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awslambdaproxyresponse

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  • License MIT

Generates response payloads for AWS Lambda functions behind API Gateway 'Lambda proxy' integrations.

Package Exports

  • awslambdaproxyresponse

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (awslambdaproxyresponse) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

AWS Lambda proxy response

A Node.js module which generates response payloads for API Gateway fronted Lambda functions integrated via the Lambda proxy method.

NPM

The response structure takes the following form:

{
    statusCode: httpStatusCode,
    headers: { headerName: 'headerValue' },
    body: '...'
}

Methods

AWSLambdaProxyResponse([statusCode])

  • Creates new AWSLambdaProxyResponse instance.
  • Optional statusCode sets the HTTP status code for the response, otherwise defaults to 200 / OK.
  • Collection of valid HTTP codes defined at AWSLambdaProxyResponse.HTTP_STATUS.
  • Constructor will throw an exception if given statusCode is not within this collection.

Example:

const AWSLambdaProxyResponse = require('awslambdaproxyresponse');

const resp = new AWSLambdaProxyResponse(
    AWSLambdaProxyResponse.HTTP_STATUS.FOUND
);

AWSLambdaProxyResponse.setStatusCode(statusCode)

  • Sets the HTTP statusCode for a response.
  • Throws an exception if given statusCode is not within the AWSLambdaProxyResponse.HTTP_STATUS collection.
  • Returns AWSLambdaProxyResponse instance.

AWSLambdaProxyResponse.addHeader(name[,value])

  • Adds HTTP headers to the Lambda proxy response.
  • Single HTTP header can be added by providing a name / value pair.
  • Multiple headers can be added by providing an object collection as name only.
  • Throws an exception if header names don't match the regular expression pattern /^[A-Za-z-]+$/.
  • Returns AWSLambdaProxyResponse instance.

Example:

const AWSLambdaProxyResponse = require('awslambdaproxyresponse');
const resp = new AWSLambdaProxyResponse();

// lets add a single header
resp.addHeader('Content-Type','text/html');

// add several others
resp.addHeader({
    'x-custom-header': 'value',
    'x-user-auth': 'Donald Duck'
});

AWSLambdaProxyResponse.setBody(body)

  • Sets the response body payload.
  • If body is not of type string, will be automatically serialized via JSON.stringify().
  • Returns AWSLambdaProxyResponse instance.

AWSLambdaProxyResponse.getPayload()

Returns a valid Lambda proxy response structure object.

Constants

AWSLambdaProxyResponse.HTTP_STATUS

A collection of valid HTTP status codes for use with the AWSLambdaProxyResponse() constructor or setStatusCode(statusCode) method:

const AWSLambdaProxyResponse = require('awslambdaproxyresponse');
console.dir(AWSLambdaProxyResponse.HTTP_STATUS);

/*
{
    OK: 200,
    MOVED: 301,
    FOUND: 302,
    BAD_REQUEST: 400,
    UNAUTHORIZED: 401,
    FORBIDDEN: 403,
    NOT_FOUND: 404,
    SERVER_ERROR: 500,
    NOT_IMPLEMENTED: 501,
    BAD_GATEWAY: 502,
    SERVICE_UNAVAILABLE: 503,
    GATEWAY_TIMEOUT: 504
}
*/

Example usage

Within the context of a Lambda function:

const AWSLambdaProxyResponse = require('awslambdaproxyresponse');

exports.myHandler = (event,context,callback) => {

    // create our response
    const resp = new AWSLambdaProxyResponse();
    resp.setBody('Hello world');

    // return from Lambda
    callback(null,resp.getPayload());

    /*
    console.dir(resp.getPayload());
    {
        statusCode: 200,
        headers: {},
        body: 'Hello world'
    }
    */
};

A Lambda response that results in a redirect:

const AWSLambdaProxyResponse = require('awslambdaproxyresponse');

exports.myHandler = (event,context,callback) => {

    // create our response
    const resp = new AWSLambdaProxyResponse();

    resp.setStatusCode(AWSLambdaProxyResponse.HTTP_STATUS.MOVED);
    resp.addHeader('Location','https://my.new.domain.com/');

    // return from Lambda
    callback(null,resp.getPayload());

    /*
    console.dir(resp.getPayload());
    {
        statusCode: 301,
        headers: { Location: 'https://my.new.domain.com/' },
        body: ''
    }
    */
};

Reference