aws-lambda-response

A simple package for building standard responses in AWS Lambda callback functions to be handled by API Gateway.

Install

$ npm install --save aws-lambda-response

Why

API Gateway does not support objects as the error parameter in callbacks from Lambda, this package solves this by stringifying error and failure responses and assumes the JSON is parsed at API Gateway level.

Usage

import resp from 'aws-lambda-response';
 
function handler(event, context, callback) {
  callback(null, resp.success(200, { hello: "World"}));
}
 
export { handler };
 

API

The following API is based on the imported module being named resp, however it can be substituted for any name you want.

// ES6 modules
import resp from 'aws-lambda-response';
 
// commonJS modules
const resp = require('aws-lambda-response');

---

resp.success(statusCode, data)

Params

statusCode

Type: int

HTTP status code to be mapped in the API Response header

data

Type: object

Response payload.

Returns

Type: object

{
  status: "success",
  httpStatus: (int)statusCode,
  data: (obj)data
}

---

resp.error(statusCode, message, data)

Params

statusCode

Type: int

HTTP status code to be mapped in the API Response header

message

Type: string

Error message

data

Type: object

Any additional response data.

Returns

Type: string

Stringified object to be parsed in API Gateway output mapping.

{
  "status": "error",
  "httpStatus": "(int)statusCode",
  "message": "(string)message",
  "data": "(object)data"
}

---

resp.fail(statusCode, data)

Params

statusCode

Type: int

HTTP status code to be mapped in the API Response header

data

Type: object

Response data that may help explain the issue. Can be be a string if the information is better presented as one.

Returns

Type: string

Stringified object to be parsed in API Gateway output mapping.

{
  "status": "fail",
  "httpStatus": "(int)statusCode",
  "data": "(object)data"
}

---

License

MIT