Get url parameter in Lambda (Nodejs) passed by API Gateway

Question

I have set up API Gateway endpoint like this:

GET files/{filename}

Therefore, I would call it something like this: https://mydomain/api/files/somefile

I have also a lambda function with Nodejs which is empty:

exports.handler = function(event, context) {

//Retrieve here the param called 'filename' and do something with it

};

How can I get the param passed on the GET request?. I have checked out the event and context objects but I could not find anything helpful.

Thanks!!

guycole · Accepted Answer · 2016-04-18 15:10:00Z

5

To get path parameters, HTTP header variables (etc) you must create a mapping template.

From the API Gateway console, select your get resource and you should see a panel w/4 boxes.
Click on "Integration Request" (top right box)
Expand "body mapping template" on bottom
Define content type (most likely "application/json")
Try "generate template:method request passthru" to get started
Save
Now try "Test" for your HTTP Get, and hopefully you will see the missing path param, etc.

Good luck.

answered Apr 18, 2016 at 15:10

guycole

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