# CORS Checker

Check whether a URL can be read from this browser origin and inspect visible CORS headers.

## URL

https://ilham.dev/tools/cors-checker/

## What It Does

Check whether a URL can be read by JavaScript from this site origin. The tool sends a browser fetch request and, where possible, an OPTIONS-style probe, then reports what the browser allowed the page to see. It cannot spoof arbitrary Origin headers because browsers deliberately do not allow that.

## Features

- Runs in the browser
- No login required

## Input

text input.

## Output

text output.

## Privacy

This tool sends the necessary request data to a third-party API or to the endpoint you provide so it can complete the lookup or test.

Provider: User-provided URL.


- Requires login: false
- Requires API key: false
- Stores user data: false


## Examples

- Why does it say blocked without showing the server headers?




## Questions

### Why does it say blocked without showing the server headers?

When CORS blocks a response, the browser hides the response from JavaScript. That is the rule this tool is testing, so sometimes the only honest answer is that the page could not read the details.