Why Does My Lambda Function Not `startExecution` My Step Function - amazon-web-services

Question

I am looking to connect my Lambda with my Step Function, and cannot figure out why it will not startExecution.
SDK Code:
import AWS from "aws-sdk";
const stepfunctions = new AWS.StepFunctions({ apiVersion: "2016-11-23" });
interface Params {
stateMachineArn: string;
input: string;
}
export async function handler(event: any, context: object) {
console.log("event.body", event.body);
const params: Params = {
stateMachineArn: process.env.STEP_FUNCTION_ARN,
input: JSON.stringify(event.body),
name: "testNameField",
};
console.log("PARAMS", params);
stepfunctions.startExecution(params, (err: any, data: any) => {
if (err) {
console.log("THERE WAS AN ERROR", err);
console.log("ERROR STACK", err.stack);
} // an error occurred
else {
console.log("data", data);
} // successful response
});
}
Permissions:
Allow: states:DeleteStateMachine
Allow: states:StartExecution
Allow: states:CreateStateMachine
Allow: states:SendTaskSuccess
Allow: states:DeleteActivity
Allow: states:SendTaskHeartbeat
Allow: states:CreateActivity
Allow: states:SendTaskFailure
Allow: states:StopExecution
Allow: states:GetActivityTask
Allow: states:UpdateStateMachine
Allow: states:StartSyncExecution
Extra information:
I have tried doing a "test" on the console for the lambda function,
from which it succeeds. I'm not sure where else to look.
In the step function, all the columns
(Total/Running/Succeeded/Failed/Timed out/Aborted) are 0.
The params console.log offers the correct information

Answer 1

Are there any error messages outputted from the console.log?

Answer 2

Solution Code:
const AWS = require("aws-sdk");
AWS.config.update({ region: "eu-west-1" });
const stepFunction = new AWS.StepFunctions();
interface Params {
stateMachineArn: string;
input: string;
name: string;
}
exports.handler = async (event: any) => {
console.log(event);
const stepFunctionParams = {
stateMachineArn: process.env.STEP_FUNCTION_ARN,
input: JSON.stringify({
message: event.body,
}),
name: "name" + String(Date.now()),
};
try {
const stepFunctionResponse = await stepFunction
.startExecution(stepFunctionParams)
.promise();
return { statusCode: 200, body: "Success" };
} catch (e) {
console.log("Problem executing SF :", JSON.stringify(e));
return {
statusCode: 500,
body: "Problem executing step function : " + JSON.stringify(e),
headers: { "Access-Control-Allow-Origin": "*" },
};
}
};