Testing Lambda NodeJS locally

Question

I'm trying to follow the examples found here, but am not quite getting it. Here is what I have:

simpletest.js:

exports.handler = async (event) => {
    console.log('>> Handler called');

    const response = {
        statusCode: 200,
        body: JSON.stringify('Handler Data')
    };

    console.log('>> Response[1]: ' + JSON.stringify(response));
    return response;
};

simplerun.js

let process = require('./simpletest.js');

console.log(">> START");
process.handler(
  {}, // event
  {}, // context
  function(response,error) {
    console.log(">> Response[2]: " + response);
  }
);
console.log(">> END");

What I got:

% node simplerun.js
>> START
>> Handler called
>> Response[1]: {"statusCode":200,"body":"\"Handler Data\""}
>> END

What I expected:

% node simplerun.js
>> START
>> Handler called
>> Response[1]: {"statusCode":200,"body":"\"Handler Data\""}
>> Response[2]: {"statusCode":200,"body":"\"Handler Data\""}
>> END

Why isn't Response[2] being generated as expected?

T.D. Stoneheart · Accepted Answer · 2021-08-24 15:19:06Z

2

In the handler function of simpletest.js, you haven't used the third parameter to call the desired callback function.

You might need to change the function to something like...

async (event, context, callback) => {
    console.log('>> Handler called');

    const response = {
        statusCode: 200,
        body: JSON.stringify('Handler Data')
    };

    console.log('>> Response[1]: ' + JSON.stringify(response));
    callback(response); // instead of returning, execute the callback
};

answered Aug 24, 2021 at 15:19

T.D. Stoneheart

9365 silver badges7 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Testing Lambda NodeJS locally

1 Answer 1

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related