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Using aws4

This example shows how to use AWS4 module.

aws4 module is imported as aws4

Call AWS Lambda function

// Set your AWS credentials
const accessKeyId = '<access key ID>';
const secretAccessKey = '<secret access key>';

// Set the AWS region
const region = 'eu-central-1'; // Replace with your AWS region

// Set the AWS service name (e.g., 's3', 'lambda', etc.)
const service = 'lambda';

const serviceUrl = '<service ID>';
// Set the request parameters
const options = {
  host: serviceUrl,
  path: '/', // Replace with your API endpoint
  method: 'GET', // HTTP method (GET, POST, PUT, etc.)
  headers: {
    'Content-Type': 'application/json', // Set any required headers

// Sign the request using AWS Signature Version 4
aws4.sign(options, {
  service: serviceName,

// use fetch to get response from service
const response = await fetch(`https://${serviceUrl}`, {
  method: request.method,
  headers: request.headers,

See aws4 github page for full examples.