Passing in value to an invoked lambda function from node.js function

Question

I have successfully invoked a lambda function from within my node file. It returns 200 and success, but I need to pass in a value to the function I am calling and am unsure how to do that. I am beginning to learn lambda and believe I am not understanding correctly how some things operate. I am attempting to pass in an email address to the lambda function.

function callLambda(){
var AWS = require('aws-sdk');
AWS.config.region = 'us-west-2'

var lambda = new AWS.Lambda();
var params = {
  FunctionName: 'UploadDailyRecords', 
  Payload: '{"client_id" : "[email protected]"}'
};
lambda.invoke(params, function(err, data) {
  if (err) console.log(err, err.stack);
  else     console.log(data);         
});
}
callLambda();

Also, I am unsure of the correct format of how to invoke it from the other function to accept a variable from this invocation. This is the way the invoked lambda is set up on AWS.

exports.handler = function(event, context, callback) {
  get_clients_email();
  callback(null, "completed");
}

Thanks for any help.

What did the final solution look like here? How would it work if I need to pass to attributes in the Payload object? — lopezdp
– lopezdp, Commented Aug 13, 2020 at 14:18

Mark B · Accepted Answer · 2017-04-12 16:00:23Z

9

Everything looks good, you just need to access the payload parameter in your Lambda function now via event.client_id.

answered Apr 12, 2017 at 16:00

Mark B

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9 Comments

Mike Over a year ago

can you elaborate? When I run this and invoke "get_clients_email();", that works, but there is nothing being passed into it. I need to pass what is in the payload to the lambda. What I am thinking you are saying is in "get_clients_email()", i should make it, "get_clients_email(event.client_id)"?

Mike Over a year ago

That was it. get_clients_email(event.client_id) made it work. I was able to console.log to verify the variables were being passed. Thanks!

Mike Over a year ago

One other thing. Now that it works, I am trying to pass in something that is not hardcoded as the payload. From my experience, it has to be in string format. I tried passing in a hash, it wouldnt accept it. I tried creating a string around it with clientstring = " ' " + clienthash + " ' " and it wouldnt accept that. Any idea on how I can pass a hash into it as its string format it seems to require?

Mark B Over a year ago

You are currently passing a JSON string in the payload. You can't pass a variable/object/hash whatever directly, you have to convert it such that the entire payload parameter is a valid JSON string.

Mike Over a year ago

Yes, I'm trying to build that valid JSON string, but I am finding it very difficult. No matter how I try to build it, it is not coming out in the acceptable format. Very frustrating. Anyways, thanks for your help.

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