Get URL that invoked the AWS HTTP API using Lambda - Node.js

Question

I want to build some routes for my todos, example:

List
Get
etc

So in order to do this I thought to check for the URL invoking the API (please if there is a better way call me out). I'm trying it out in a simple lambda first but can't get the URL, this is what I tried:

'use strict';

exports.handler = async (event) => {
    
    let itsCallingFrom = event.requestContext.pathParameters;
    
    const response = {
        statusCode: 200,
        body: JSON.stringify('Calling from: ' + itsCallingFrom),
    };
    return response;
};

This is how my Route looks:

/listalltodos
    GET

This is what the event shows:

This is what I get: "Calling from: undefined"

Any idea how to get it?

Thanks

A bit late to the party, but: The pathParameters are in the event not in the event.requestContext ... Furthermore event.pathParameters is an object so concatenating to a string might give some unexpected result (ie it's stringified as [object Object]) But as your route doesn't seem to have any parameters (for instance some element id or similar, ie a variable part in the path) event.pathParameters may also be null or undefined — derpirscher
– derpirscher, Commented Dec 1, 2021 at 11:28

Marcin · Accepted Answer · 2021-01-24 03:10:51Z

3

The form of event object in HTTP api is shown here. It does not have a parameter such as pathParameters.

Instead you can use:

event.rawQueryString
event.rawPath

Or if you just want parameters then you can use:

event.queryStringParameters - this will not be present if parameters are not provided, so you can use:

let itsCallingFrom = event.queryStringParameters || 'none';

answered Jan 24, 2021 at 3:10

Marcin

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2 Comments

ElKePoN Over a year ago

Excellent, I was looking for event.rawPath that worked :) Thanks Marcin

derpirscher Over a year ago

Maybe the documentation changed in the meantime, but the referenced documentation clearly states, that there is indeed a event.pathParameters (although it might not always be present if the matched route doesn't define any parameters)

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