Why does my app crash upon receiving a webhook?

Shopify Apps
1

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Hello,

My app keep crashing with this error whenever I receive a webhook.

client = new rest_1.RestClient(session.shop, session.accessToken);
                                                       ^

TypeError: Cannot read properties of undefined (reading 'shop')
    at Function.

I am responding with a 200 status response when i receive a webhook but it still crashes. It is really frustrating me as I am unable to find a solution.
2

This would happen if you do not store the offline session. Do you store it? Is your app set to online or offline session tokens? Or both?

3

I’m not sure but I think it’s set to offline session tokens as i get offline session tokens in the cookies

cookie.PNG

And I don’t think I’m storing the offline session.
this is how im initializing the context

const { API_KEY, API_SECRET_KEY, SCOPES, SHOP, HOST } = process.env
if (!API_KEY) {
    console.log(API_KEY);
}

Shopify.Context.initialize({
    API_KEY,
    API_SECRET_KEY,
    SCOPES: [SCOPES],
    HOST_NAME: HOST.replace(/https:\/\//, ""),
    IS_EMBEDDED_APP: false,
    API_VERSION: ApiVersion.April22 // all supported versions are available, as well as "unstable" and "unversioned"
});

and the only time im getting a session is on /auth/callback

case "/auth/callback":
            try {
                const session = await Shopify.Auth.validateAuthCallback(request, response, query as AuthQuery);
                ACTIVE_SHOPIFY_SHOPS[SHOP] = session.scope;

                const response = await Shopify.Webhooks.Registry.register({
                    path: '/webhooks',
                    topic: 'CUSTOMERS_CREATE',
                    accessToken: session.accessToken,
                    shop: session.shop,
                  });
              
                  if (!response['CUSTOMERS_CREATE'].success) {
                    console.log(
                      `Failed to register CUSTOMERS_CREATE webhook: ${response.result}`
                    );
                  }

                // all good, redirect to '/'
                const searchParams = new URLSearchParams(request.url);
                const host = searchParams.get("host");
                const shop = searchParams.get("shop");
                response.writeHead(302, { Location: `/?host=${host}&shop=${shop}` });
                response.end();
            }
            catch (e) {
                console.log(e);

                response.writeHead(500);
                if (e instanceof Shopify.Errors.ShopifyError) {
                    response.end(e.message);
                }
                else {
                    response.end(`Failed to complete OAuth process: ${e.message}`);
                }
            }
            break;
        // end of if (pathName === '/auth/callback'')

I tried storing the session but i’m kind of clueless how to do it.

4

I see. To know if you store it or not you need to check in the context if you are using custom storage ? (Check this line here https://github.com/Shopify/shopify-app-template-node/blob/a572a919cf26b1e913fe176e6605191c5a8bd024/server/index.js#L25)

Also are you setting your app online or offline (check this line here https://github.com/Shopify/shopify-app-template-node/blob/a572a919cf26b1e913fe176e6605191c5a8bd024/server/index.js#L11)

5

Thank you so much for the help! I am storing the session now.