Website SEO Tech and Header Audit API

API ID 13595

Audit one public page for static SEO signals, 65+ technology fingerprints, and eight security headers with bounded redirects, response size, and private-network blocking.

83 ms avg response

API Documentation

Endpoints

Request
Analyze one public HTML page for deterministic static SEO findings, more than 65 technology fingerprints, and eight security-header checks without browser rendering or private-network access.
Endpoint ID: 30325
POST https://zylalabs.com/api/13595/website+seo+tech+and+header+audit+api/30325/audit+a+public+web+page
INPUT PARAMETERS

Audit a public web page — Endpoint Features

Object Description
Request Body Required Json

Free test requests remaining: 3 of 3.


INPUT PARAMETERS

API EXAMPLE RESPONSE
JSON
{
    "requestId": "46cd4f3d-38c3-4840-8ee5-820a4c0efd53",
    "result": {
        "inputUrl": "https://example.com/",
        "normalizedUrl": "https://example.com/",
        "finalUrl": "https://example.com/",
        "httpStatus": 200,
        "contentType": "text/html",
        "redirectCount": 0,
        "responseBytes": 559,
        "seo": {
            "score": 68,
            "grade": "D",
            "severityCounts": {
                "critical": 0,
                "error": 1,
                "warning": 8,
                "info": 0
            },
            "snapshot": {
                "title": "Example Domain",
                "titleLength": 14,
                "description": null,
                "descriptionLength": 0,
                "canonical": null,
                "robots": null,
                "lang": "en",
                "viewportMeta": true,
                "h1Count": 1,
                "headingOrderSkips": 0,
                "wordCount": 21,
                "imageCount": 0,
                "imagesMissingAlt": 0,
                "jsonLdBlocks": 0,
                "jsonLdInvalid": 0,
                "openGraphTags": 0
            },
            "issues": [
                {
                    "id": "canonical-missing",
                    "category": "indexability",
                    "severity": "warning",
                    "message": "No canonical URL was found.",
                    "evidence": null,
                    "recommendation": "Add an absolute canonical URL for the preferred page."
                },
                {
                    "id": "title-length",
                    "category": "metadata",
                    "severity": "warning",
                    "message": "The title length is outside the usual descriptive range.",
                    "evidence": 14,
                    "recommendation": "Use a concise title of roughly 15 to 65 characters."
                },
                {
                    "id": "description-missing",
                    "category": "metadata",
                    "severity": "error",
                    "message": "The meta description is missing.",
                    "evidence": null,
                    "recommendation": "Add a useful page summary."
                },
                {
                    "id": "thin-static-copy",
                    "category": "content",
                    "severity": "warning",
                    "message": "The returned HTML contains little text.",
                    "evidence": 21,
                    "recommendation": "Confirm the page provides enough useful crawlable content."
                },
                {
                    "id": "open-graph-incomplete",
                    "category": "metadata",
                    "severity": "warning",
                    "message": "Core Open Graph metadata appears incomplete.",
                    "evidence": 0,
                    "recommendation": "Add intentional Open Graph title, description, type, and URL values where sharing matters."
                },
                {
                    "id": "hsts-missing",
                    "category": "security",
                    "severity": "warning",
                    "message": "Strict-Transport-Security was not observed.",
                    "evidence": false,
                    "recommendation": "Consider HSTS after confirming HTTPS coverage."
                },
                {
                    "id": "csp-missing",
                    "category": "security",
                    "severity": "warning",
                    "message": "Content-Security-Policy was not observed.",
                    "evidence": false,
                    "recommendation": "Add a tested CSP appropriate to the application."
                },
                {
                    "id": "frame-protection-missing",
                    "category": "security",
                    "severity": "warning",
                    "message": "No framing protection was observed.",
                    "evidence": false,
                    "recommendation": "Define an intentional framing policy."
                },
                {
                    "id": "nosniff-missing",
                    "category": "security",
                    "severity": "warning",
                    "message": "X-Content-Type-Options: nosniff was not observed.",
                    "evidence": false,
                    "recommendation": "Add the nosniff response header."
                }
            ]
        },
        "technologies": [
            {
                "name": "Cloudflare",
                "category": "cdn",
                "evidence": [
                    "header:server",
                    "header:cf-ray"
                ]
            }
        ],
        "technologyNames": [
            "Cloudflare"
        ],
        "technologyCategories": [
            "cdn"
        ],
        "securityHeaders": {
            "strictTransportSecurity": false,
            "contentSecurityPolicy": false,
            "clickjackingProtection": false,
            "contentTypeOptions": false,
            "referrerPolicy": false,
            "permissionsPolicy": false,
            "crossOriginOpenerPolicy": false,
            "crossOriginResourcePolicy": false,
            "presentCount": 0,
            "assessedCount": 8,
            "missing": [
                "strict-transport-security",
                "content-security-policy",
                "clickjacking-protection",
                "x-content-type-options",
                "referrer-policy",
                "permissions-policy",
                "cross-origin-opener-policy",
                "cross-origin-resource-policy"
            ]
        },
        "evidenceBoundary": "Detections are evidence-based fingerprints from the fetched public response, not a guarantee of the complete server-side stack or technology version. Static HTML evidence is not browser-rendered content, a Lighthouse score, Google Search ranking data, a penetration test, or a guarantee of indexing or ranking."
    }
}
Audit a public web page — CODE SNIPPETS

curl --location --request POST 'https://zylalabs.com/api/13595/website+seo+tech+and+header+audit+api/30325/audit+a+public+web+page' --header 'Authorization: Bearer YOUR_API_KEY' 

--data-raw '{"url":"https://example.com/","options":{"timeoutMs":10000,"maxResponseBytes":500000,"maxRedirects":3}}'

    

API Access Key & Authentication

After signing up, every developer is assigned a personal API access key, a unique combination of letters and digits provided to access to our API endpoint. To authenticate with the Website SEO Tech and Header Audit API simply include your bearer token in the Authorization header.

Headers
Header Description
Authorization Required Should be Bearer access_key. See "Your API Access Key" above when you are subscribed.

No long-term commitment. Upgrade, downgrade, or cancel anytime. Free Trial includes up to 50 requests.

(Save 2 months with annual billing 🎉)

🚀 Enterprise Plan

Starts at
$ 10,000/Year


  • Custom Volume
  • Custom Rate Limit
  • Specialized Customer Support
  • Real-Time API Monitoring

Overview

Audit one public page for static SEO signals, 65+ technology fingerprints, and eight security headers with bounded redirects, response size, and private-network blocking.

Website SEO Tech and Header Audit API FAQs

The API returns data related to static SEO signals, technology fingerprints, and security headers. This includes the HTTP status, content type, redirect count, response size, and a detailed SEO score with severity counts for issues found.

Key fields in the response include `inputUrl`, `httpStatus`, `seo.score`, `seo.grade`, and `seo.severityCounts`. These provide insights into the page's SEO performance and any issues detected during the audit.

The response data is structured in a JSON format, with a top-level object containing `requestId` and `result`. The `result` object includes details about the URL, HTTP status, response size, and a nested `seo` object with specific SEO findings.

The API provides information on SEO performance, technology used on the page, and security headers. It includes metrics like SEO score, redirect counts, and specific issues categorized by severity (critical, error, warning, info).

The primary parameter for the endpoint is the `inputUrl`, which specifies the public web page to be audited. Users can customize their requests by providing different URLs to analyze various pages.

Data accuracy is maintained through deterministic analysis of the HTML content without browser rendering. The API uses established algorithms to evaluate SEO signals and technology fingerprints, ensuring reliable results.

Typical use cases include website audits for SEO optimization, technology stack identification, and security assessments. Webmasters and SEO professionals can use the data to improve site performance and compliance with best practices.

Users can analyze the SEO score and severity counts to prioritize fixes. The detailed findings, such as missing meta tags or security headers, guide users in enhancing their web pages for better search engine visibility and security.

General FAQs

To obtain your API key, first sign in to your account and navigate to the API you want to use. From the API's Pricing section, choose a plan and complete the subscription process. Once subscribed, return to the API page and you will see your API Access Key displayed at the top of the documentation page. You can use this key to authenticate your requests.

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