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REST GET from DynamoDB via Lambda

Continuous Integration Coverage Status Downloads Version License


$ npm init
$ npm install marchio-lambda-get --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 AmazonDynamoDBReadOnlyAccess policiy
  • Click: Next Step
  • Create a name for the role (like lambda-db-get-only)
  • Click: Create role

Create Lambda Function

  • Browse to:
  • Click: Create a Lambda Function
  • Select: Blank Function
  • Click: Next
  • Name: marchio-get
  • 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-get
  • 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-get
  • 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_GET which is set to the invocation url
  • Test the deployment using curl (substitute a valid eid value):
$ curl -i -X GET -H "Accept: applications/json" \
  • The response should contain a 200 status code and a copy of the record.





Factory module




Factory module

marchio-lambda-get-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-get-factory
Returns: Promise - that resolves to {module:marchio-lambda-get}

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-get'); 
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',
        fields: {
            eid:      { type: String },  // return eid / primary partition in GET results
            // gid:      { type: String },  // return gid / primary sort in GET results
            email:    { type: String, required: true },
            status:   { type: String, required: true, default: "NEW" },
            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 0.3.1

  • updated deploy example

Version 0.3.0

  • removed model/table name from url
  • updated deploy-build examples

Version 0.2.2

  • removed comment from demo

Version 0.2.1

  • Added support for primary sort key

Version 0.2.0

  • Change model.primary to model.partition

Version 0.1.5

  • Updated doc and demo deploy to show how to return primary key if required

Version 0.1.4

  • Integrated module documentation into readme

Version 0.1.3

  • Updated role documentation

Version 0.1.2

  • Updated service to only return record and not Item wrapper.

Version 0.1.1

  • Fixed issue with object passed to DynamoDB.getItem

Version 0.1.0

  • initial release