Parse raw HTTP headers into a clean, structured key-value table for easy reading and analysis. When debugging APIs, inspecting network responses, or reviewing server configurations, raw HTTP headers can be difficult to scan in their plain-text format. This tool takes headers copied from browser DevTools, curl output, or server logs and presents them in an organized table with clear name-value pairs. Quickly identify content types, caching directives, security headers, CORS settings, and more without manually parsing each line. All processing runs entirely in your browser — your headers are never sent to any server.
About HTTP Headers Parser
HTTP headers carry metadata about requests and responses — they control caching, define content types, manage authentication, configure CORS policies, and much more. In their raw form (as shown in DevTools or curl output), headers appear as "Name: Value" pairs separated by line breaks, which can be tedious to scan when there are many headers. This parser takes that raw text and organizes it into a structured table where you can quickly locate specific headers. The first line (status line like HTTP/1.1 200 OK or request line like GET /api/data HTTP/1.1) is preserved as context. All parsing happens client-side in your browser — your header data stays on your device. For URL analysis, see our URL Parser.
How to Use HTTP Headers Parser
- Copy raw HTTP headers from browser DevTools (Network tab),
curl -ioutput, server logs, or any other source. - Paste the headers into the Raw headers text area.
- Click Parse headers to generate the structured table.
- Review the parsed headers — each name and value is displayed in its own row for easy scanning and analysis.
Key Features
- Structured table output — Transforms raw header text into a clean, readable name-value table.
- Status/request line detection — Preserves the first line (e.g., HTTP/1.1 200 OK) as contextual information.
- Handles all header formats — Parses request headers, response headers, and multi-value headers correctly.
- Browser-based processing — All parsing runs locally in your browser with zero server interaction.
- Fast scanning — Quickly identify specific headers like Content-Type, Cache-Control, or Authorization in the organized table.
When to Use This Tool
- Debugging API responses by inspecting Content-Type, status codes, and error headers.
- Reviewing security headers (Content-Security-Policy, X-Frame-Options, Strict-Transport-Security) on a website.
- Analyzing CORS configuration by checking Access-Control-Allow-Origin and related headers.
- Verifying caching behavior by examining Cache-Control, ETag, and Expires headers.
- Documenting HTTP interactions for API guides or bug reports.
Technical Details
The parser splits the raw input by line breaks and processes each line. The first line is checked for HTTP status or request line patterns (e.g., HTTP/1.1 200 OK or GET /path HTTP/1.1). Subsequent lines are split on the first colon character to separate the header name from its value, with leading whitespace trimmed from the value. Lines that don't contain a colon (such as continuation lines in folded headers) are appended to the previous header's value. Empty lines signal the end of the header section (in HTTP, an empty line separates headers from the body). The parser handles common edge cases like headers with colons in their values (e.g., URLs in Location headers).
Conclusion
The HTTP Headers Parser turns raw, hard-to-read header text into a structured, scannable table in seconds. It's an essential debugging companion for developers working with APIs, web servers, and network requests — all running privately in your browser.