Cookie Parser Free Online Tool 2026

Last updated March 22, 2026

Cookie Parser Examples

The Cookie Parser breaks down raw cookie strings into their individual components, explaining each attribute and flagging security issues. Below are examples of parsed cookies and what the output looks like.

Parsing a Session Cookie Header

Input (raw Set-Cookie header):

Set-Cookie: sessionId=abc123xyz; Path=/; Secure; HttpOnly; SameSite=Lax; Max-Age=3600

Parsed output:

Name:      sessionId
Value:     abc123xyz

Attributes:
  Path:       /
  Max-Age:    3600 (expires in 1 hour)
  Secure:     ✓ Yes — only sent over HTTPS
  HttpOnly:   ✓ Yes — not accessible via JavaScript
  SameSite:   Lax — sent on top-level navigation, blocked on cross-site sub-requests

Security Assessment: GOOD
  ✓ Secure flag present
  ✓ HttpOnly flag present
  ✓ SameSite policy set

Parsing a Cookie with Security Issues

Input:

Set-Cookie: userToken=eyJhbGciOiJIUzI1NiJ9.abc.xyz; Path=/; Expires=Thu, 01 Jan 2026 00:00:00 GMT

Parsed output:

Name:      userToken
Value:     eyJhbGciOiJIUzI1NiJ9.abc.xyz (looks like a JWT token)
Decoded:   { "alg": "HS256" } . { ... } . [signature]

Attributes:
  Path:       /
  Expires:    Thu, 01 Jan 2026 00:00:00 GMT (expires in ~9 months)

Security Assessment: WARNINGS
  ✗ Missing Secure flag — cookie will be sent over HTTP (plaintext)
  ✗ Missing HttpOnly flag — accessible via JavaScript (XSS risk)
  ✗ Missing SameSite attribute — defaults to browser behavior (CSRF risk)

Parsing a document.cookie String

Input (from browser console):

theme=dark; lang=en-US; sessionId=abc123; _ga=GA1.2.123456789.1700000000

Parsed output (multiple cookies):

Cookie 1:
  Name:  theme
  Value: dark

Cookie 2:
  Name:  lang
  Value: en-US

Cookie 3:
  Name:  sessionId
  Value: abc123

Cookie 4:
  Name:  _ga
  Value: GA1.2.123456789.1700000000
  Note:  Google Analytics tracking cookie

Parsing a Cookie with URL-Encoded Value

Input:

Set-Cookie: redirect=%2Fdashboard%2Fsettings%3Ftab%3Dprofile; Path=/; SameSite=Lax

Parsed output:

Name:          redirect
Raw Value:     %2Fdashboard%2Fsettings%3Ftab%3Dprofile
Decoded Value: /dashboard/settings?tab=profile

Attributes:
  Path:      /
  SameSite:  Lax

Parsing a SameSite=None Cookie

Input:

Set-Cookie: widgetToken=tok_abc; Path=/; Secure; SameSite=None; Max-Age=86400

Parsed output:

Name:      widgetToken
Value:     tok_abc

Attributes:
  Path:      /
  Max-Age:   86400 (expires in 24 hours)
  Secure:    ✓ Yes
  SameSite:  None — sent with all cross-site requests

Note: SameSite=None requires Secure. Secure is present — valid configuration.
Use case: Embedded widgets, cross-origin iframes, third-party integrations.

Parsing an Expired Cookie

Input:

Set-Cookie: oldSession=xyz; Expires=Mon, 01 Jan 2024 00:00:00 GMT; Path=/

Parsed output:

Name:      oldSession
Value:     xyz

Attributes:
  Path:     /
  Expires:  Mon, 01 Jan 2024 00:00:00 GMT

Status: EXPIRED — this cookie expired 2 years ago.
         Setting this cookie will immediately delete it from the browser.

Security Audit Checklist

The parser evaluates each cookie against these security criteria:

• Secure flag — required for any cookie containing sensitive data
• HttpOnly flag — required for session and auth cookies to prevent XSS theft
• SameSite attribute — should be Strict or Lax for most cookies
• Expiration — session cookies should not have long-lived expiry
• Domain scope — avoid overly broad domain settings
• Path scope — restrict to the minimum necessary path

Common Use Cases

• Debugging authentication and session cookie issues
• Auditing cookie security attributes in web applications
• Understanding cookies set by third-party scripts
• Comparing cookies across development and production environments
• Building GDPR/CCPA cookie consent disclosures
• Learning about cookie security attributes and their effects

Paste any raw Set-Cookie header or document.cookie string to instantly see a structured breakdown with security assessment and attribute explanations.