Micro-lambda NPM

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Micro Lambda

Intro

Ready to go Lambda Proxy library
Written in Typescript
Zero runtime dependencies
Tiny: 7KB after minified
Extendable with middlewares
- before (handler) hooks
- after (handler) hooks
- early exit with exit() or throw httpError()
- pass values among middlewares
You just return
- an object, it will be converted to a Lambda compatible response
- an built-in httpResponse() / success() / badRequest() / internalError()
Easier debug:
- Adding debug info to response object
- console.log event / context

Usage

Writing an API which will return a JSON and logging things like APIGatewayID and CloudWatchID, blahblah

import {lambdaWrapper, Middleware} from 'micro-lambda'

const lambda: Middleware = ({event, context, exit, passDownObj})=>{
  return {
    message: 'it works'
  }
}

const handler = lambdaWrapper({
  handler: lambda,
  config: {
    addTraceInfoToResponse: true;
    logRequestInfo: true;
  }
})

// call the API, you will get json response: {message: ""it works"}

What about I want to validate this request before executing my lambda? Easy, you just add a hook.

import { badRequest } from 'micro-lambda';

const validateRequest: Middleware = ({ event }) => {
  if (event.request.name === 'albert') {
    throw badRequest({
      message: 'bad user, byebye',
    });
  }
};

const handler = lambdaWrapper({
  // adding to the array
  // omitting the other things for briefing
  beforeHooks: [validateRequest],
});

Now if there are any problems with the request, it will exit the chain at the validateRequest rather than hitting the lambda.