How to develop locally using serverless offline

Why use the serverless offline plugin?

How to set up serverless offline

$ npm i serverless-offline

plugins:
 - serverless-offline

$ serverless offline

How to pull up command line option

const { Lambda } = require('aws-sdk')
const lambda = new Lambda({
apiVersion: 'v0.0.1',
endpoint: process.env.IS_OFFLINE
  ? 'http://localhost:3002'
  : '<YOUR_AWS_ENDPOINT>',
})

exports.handler = async function () {
   const params = {
     // FunctionName is composed of: service name - stage - function name, e.g.
     FunctionName: 'myServiceName-dev-invokedHandler',
     InvocationType: 'RequestResponse',
     Payload: JSON.stringify({ data: 'foo' }),
   }
    const response = await lambda.invoke(params).promise()
 }

$ aws lambda invoke /dev/null \
  --endpoint-url http://localhost:3002 \
  --function-name myServiceName-dev-invokedHandler

$ serverless offline --help

Serverless: Running "serverless" installed locally (in service node_modules)
offline ....................... Simulates API Gateway to call your lambda functions offline.
offline start ................. Simulates API Gateway to call your lambda functions offline using backward compatible initialization.
    --apiKey ...........................Defines the API key value to be used for endpoints marked as private. Defaults to a random hash.
    --corsAllowHeaders .................Used to build the Access-Control-Allow-Headers header for CORS support.
    --corsAllowOrigin ..................Used to build the Access-Control-Allow-Origin header for CORS support.
    --corsDisallowCredentials ..........Used to override the Access-Control-Allow-Credentials default (which is true) to false.
    --corsExposedHeaders ...............Used to build the Access-Control-Exposed-Headers response header for CORS support
    --disableCookieValidation ..........Used to disable cookie-validation on hapi.js-server
    --enforceSecureCookies .............Enforce secure cookies
    --hideStackTraces ..................Hide the stack trace on lambda failure. Default: false
    --host / -o ........................The host name to listen on. Default: localhost
    --httpPort .........................HTTP port to listen on. Default: 3000
    --httpsProtocol / -H ...............To enable HTTPS, specify directory (relative to your cwd, typically your project dir) for both cert.pem and key.pem files.
    --lambdaPort .......................Lambda http port to listen on. Default: 3002
    --noPrependStageInUrl ..............Don't prepend http routes with the stage.
    --noStripTrailingSlashInUrl ........Don't strip trailing slash from http routes.
    --noAuth ...........................Turns off all authorizers
    --ignoreJWTSignature ...............When using HttpApi with a JWT authorizer, don't check the signature of the JWT token. This should only be used for local development.
    --noTimeout / -t ...................Disables the timeout feature.
    --prefix / -p ......................Adds a prefix to every path, to send your requests to http://localhost:3000/prefix/[your_path] instead.
    --printOutput ......................Outputs your lambda response to the terminal.
    --resourceRoutes ...................Turns on loading of your HTTP proxy settings from serverless.yml.
    --useChildProcesses ................Uses separate node processes for handlers
    --useWorkerThreads .................Uses worker threads for handlers. Requires node.js v11.7.0 or higher
    --websocketPort ....................Websocket port to listen on. Default: 3001
    --webSocketHardTimeout .............Set WebSocket hard timeout in seconds to reproduce AWS limits (https://docs.aws.amazon.com/apigateway/latest/developerguide/limits.html#apigateway-execution-service-websocket-limits-table). Default: 7200 (2 hours)
    --webSocketIdleTimeout .............Set WebSocket idle timeout in seconds to reproduce AWS limits (https://docs.aws.amazon.com/apigateway/latest/developerguide/limits.html#apigateway-execution-service-websocket-limits-table). Default: 600 (10 minutes)
    --useDocker ........................Uses docker for node/python/ruby/provided
    --layersDir ........................The directory layers should be stored in. Default: {codeDir}/.serverless-offline/layers
    --dockerReadOnly ...................Marks if the docker code layer should be read only. Default: true
    --functionCleanupIdleTimeSeconds ...Number of seconds until an idle function is eligible for cleanup
    --allowCache .......................Allows the code of lambda functions to cache if supported
    --dockerHost .......................The host name of Docker. Default: localhost
    --dockerHostServicePath ............Defines service path which is used by SLS running inside Docker container
    --dockerNetwork ....................The network that the Docker container will connect to
    --region / -r ......................Region of the service
    --aws-profile ......................AWS profile to use with the command
    --app ..............................Dashboard app
    --org ..............................Dashboard org
    --use-local-credentials ............Rely on locally resolved AWS credentials instead of loading them from Dashboard provider settings (applies only to services integrated with Dashboard)
    --config / -c ......................Path to serverless config file
    --stage / -s .......................Stage of the service
    --help / -h ........................Show this message
    --version ..........................Show version info

custom:
 serverless-offline:
   httpsProtocol: "dev-certs"
   httpPort: 4000

Serverless database for Node.js

$ mkdir lambda-fauna
$ cd lambda-fauna
$ npm init -y
$ npm install faunadb
$ touch index.js

const faunadb = require('faunadb');
const client = new faunadb.Client({
   secret: '<YOUR_SECRET_KEY>',
   domain: 'db.us.fauna.com',
   // NOTE: Use the correct domain for your database's Region Group.
   port: 443,
   scheme: 'https'
});

exports.handler = async (event) => {
   return client.query(q.Paginate(q.Match(q.Ref("indexes/all_customers"))))
   .then((response) => {
     return response;
   }).catch((error) => {
     return error
   })
};

zip -r lambda-fauna.zip ./

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