How can the request object be obtained in a Node.js lambda function using Serverless Websockets?

Question

How can the request object be obtained in a Node.js lambda function using Serverless Websockets?

Connecting my client application to the Websocket server using the URL: wss://xxxxxxx/xxxxx/xxxx?value=abcd

The WebSocket server I'm working on needs to retrieve the value "abcd" that is passed by the client in the request URL. However, all I can find in my NodeJS server-side handler code is:

exports.handler = async function (event, context) {
const {
body,
requestContext: {
  connectionId,
  routeKey
}
} = event;
switch (routeKey) {
case '$connect':
......

My question is: How can I access this query string in my $connect block?

node.js lambda websocket serverless

Answer 1

Answer №1

event refers to an instance of APIGatewayProxyEvent. If this is the case, you can access query parameters by referencing the event object.

In your specific scenario, the code snippet would look something like this:

...
const {
  queryStringParameters, // included here
  body,
  requestContext: {
    connectionId,
    routeKey
  }
} = event;

const value = queryStringParameters.value || ''; // assuming the url is wss://xxxxxxx/xxxxx/xxxx?value=abcd, the value will be `abcd`
...

Answer 2

event refers to an instance of APIGatewayProxyEvent. If this is the case, you can access query parameters by referencing the event object.

In your specific scenario, the code snippet would look something like this:

...
const {
  queryStringParameters, // included here
  body,
  requestContext: {
    connectionId,
    routeKey
  }
} = event;

const value = queryStringParameters.value || ''; // assuming the url is wss://xxxxxxx/xxxxx/xxxx?value=abcd, the value will be `abcd`
...

How can the request object be obtained in a Node.js lambda function using Serverless Websockets?

Answer №1

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