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reading","robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":false,"can_crawl_api":true,"host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["aws","ffleet","lambda","nodejs","serverless"],"created_at":"2025-11-16T07:00:34.695Z","updated_at":"2026-01-14T13:03:14.135Z","avatar_url":"https://github.com/ffleet.png","language":"JavaScript","funding_links":[],"categories":["Others"],"sub_categories":[],"readme":"# AWS Lambda Shim\n\n[![CircleCI](https://img.shields.io/circleci/project/github/ffleet/shim.svg)](#readme)\n[![npm](https://img.shields.io/npm/v/@ffleet/shim.svg)](https://www.npmjs.com/package/@ffleet/shim)\n\n\u003e A Better Lambda API\n\nThis library provides an abstraction between the AWS Lambda events and classic node.js calling conventions.\n\nThis project is sponsored by the Functional Fleet [Serverless Platform](https://ffleet.io). We are currently accepting beta users for our platform, featuring a free git repo, hosted deploy queue, and centralized monitoring.\n\n## Why\n\nAWS Lambda has a somewhat unintuitive API structure that is sometimes inconsistent with node.js standards. This library bridges the gap, allowing you to write more familiar node.js style code.\n\n## Wrap\n\nWrapping your function standardizes the calling conventions across all versions of Node.js and all AWS Lambda event sources. This includes:\n\n* Supporting `Promise` returns, rather than the callback argument\n* Standardizing arguments to `(event, callback)`\n* Providing additional helpers through the `this` object\n\nExample:\n```js\nvar shim = require('@ffleet/shim');\nvar myLib = require('./lib');\n\n// callback is not needed with Promise\nfunction myHandler(event) {\n\t// myLib.handle returns a promise\n\treturn myLib.handle(event);\n}\n\nexports.myHandler = shim.wrap(myHandler);\n```\n\n## Libraries\n\nThe specific API shims below provide context specific APIs for certain Lambda events.\n\n### HTTP\n\nNode.js HTTP servers are built around `request` and `response` objects passing through route handlers. This has been embraced by the common node.js HTTP libraries as well (Express, Hapi, Restify, etc.).\n\nThe `http` shim creates a native node.js HTTP server and proxies the AWS Lambda event.\n\nFor example, using a native handler:\n```js\nconst shim = require('@ffleet/shim');\n\nfunction myNativeHttpHandler(req, res) {\n\tres.end('Hello, World!');\n}\n\nexports.myNativeHttpHandler = shim.http(myNativeHttpHandler);\n```\n\nOr, you can wrap an entire Express server:\n```js\nconst shim = require('@ffleet/shim');\nconst express = require('express');\nconst app = express();\n\napp.get('/', function(req, res, next) {\n\tres.send('Hello, World!');\n});\n\nexports.myExpressHttpHandler = shim.http(app);\n```\n\n### Cron\n\nCron functions are executed by AWS CloudWatch Events. Wrapping with the `cron` shim unpacks the event data and provides a `Date` object of when the cron event was generated.\n\n```js\nconst shim = require('@ffleet/shim');\n\nfunction myCron(date, callback) {\n\tconsole.log('cron event generated at ' + date.toISOString());\n}\nexports.myCron = shim.cron(myCron);\n```\n\n### Logs\n\nAWS CloudWatch Log data is provided in a base64 encoded and gzip packed data string. The `logs` shim will decode the log data and reconstitute the represented JSON object, as:\n\n```json\n{\n\t\"messageType\": \"DATA_MESSAGE\",\n\t\"owner\": \"123456789123\",\n\t\"logGroup\": \"testLogGroup\",\n\t\"logStream\": \"testLogStream\",\n\t\"subscriptionFilters\": [\"testFilter\"],\n\t\"logEvents\": [{\n\t\t\"id\": \"eventId1\",\n\t\t\"timestamp\": 1440442987000,\n\t\t\"message\": \"[ERROR] First test message\"\n\t}, {\n\t\t\"id\": \"eventId2\",\n\t\t\"timestamp\": 1440442987001,\n\t\t\"message\": \"[ERROR] Second test message\"\n\t}]\n}\n```\n\nExample:\n```js\nconst shim = require('@ffleet/shim');\n\nfunction myLogHandler(logObject, callback) {\n\tlogObject.logEvents.forEach(logEvent =\u003e console.log('log', logEvent));\n}\nexports.myLogHandler = shim.logs(myLogHandler);\n```\n\n## License\n\nMIT License\n\nCopyright (c) 2018 Functional Fleet\n\nPermission is hereby granted, free of charge, to any person obtaining a copy\nof this software and associated documentation files (the \"Software\"), to deal\nin the Software without restriction, including without limitation the rights\nto use, copy, modify, merge, publish, distribute, sublicense, and/or sell\ncopies of the Software, and to permit persons to whom the Software is\nfurnished to do so, subject to the following conditions:\n\nThe above copyright notice and this permission notice shall be included in all\ncopies or substantial portions of the Software.\n\nTHE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\nIMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\nFITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\nAUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\nLIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\nOUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\nSOFTWARE.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fffleet%2Fshim","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fffleet%2Fshim","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fffleet%2Fshim/lists"}