How to test aws lambda functions locally
Solution 1
It doesn't look like there's way to do this right now, but version 1.4.0 is about to be released and, among other things, it should include a new command "jaws serve" which should address your problem.
Here's the PR: https://github.com/jaws-framework/JAWS/pull/269
UPDATE: you can now use the new serverless-serve plugin for this.
UPDATE 2: serverless-serve hasn't been updated in a while, it looks like serverless-offline is a much better option now to emulate Lambda functions.
Solution 2
You can now use lambda-local.
Install it like this:
sudo -H npm install -g lambda-local
Add your parameters as a JSON object to a file, in this example event.json
, and call the index.js
file like this:
lambda-local -l index.js -h handler -e event.json
Solution 3
I'm not sure if this question is still relevant or not, but I'm using DEEP Framework to test the code locally and/or deploy it on AWS Lambda. Check this out:
npm install deepify -g
deepify run-lambda --help
[email protected] - Run Lambda function locally
Usage example: deepify run-lambda path/to/the/lambda -e='{"Name":"John Doe"}'
Arguments:
path: The path to the Lambda (directory of handler itself)
Options:
--event|-e: JSON string used as the Lambda payload
--skip-frontend-build|-f: Skip picking up _build path from the microservices Frontend
--db-server|-l: Local DynamoDB server implementation (ex. LocalDynamo, Dynalite)
--version|-v: Prints command version
--help|-h: Prints command help
Disclosure: I am one of the contributors to this framework
Solution 4
The serverless framework now provide a way to invoke functions locally
With that, you can create queries in json files like
{
"body": "{\"hello\":\"world\"}",
"pathParameters": {
"id": "foo"
},
"queryStringParameters": {
"bar": "42"
}
"requestContext": {
"identity": {
"cognitoIdentityId": "cognito-id"
}
}
}
If your function is described in serverless.yml
file, you can then invoke it locally with
serverless invoke local --function yourFunction --path path/to/your/mock.json
Solution 5
The Bespoken sevrerless plugin makes your local Lambdas externally accessible. It is very useful both for local testing with Postman as well as for Webhook-based services (like Alexa, Slack, Twilio, etc.).
The architecture is shown here:
To use it, you just install the plugin, then run:
sls proxy
You can then start sending requests to your service locally:
We think it is a very useful tool for testing with serverless.
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Supun Induwara
Updated on June 24, 2022Comments
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Supun Induwara almost 2 years
I have a mobile application backend developed with node.js express. I tried it to deploy it as lambda service. For that I created a Serverless Framework project (https://github.com/serverless). Previously I tested mobile app locally by starting express backend application. Now I can't find a method to test my mobile app locally without local backend.
jaws run
command only run once I called it.Is there any method to start the lambda function as a web service? Or is there any alternative to Serverless Framework?
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tedder42 about 8 yearscan't get this to work :/ hangs after "starting lambda".
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Supun Induwara over 6 yearsThanks, serverless can be used not only for offline test but it also helps to deploy and other lots of stuff.
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Cukic0d over 4 yearsDoesn't support everything but at least that's very light
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Thilina Koggalage over 4 yearsThis is what I was looking for. Thanks!