Lambda Error Formatter

Helper function for formatting errors in AWS Lambda functions for easy integration with AWS API Gateway.

Usage

npm install --save @aptoma/lambda-error-formmtter

const errorFormatter = require('@aptoma/lambda-error-formatter');

exports.handler = (event, context, callback) => {
    try {
        throw new Error('Oops');
    } catch (e) {
        callback(errorFormatter.format(500, e, context.awsRequestId));
    }
};

API Gateway Response Integration

In your API Gateway, you should register Method Responses for all the error codes you intend to use.

For each error code, you must create an Integration Response:

Provide a Lambda Error Regex like (.*)httpStatusCode\":400(.*), and set up a body mapping template for application/json:

$util.parseJson($input.json('$.errorMessage'))