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0.3.2 • Public • Published


REST DELETE from DynamoDB via Lambda

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$ npm init
$ npm install marchio-lambda-delete --save

Lambda Setup



Create Test Role

  • Browse to:
  • Click: Roles (from the left column)
  • Click: Create new role
  • Step 1: Select role type
  • Expand Section: AWS Service Role
  • For AWS Lambda, click: Select
  • Step 2 is automatically skipped
  • Step 3: Attach policy
  • Select both AmazonDynamoDB* policies
  • Click: Next Step
  • Create a name for the role (like lambda-db-delete)
  • Click: Create role

Create Lambda Function

  • Browse to:
  • Click: Create a Lambda Function
  • Select: Blank Function
  • Click: Next
  • Name: marchio-delete
  • Description: Marchio service
  • Runtime: Node.js 4.3
  • Set the Role
  • Role: Choose and existing role
  • Existing role: service-role/(name of role you created earlier)
  • Click: Next
  • Click: Create Function

Setup API Gateway

  • Browse to:
  • Click: Create API
  • Select: New API
  • API name: marchio-delete
  • Description: Marchio service
  • Click: Create API
  • Click on the slash (/)
  • Drop down: Actions
  • Select: Create Resource
  • Check: Configure as proxy resource
  • (Optionally enabled CORS)
  • Click: Create Resource
  • For Integration type select: Lambda Function Proxy
  • Lambda Region: For example: us-east-1
  • Lambda Function: marchio-delete
  • Click: Save
  • Add Permission to Lambda Function: OK
  • Drop down: Actions
  • Select: Deploy API
  • Define a new stage (call it "test")
  • Click: Deploy
  • Save the Invoke URL

Create DynamoDB Table

If you've already setup a demo for marchio-lambda-post then you may have this table already. If not, create it and load it with a few test records.

  • Browse to:
  • Click: Create Table
  • Table name: mldb
  • Primary key: eid
  • The type should be the default (string)
  • Click: Create
  • After some churning, click the Capacity tab
  • Set the Read / Write capacity units to 1 to save money while testing
  • Click: Save

Example and Deploy

See the deployment example located in the repo under:

  • examples/deploy

It contains a deployment script and an example lambda source file.

  • Install the dependencies by running:
$ npm install

To run the script you must first make it runnable:

$ chmod +x

To test:

  • Deploy the API via API Gateway
  • Create an environment variable called AWS_HOST_MARCHIO_DELETE which is set to the invocation url
  • Test the deployment using curl (substitute a valid eid value):
$ curl -i -X DELETE -H "Accept: applications/json" \
  • The response should contain a 204 status code.

Partition / Sort Tables

For DynamoDB tables where you have a partition and a sort key append the sort value to the URL:

$ curl -i -X DELETE -H "Accept: applications/json" \





Factory module




Factory module

marchio-lambda-delete-factory.create(spec) ⇒ Promise

Factory method It takes one spec parameter that must be an object with named parameters

Kind: static method of marchio-lambda-delete-factory
Returns: Promise - that resolves to {module:marchio-lambda-delete}

Param Type Description
spec Object Named parameters object
spec.event Object Lambda event
spec.context Object Lambda context
spec.callback function Lambda callback
spec.model Object Table model

Example (Usage example)

// Lambda root file
"use strict";
var mlFactory = require('marcio-lambda-delete'); 
exports.handler = function(event, context, callback) {
    var model = {
        name: 'mldb',   // must match DynamoDB table name
        partition: 'eid', // primary partition key - cannot be reserved word (like uuid)
        // sort: 'gid',  // primary sort key
        fields: {
            eid:      { type: String },  // primary partition key
            // gid:      { type: String },  // primary sort key           
            email:    { type: String, required: true },
            status:   { type: String, required: true, default: "NEW" },
            // Password will be (fake) hashed by filter before being saved
            password: { type: String, select: false },  // select: false, exclude from query results
        event: event, 
        context: context,
        callback: callback,
        model: model
    .catch(function(err) {


To test, go to the root folder and type (sans $):

$ npm test



In lieu of a formal style guide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality. Lint and test your code.

Version History

Version 0.3.2

  • updated test cases

Version 0.3.1

  • updated deploy example with latest package

Version 0.3.0

  • removed model/table name from url

Version 0.2.1

  • updated example and doc

Version 0.2.0

  • change model.primary to model.partition
  • add support for sort key

Version 0.1.0

  • initial release




npm i marchio-lambda-delete

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