Sandbox::https://github.com/ncoder/aws-serverless-express/blob/master/middleware.js

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module.exports.eventContext = options => (req, res, next) => {

options = options || {} // defaults: {reqPropKey: 'apiGateway', deleteHeaders: true}

const reqPropKey = options.reqPropKey || 'apiGateway'

const deleteHeaders = options.deleteHeaders === undefined ? true : options.deleteHeaders

if (!req.headers['x-apigateway-event'] || !req.headers['x-apigateway-context']) {

console.error('Missing x-apigateway-event or x-apigateway-context header(s)')

next()

return

}

req[reqPropKey] = {

event: JSON.parse(decodeURIComponent(req.headers['x-apigateway-event'])),

context: JSON.parse(decodeURIComponent(req.headers['x-apigateway-context']))

}

if (deleteHeaders) {

delete req.headers['x-apigateway-event']

delete req.headers['x-apigateway-context']

}

next()

}