# Node expresss backend url?

**URL:** <https://community.firebasestudio.dev/t/node-expresss-backend-url/1007>\
**Category:** General\
**Created:** [July 17, 2024, 2:03pm UTC](https://community.firebasestudio.dev/t/node-expresss-backend-url/1007 "2024-07-17T14:03:44Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![magabee](https://sea2.discourse-cdn.com/flex002/user_avatar/community.firebasestudio.dev/magabee/32/874_2.png) [@magabee](https://community.firebasestudio.dev/u/magabee)\
**Post date:** [July 17, 2024, 2:03pm UTC](https://community.firebasestudio.dev/t/node-expresss-backend-url/1007/1 "2024-07-17T14:03:44Z")

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where can i find url of my backend project on idx? let’s say i need to fetch the backend from my frontend. what should i fetch to?

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**Author:** ![jbm](https://sea2.discourse-cdn.com/flex002/user_avatar/community.firebasestudio.dev/jbm/32/793_2.png) [@jbm](https://community.firebasestudio.dev/u/jbm)\
**Post date:** [July 17, 2024, 11:35pm UTC](https://community.firebasestudio.dev/t/node-expresss-backend-url/1007/2 "2024-07-17T23:35:21Z")

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Hi @magabee. IDX is a development environment, and doesn’t support being treated as a live backend the same way a VPS is.

You can test your backend from IDX using `localhost` loopback and the port of your server, which can be found in the IDX panel here:

 ![Screenshot 2024-07-16 at 1.28.55 PM](https://us1.discourse-cdn.com/flex002/uploads/idxcommunity/original/1X/476b3a6a48d8498c31a9e943f2c8b11f64133d6a.png)

Once you’re ready to go live, you can [deploy your backend](https://developers.google.com/idx/guides/deploy-app) to Cloud Run or Firebase

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<div class="post-metadata">

**Author:** ![magabee](https://sea2.discourse-cdn.com/flex002/user_avatar/community.firebasestudio.dev/magabee/32/874_2.png) [@magabee](https://community.firebasestudio.dev/u/magabee)\
**Post date:** [July 18, 2024, 1:12pm UTC](https://community.firebasestudio.dev/t/node-expresss-backend-url/1007/3 "2024-07-18T13:12:30Z")

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Thanks. I’ve found mapped url in this section but can’t making request due to cors error even implemented cors in express app. Just followed IDX full stack documentation but can’t figure out why it isn’t working.

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**Author:** ![treeder](https://sea2.discourse-cdn.com/flex002/user_avatar/community.firebasestudio.dev/treeder/32/215_2.png) [@treeder](https://community.firebasestudio.dev/u/treeder)\
**Post date:** [July 23, 2024, 10:11pm UTC](https://community.firebasestudio.dev/t/node-expresss-backend-url/1007/4 "2024-07-23T22:11:26Z")

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You can’t use an API separate from your frontend app with IDX, there’s various posts in this forum about this issue. They say they are working on it, but until then you’ll have to use something else.