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@vacationtracker/api-gateway-http-response

v1.2.0

Published

A small library that generates API Gateway HTTP responses for Lambda proxy integration (ie. for CloudFormation and AWS SAM)

Downloads

34

Readme

API Gateway HTTP Response for AWS Lambda

Build Status npm npm

A small library that generates API Gateway HTTP responses for Lambda proxy integration. It can be used with AWS CloudFormation and AWS SAM.

Usage

This package exports a function that accepts four params and returns an object.

Function Params

Function accepts following four params:

  • Response body (optional) - A string or an object that should be returned as a HTTP response from the API Gateway. Default value is an empty string.

  • Status code (optional) - A number that represents HTTP status code. Default values are:

    • 204, if response body is an empty string.
    • 200, if response body is a string or an object.
    • 400, if response body is an instance of JavaScript Error.
  • Headers (optional) - An object with headers that will be passed as response headers. Default value is:

    {
        "Access-Control-Allow-Headers": "Content-Type,Authorization,X-Amz-Date,X-Api-Key,X-Amz-Security-Token",
    	"Access-Control-Allow-Methods": "OPTIONS,POST,GET,PUT,DELETE",
    	"Access-Control-Allow-Origin": "*",
    	"Access-Control-Max-Age": "86400"
    }
  • isBase64Encoded (optional) - true or false to enable or disable base64 encoding. Default value is false.

Output

The output of this function is an object in a valid Lambda function proxy integration format, described here. For example, a valud output for httpResponse('hello world') would be the following object:

{
    "isBase64Encoded": false,
    "statusCode": 200,
    "body": "hello world",
    "headers": {
   		"Access-Control-Allow-Headers": "Content-Type,Authorization,X-Amz-Date,X-Api-Key,X-Amz-Security-Token",
		"Access-Control-Allow-Methods": "OPTIONS,POST,GET,PUT,DELETE",
		"Access-Control-Allow-Origin": "*",
		"Access-Control-Max-Age": "86400"
	}
}

Example usage

A common usage would be inside an AWS Lambda function, similar to this:

'use strict'

const httpResponse = require('@vacationtracker/api-gateway-http-response')
const parseApiEvent = require('./parse-event') // A function that parses an event
const businessLogic = require('./business-logic') // A function that handles a logic for your Lambda function

async function lambda(event) {
  const request = parseApiEvent(event)
  try {
    const body = await businessLogic(request)
    return httpResponse(body)
  } catch(err) {
    return httpResponse(err)
  }
}

exports.handler = lambda

CORS support

By default, this function will return headers that supports CORS from any origin. Supported HTTP methods are: OPTIONS, POST, GET, PUT and DELETE.

Motivation

I wrote similar thing many times, packing it into a small independent package is easier that searching through other projects.

License

MIT -- see LICENSE