Single Lambda function for all CRUD operations with DynamoDB in REST API

dynamodb-rest-api-lambda.js

console.log('Loading function');

var doc = require('dynamodb-doc');
var dynamo = new doc.DynamoDB();

/**
 * Provide an event that contains the following keys:
 *
 *   - operation: one of the operations in the switch statement below
 *   - tableName: required for operations that interact with DynamoDB
 *   - payload: a parameter to pass to the operation being performed
 */
exports.handler = function(event, context) {
    //console.log('Received event:', JSON.stringify(event, null, 2));

    var operation = event.operation;

    if (event.tableName) {
        event.payload.TableName = event.tableName;
    }

    switch (operation) {
        case 'create':
            dynamo.putItem(event.payload, context.done);
            break;
        case 'read':
            dynamo.getItem(event.payload, context.done);
            break;
        case 'update':
            dynamo.updateItem(event.payload, context.done);
            break;
        case 'delete':
            dynamo.deleteItem(event.payload, context.done);
            break;
        case 'list':
            dynamo.scan(event.payload, context.done);
            break;
        case 'echo':
            context.succeed(event.payload);
            break;
        case 'ping':
            context.succeed('pong');
            break;
        default:
            context.fail(new Error('Unrecognized operation "' + operation + '"'));
    }
};

@karmanya77 This snippet is almost 4 years old and it uses a deprecated npm package (dynamodb-doc). Please, consult other sources for a working and more up-to-date example.

@apaatsio okay.. thanks for the quick response