Put in AWS Dynamo using python Boto3

Question

I have a table in Dynamo

Now I am trying to add a new row(product) in the table. when I am trying this with API gateway, I created a resource and created a post method with request mode Product

Request Model

{
  "$schema" : "http://json-schema.org/draft-04/schema#",
  "title" : "Error Schema",
  "type" : "object",
  "properties" : {
    "ID" : { "type" : "string" },
    "Catogory" : { "type" : "string" },
    "SubCatogory" : { "type" : "string" },
    "ProductName" : { "type" : "string" }
    
  }
}

When I am trying to invoke lambda using API gateway,

{
  "message": "Internal server error"
}

when I dig deep I am getting error as

Invalid type for parameter Item, value:     {
      "SubCatogory": "Car",
      "ID": "6",
      "ProductName": "jeep wrangler",
      "Catogory": "Vehicle"
    }, type: <class 'str'>, valid types: <class 'dict'>.

My request body looks like this.

    {
      "SubCatogory": "Car",
      "ID": "6",
      "ProductName": "jeep wrangler",
      "Catogory": "Vehicle"
    }

how to retrieve data and add in DB

Edit 1

Adding the Code used in Lambda

import json
import boto3


def lambda_handler(event, context):
    dynamodb = boto3.resource("dynamodb")
    table = dynamodb.Table('Products')
    request_params = event['body']
    project_json = request_params
    response = table.put_item(Item=project_json)
    # response = event['body']
    return {
        'statusCode': 200,
        'body': response
    }

when I am trying to returning event['body'] I can see the response as as same as inputs

EDIT 2

Have tried to convert json string to dict with json.loads(request_params)

import json
import boto3


def lambda_handler(event, context):
    dynamodb = boto3.resource("dynamodb")
    table = dynamodb.Table('Products')
    request_params = event['body']
    product_json = json.loads(request_params)
    response = table.put_item(Item=product_json)
    # response = json.loads(event['body'])
    return {
        'statusCode': 200,
        'body': response
    }

Getting error as

Execution failed due to configuration error: Malformed Lambda proxy response

Answer 1

There are a couple of problems in your code:

1. you need to parse the event body if it's JSON using Item=json.loads(event['body'])
2. you need to stringify the returned dict using 'body': json.dumps(response)