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Showing content from https://docs.sentry.io/platforms/javascript/guides/aws-lambda/install/layer below:

Lambda Layer | Sentry for AWS Lambda

The easiest way to get started with Sentry is to use the Sentry Lambda Layer instead of installing @sentry/aws-serverless with a package manager manually. If you follow this guide, you don't have to worry about deploying Sentry dependencies alongside your function code.

Before you begin, make sure you have the following:

• You have a Lambda function deployed in AWS.
• You know the AWS region that your function is deployed to.

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.

Choose your setup method based on your Lambda function type:

The setup instructions you should follow depend on how your function runs at runtime, not how it's written in your source code.

• Use CommonJS instructions if your function runs with CommonJS modules (uses require() and module.exports at runtime)
• Use ESM instructions if your function runs with ES modules (uses import/export at runtime)

Important: Even if you write your code with import/export syntax, your function might still run as CommonJS if you're using TypeScript or a build tool that compiles to CommonJS. Check your build output or Lambda runtime configuration to determine which applies to your function.

CommonJS functions support fully automatic setup using environment variables - both SDK initialization and handler wrapping are handled automatically.

ESM functions support automatic SDK initialization via environment variables, but require manual handler wrapping.

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.

Error Monitoring Tracing

Set the following environment variables in your Lambda function configuration:

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NODE_OPTIONS="--require @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:

You'll also need to manually wrap your handler as shown below:

index.mjs

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import * as Sentry from "@sentry/aws-serverless";

export const handler = Sentry.wrapHandler(async (event, context) => {
  
});

Instead of using environment variables, you can manually initialize the SDK and wrap your handler in code. This approach works for both CommonJS and ESM functions and allows for further customization of the SDK setup.

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.

index.js

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

Sentry.init({
  dsn: "https://examplePublicKey@o0.ingest.sentry.io/0",

  
  
  sendDefaultPii: true,
  

  
  
  
  
  
  tracesSampleRate: 1.0,
  
});



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

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. Make sure that the Sentry.init call and the import statement are at the very top of your file before any other imports.

First, wrap your handler:

index.mjs

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import * as Sentry from "@sentry/aws-serverless";

export const handler = Sentry.wrapHandler(async (event, context) => {
  
});

Due to ESM limitations, you need to initialize the SDK in a separate file and load it before your function starts.

Create a new file, for example instrument.mjs to initialize the SDK:

instrument.mjs

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import * as Sentry from "@sentry/aws-serverless";

Sentry.init({
  dsn: "https://examplePublicKey@o0.ingest.sentry.io/0",

  
  
  sendDefaultPii: true,
  

  
  
  
  
  
  tracesSampleRate: 1.0,
  
});

To load the SDK before your function starts, you need to preload the instrument.mjs by setting the NODE_OPTIONS environment variable:

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NODE_OPTIONS="--import ./instrument.mjs"

That's it — make sure to re-deploy your function and you're all set!

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