-serverless with npm or yarn manually. If you follow this guide, you don't have to worry about deploying Sentry dependencies alongside your function code. To actually start the SDK, you can decide between setting up the SDK using environment variables or in your Lambda function code. We recommend using environment variables as it's the easiest way to get started. Initializing the SDK in code instead of setting environment variables gives you more control over the SDK setup if you need it.

1. Prerequisites

Before you begin, make sure you have the following:

• You have a Lambda function that is running in CommonJS (CJS) mode, using require syntax.
• You know the AWS region that your function is deployed to.

2. Add the Sentry Lambda Layer

Add the Sentry Layer by navigating to your Lambda function. Select Layers, then Add a Layer.

Specify an ARN tab as illustrated:

Finally, set the region and copy the provided ARN value into the input.

3. Initialize the SDK with Environment Variables

The easiest way to set up the SDK is to start and configure it using environment variables. This way, you don't have to modify your Lambda function code.

In addition to capturing errors, you can monitor interactions between multiple services or applications by enabling tracing.

Select which Sentry features you'd like to install in addition to Error Monitoring to get the corresponding installation and configuration instructions below.

Set the following environment variables in your Lambda function configuration:

NODE_OPTIONS="-r @sentry/aws-serverless/awslambda-auto"
SENTRY_DSN="https://examplePublicKey@o0.ingest.sentry.io/0"
SENTRY_TRACES_SAMPLE_RATE="1.0"

To set environment variables, navigate to your Lambda function, select Configuration, then Environment variables:

Alternative: Initialize the SDK in Code

Instead of Step 3, setting environment variables, you can also manually initialize the SDK in your Lambda function code. This way, you can customize the SDK setup further. Note that you don't have to actually install an NPM package for this to work, as the package is already included in the Lambda Layer.

Make sure you completed step 1 and step 2 before proceeding.

const Sentry = require("@sentry/aws-serverless");

Sentry.init({
  dsn: "https://examplePublicKey@o0.ingest.sentry.io/0",
  // Add Tracing by setting tracesSampleRate and adding integration
  // Set tracesSampleRate to 1.0 to capture 100% of transactions
  // We recommend adjusting this value in production
  tracesSampleRate: 1.0,
});

exports.handler = Sentry.wrapHandler(async (event, context) => {
  // Your handler code
});

It's important to add both, the Sentry.init call outside the handler function and the Sentry.wrapHandler wrapper around your function to automatically catch errors and performance data.

That's it - you're all set!

Lambda layer for v7 SDK

The instructions above are written for SDK version 8 (the most recent version). You can also install a v7 version of the Sentry Lambda layer in case you can't upgrade to v8. The procedure is identical to the instructions above except for two differences:

v7 layer ARN

The v7 Lambda layer has a different ARN:

arn:aws:Lambda:us-west-1:943013980633:layer:SentryNodeServerlessSDKv7:3

Modify and copy the ARN value for your region into the input, e.g. for region :us-west-1 and the current v7 Lambda layer version :3:

v7 package name

The @sentry/aws-serverless package was called @sentry/serverless prior to version 8. Therefore, for the v7 layer, adjust your NODE_OPTIONS environment variable:

NODE_OPTIONS="-r @sentry/serverless/dist/awslambda-auto"

The other environment variables remain the same as above.