Cookie Header Parser
HTTP cookies
Cookie Parser
Parse a Cookie or Set-Cookie header into readable key-value rows.
| Name | Value |
|---|---|
| session | abc123 |
| theme | dark |
| Path | / |
| Secure | true |
| HttpOnly | true |
| SameSite | Lax |
Usage guide
Break Cookie and Set-Cookie headers into fields you can inspect
HTTP cookie headers are compact strings with names, values, and attributes that affect scope, expiration, cross-site behavior, and transport security. Parsing them into readable fields makes debugging browser and server behavior easier.
How to use Cookie Parser
- 1.Paste the relevant Cookie or Set-Cookie header from a safe development environment.
- 2.Review the cookie name and value separately from attributes such as Path, Domain, Secure, HttpOnly, SameSite, and expiry.
- 3.Compare the parsed attributes with the behavior expected by your application and browser.
Examples
- Check whether a session cookie is missing Secure before testing it over HTTPS.
- Inspect SameSite when a login flow behaves differently after a cross-site redirect.
- Compare Path values when a cookie is sent to one route but not another.
Limitations and notes
- Real session cookies and authentication tokens are sensitive credentials; redact them before sharing debugging output.
- Browser cookie behavior also depends on origin, HTTPS, privacy controls, and evolving browser policies.
What is the difference between Cookie and Set-Cookie?
Servers send Set-Cookie to instruct the browser to store a cookie, while browsers send Cookie headers back on eligible requests.
Why can JavaScript not read an HttpOnly cookie?
HttpOnly is designed to keep the cookie inaccessible to client-side JavaScript, reducing exposure to some script-based attacks.
For transparency, review Tool Nova's data source policy and editorial policy.
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How the cookie parser works
Paste or enter the code, data, or value you want to inspect.
The tool processes it locally in your browser.
Copy the formatted output or converted value for your project.
Frequently Asked Questions
Is the cookie parser free?
Yes. It is free and does not require an account.
Is my code sent to a server?
No. These developer tools run locally in your browser.
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