HTTP Headers Parser
Parse raw HTTP headers into a structured list.
HTTP Headers Parser turns a raw pasted HTTP request or response header block into a structured, readable name/value list entirely in your browser. Use it to quickly inspect API responses, debug CORS issues, or review request headers without uploading anything.
How it works
The parser splits the pasted text into lines, detects an optional leading status or request line, then splits each remaining line on its first colon into a header name and value. Known sensitive header names like Authorization and Cookie are flagged in the output.
Benefits
- Client-only parsing—no headers leave your browser
- Handles an optional status/request start line automatically
- Flags common sensitive header names for awareness
- Preserves duplicate headers like repeated Set-Cookie lines
Use cases
- Inspect a copied cURL or browser DevTools response quickly
- Debug missing or misconfigured CORS headers
- Review request headers shared in a support ticket
- Teach how HTTP header blocks are structured
Best practices
- Redact real Authorization, Cookie, and API-key values before sharing pasted headers with others
- Use DevTools' raw header view when copying to preserve exact formatting
- Cross-check flagged sensitive headers before pasting into shared documents
- Treat this as a readability aid, not a conformance validator
Common mistakes
- Pasting headers with the response body still attached, causing parse errors
- Assuming this tool validates headers against HTTP specifications
- Sharing pasted output that still contains live session cookies or tokens
- Confusing a folded (multi-line) header value with a new header line
Privacy
Parsing runs locally using string operations only—no network calls are made and headers are not sent to ToolHub. Because pasted headers can contain credentials, this tool is marked sensitive and history requires explicit opt-in.
Frequently asked questions
- What input format does HTTP Headers Parser expect?
- Paste a raw HTTP request or response block: an optional start line (like "HTTP/1.1 200 OK" or "GET /path HTTP/1.1") followed by one "Name: value" header per line.
- Does this tool send my headers to a server?
- No. Parsing happens entirely in your browser using string splitting—no network request is made and headers are not uploaded to ToolHub.
- Is it safe to paste production authorization headers here?
- Avoid pasting live production Authorization, Cookie, or API-key headers when possible. This tool flags known sensitive header names, but you should redact real credentials before sharing screenshots or logs.
- Can it handle duplicate headers like multiple Set-Cookie lines?
- Yes. Each header line is parsed independently and shown in order, so repeated header names (common with Set-Cookie) all appear in the structured list.
- What happens with a malformed header line?
- If a non-empty line has no colon separator, the tool reports a parse error naming the offending line so you can fix the pasted text.
- Does it validate header values against HTTP specs?
- No. This is a lightweight structural parser for readability, not a strict RFC 7230/9110 validator. Use it for quick inspection, not conformance testing.
- Can I copy the parsed headers back out?
- Yes. Use Copy or Download to export the parsed start line and headers as plain text once parsing succeeds.
Related tools
Security Headers Analyzer
security
Check for missing common security response headers.
- security-headers
- csp
- hsts
- http
JWT Decoder
security
Inspect JWT header and payload locally—no signature verify.
- jwt
- token
- decode
- security
Password Strength Checker
security
Local entropy and checklist-based password strength check.
- password
- security
- strength
- entropy
PEM Decoder
security
Inspect PEM structure and Base64 body locally.
- pem
- certificate
- csr
- x509
Unsigned JWT Builder
security
Build unsigned JWTs for learning—never for production.
- jwt
- security
- education
- alg-none
Caesar Cipher
security
Adjustable-shift Caesar cipher, encode and decode.
- caesar
- cipher
- encode
- decode