high severity

How to Fix: CORS Error on Localhost

Your browser blocks requests from localhost to your API because of Cross-Origin Resource Sharing (CORS) policy restrictions.

cors error localhostaccess-control-allow-origincors policy blockfix cors error

Symptoms

Console shows 'Access-Control-Allow-Origin' error

Network requests fail with status (blocked)

Works in Postman but not in browser

Common Causes

01

API server missing CORS headers

02

Incorrect origin specified in CORS config

03

Preflight OPTIONS request being blocked

The DevConsole Solution

DevConsole can intercept and modify request headers, allowing you to bypass CORS restrictions during local development without changing your server configuration.

Step-by-Step Fix

1

Open DevConsole Network Tab

Navigate to the Network panel in DevConsole.

2

Enable CORS Override

Toggle the 'Override CORS' option for your requests.

3

Test Your Request

Re-run your API call and see it succeed without CORS errors.

Get DevConsoleDocumentation

Frequently Asked Questions

Why does this only happen in the browser?

CORS is a browser security feature. Tools like Postman or cURL don't enforce it because they're not browsers.

Should I disable CORS in production?

Never. CORS protects your users. DevConsole's override is for local development only.

Helpful Tools

HTTP Header Analyzer

Free HTTP header analyzer. Analyze and understand HTTP headers.

cURL Converter

Free cURL converter. Convert cURL to fetch, axios, and other formats.

Related Problems

401 Unauthorized Error

Your API returns 401 Unauthorized, meaning the server doesn't recognize your credentials or your token has expired.

Stop debugging blindly

DevConsole gives you the visibility and control to fix issues like cors error on localhost in seconds, not hours.

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