Raw headers are hard to scan
The parser separates names, values, duplicates, Cookie pairs, Set-Cookie attributes, and malformed lines so copied debugging output becomes readable.
Developer Tool
HTTP Header Parser Parse headers, cookies, CORS, CSP, and security signals
HTTP Header Parser turns headers copied from DevTools, Postman, curl, server logs, or packet captures into structured rows, cookie details, Authorization hints, CORS/CSP findings, and safe exports without sending data anywhere.
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HTTP Header Parser problems it solves
HTTP Header Parser helps developers and site owners understand copied headers without online scanning, backend proxying, or saving pasted data.
Secrets are easy to leak
It masks Authorization, Cookie, Set-Cookie, token, session, and key-like values by default before you copy JSON or cleaned headers.
Security headers need context
It flags broad CORS, unsafe-inline CSP, missing HSTS, and common security headers while reminding you that static checks are only a first pass.
HTTP Header Parser features
HTTP Header Parser combines structured parsing, static security checks, safe exports, and browser-only processing for everyday API debugging.
Header and duplicate parsing
The parser handles request headers, response headers, browser DevTools copies, Postman snippets, curl -H lines, and server log fragments.
Cookie and Set-Cookie details
It extracts Cookie name/value pairs plus Set-Cookie Domain, Path, Expires, Max-Age, Secure, HttpOnly, and SameSite attributes.
Authorization recognition
It recognizes Bearer token placeholders and Basic Auth structure while keeping the actual value hidden unless you choose to reveal it.
CORS and CSP review
It highlights Access-Control-Allow-Origin, Access-Control-Allow-Credentials, Content-Security-Policy, and unsafe-inline patterns.
Security header signals
It checks Strict-Transport-Security, X-Frame-Options, Referrer-Policy, and Permissions-Policy for quick triage.
Copy and download exports
It copies structured JSON, copies cleaned headers, and downloads a TXT result for tickets, audits, and debugging notes.
How to use HTTP Header Parser
Use HTTP Header Parser as a local first-pass reader before sharing headers in tickets, docs, chats, or audits.
01
Paste copied headers
Paste Request Headers, Response Headers, Cookie, Set-Cookie, Authorization, CORS, CSP, DevTools, Postman, curl, or server log text into the parser.
Open parser 02
Review structure and warnings
Check parsed header names, merged duplicates, Cookie fields, Set-Cookie missing attributes, malformed lines, and security findings.
Open parser 03
Keep sensitive values hidden
Leave masking enabled before copying structured JSON, cleaned headers, or TXT output if real tokens, sessions, or cookies are present.
Open parser 04
Validate with context
Use static CORS, CSP, and security header signals as triage, then confirm behavior in your actual server and business configuration.
Open parserHTTP Header Parser workflows
This tool focuses on fast local comprehension instead of scanning remote sites or storing pasted headers.
Turn copied headers into tables
Paste mixed request and response headers into the tool and get structured names, values, line numbers, duplicates, and abnormal lines.
Inspect Cookie and Authorization safely
The tool breaks down Cookie and Set-Cookie fields, shows missing Secure, HttpOnly, SameSite, Domain, or Path attributes, and masks Authorization content.
Triage CORS, CSP, and security headers
The tool surfaces broad CORS, unsafe-inline CSP, missing HSTS, and common policy headers so teams know what to verify next.
HTTP Header Parser use cases
HTTP Header Parser complements the JWT Decoder, URL tools, and Base64 tools by focusing on headers, cookies, CORS, CSP, and security policies.
Frontend API debugging
Use it to understand browser Request Headers, Response Headers, CORS results, Cookie behavior, and cache headers before opening a backend ticket.
Backend and API support
Use it to clean log snippets, inspect Authorization headers, merge duplicate headers, and share structured JSON with teammates.
Site owner security checks
Use it to review CSP, HSTS, X-Frame-Options, Referrer-Policy, Permissions-Policy, and cookie attributes before deeper testing.
Related developer tools
After parsing headers, open the JWT Decoder for JWT payloads, URL Master for query strings, or Base64 Decoder for encoded payload fragments.
HTTP Header Parser FAQ
Common questions about what HTTP Header Parser does and does not do.
Does HTTP Header Parser send my headers to a server?
No. This is a pure front-end parser. It does not request the target website, use an online scanner, proxy traffic, or save pasted data.
Can HTTP Header Parser prove my CORS or CSP configuration is secure?
No. The tool uses static rules to highlight broad CORS, unsafe-inline CSP, missing HSTS, and common policy headers. Final safety must be judged with real business behavior and server configuration.
Why are Cookie and Authorization values hidden?
The tool hides sensitive values by default because real headers can contain session cookies, bearer tokens, API keys, and credentials that should not be shared publicly.
How is HTTP Header Parser different from JWT Decoder or Base64 tools?
This tool focuses on HTTP header names, values, cookies, Authorization structure, CORS, CSP, and security headers. JWT Decoder focuses on JWT payloads, URL tools focus on URLs, and Base64 tools focus on encoding and decoding.
Start using HTTP Header Parser
Paste copied headers into the tool, keep sensitive values hidden, and turn messy debugging text into structured results you can inspect, copy, or download.