HTTP Header Parser | Parse Request & Response Headers

Parse raw HTTP request or response headers into a readable table, JSON structure, and quick audit view for security, caching, and CORS. Designed specifically for developers and professionals, this free online networking runs entirely in your browser to process tasks quickly and securely. Enjoy unlimited usage with no data tracking and no registration required.

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json tools

ssl and security tools

api and http tools

networking

Raw Headers

Mode

response

Headers

Duplicates

Malformed

Request / Status Line

The first line is detected automatically before header parsing starts.

Response

HTTP/1.1 200 OK

Parsed Headers

Date

Sun, 12 Apr 2026 09:31:22 GMT

response

Timestamp when the message was generated.

Content-Type

application/json; charset=utf-8

content

The media type of the payload.

Content-Length

482

content

Response or request body length in bytes.

Cache-Control

public, max-age=300, stale-while-revalidate=60

caching

Caching policy for clients or intermediaries.

ETag

"b7e0d5a"

caching

Version identifier for cache validation.

Strict-Transport-Security

max-age=63072000; includeSubDomains; preload

security

Forces future requests over HTTPS.

Content-Security-Policy

default-src 'self'; img-src 'self' https://images.example.com; object-src 'none'

security

Browser security policy controlling allowed resource sources.

X-Content-Type-Options

nosniff

security

Blocks MIME sniffing when set to nosniff.

X-Frame-Options

DENY

security

Controls whether the page may be framed.

Referrer-Policy

strict-origin-when-cross-origin

security

Controls how much referrer data is sent onward.

Permissions-Policy

camera=(), microphone=()

security

Fine-grained browser feature permissions.

Access-Control-Allow-Origin

https://app.example.com

cors

Custom or less common header.

Vary

Origin, Accept-Encoding

caching

Headers that affect cache differentiation.

Server

edge-cache

response

Server software or edge layer identifier.

About HTTP Header Parser

Parse raw HTTP request or response headers into a readable table, structured JSON, and a lightweight audit view. This is useful when you are debugging API calls, CDN behavior, caching, CORS, or security header coverage.

Key Features

Detects request lines, response status lines, duplicate headers, folded values, and malformed lines.
Groups headers into categories like security, caching, CORS, content, auth, and cookies.
Exports a normalized JSON view that is easy to copy into docs, bug reports, or test fixtures.

Use Cases

Inspect browser, proxy, or server headers copied from DevTools or cURL output.
Check whether important response security headers are present before shipping.
Turn noisy raw header blocks into structured data for debugging and handoff.

Supported Formats

Raw HTTP request headers

Raw HTTP response headers

Normalized JSON

Related Keywords

http header parser

parse request headers

parse response headers

http headers to json

header analyzer

What gets ignored

The parser stops at the blank line that ends the header section. Any body content after that point is ignored and counted separately in the audit tab.

Privacy & Security

All processing happens locally in your browser. Your data never leaves your computer, ensuring complete privacy and security.

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Frequently asked questions

What is HTTP Header Parser used for?

Parse raw HTTP request or response headers into a readable table, JSON structure, and quick audit view for security, caching, and CORS.

Is HTTP Header Parser free to use?

Yes. HTTP Header Parser is completely free with no usage limits, and there is no paid tier required to use it.

Do I need an account to use HTTP Header Parser?

No. HTTP Header Parser works immediately in your browser with no signup, login, or email address required.

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