Hide API Keys in Your Frontend Code

Keep your API keys secure. Corsfix stores your secrets and inserts them server-side, so they never appear in browser code.

fetch('https://proxy.corsfix.com/?<url>', {
  method: 'GET',
  headers: {
    'Authorization': `Bearer sk_abcde...{{API_KEY}}`
  }
});
Used by thousands of developers worldwide, including at these companies
Seaya logo
https://seaya.vc
Taco Bell logo
https://tacobell.com
tuOtempO logo
https://tuotempo.com
Runway logo
https://runwayml.com

API keys stay on the server

Instead of exposing your API key, you can use a variable name that Corsfix will replace with the actual secret. Find more usage details in our secrets documentation.

// Your frontend code (API key hidden)
fetch("https://proxy.corsfix.com/?https://api.example.com/data", {
  headers: {
    "Authorization": "Bearer {{API_KEY}}"
  }
});


// Corsfix inserts the real key server-side
// Your users never see the actual API key

Honestly, working with Corsfix has been incredible, the level of support is top-notch, and using Corsfix has improved the entire user experience for our Figma plugin.

Kyle Conrad's avatar
Kyle Conrad

Lead Product Designer at Taco Bell

I've loved the way you're really trying to satisfy users' requests to make Corsfix an outstanding product. This is the aptitude I really like to see around me and my team.

Emanuele Luchetti's avatar
Emanuele Luchetti

Co-founder and CTO at tuOtempO

I've tried a couple more proxy services but they didn't work as I was expecting, or at all. With that said I was quite surprised at how easy it was to use Corsfix and how well it's documented.

Prem Daryanani's avatar
Prem Daryanani

Web Developer

Frequently Asked Questions

How do I hide my API key in frontend code?

Use Corsfix as your backend proxy to hide API keys in the frontend code. Without a backend proxy, there's no way to truly hide an API key since anything in the browser is accessible to users. Corsfix stores your key server-side and injects it into requests, keeping it hidden from your frontend.

What happens if I use an API key in my frontend?

If you include an API key directly in your frontend code, anyone can view it by inspecting your website's source code or network requests. Attackers can steal your key and make unauthorized requests, potentially costing you money, exhausting rate limits, or breaching sensitive data.

What is frontend?

Frontend refers to the part of a website or app that runs in the user's browser: HTML, CSS, and JavaScript that gets sent to and executed on the client side. Because this code is visible to anyone, sensitive data like API keys should never be stored there.

What are other solutions to hide API keys?

The only real way to hide an API key is to keep it on a backend server. Some suggest using environment variables, but if your code runs client-side, those values are still bundled into your frontend and exposed. You need a server-side solution, either by building your own backend or using a proxy service like Corsfix.

What is Corsfix?

Corsfix is a CORS proxy service that lets you bypass CORS errors and securely fetch APIs that require authentication. With our secrets feature, you can store API keys server-side and reference them in your requests, effectively hiding them from your frontend code.

Is Corsfix secure?

Corsfix encrypts your secrets using layered encryption and only decrypts them at the moment of use. We don't log your request bodies or responses. Learn more about our security model.

Stop exposing your API keys

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