---
title: Validate HTML API
slug: validate-html
url: https://apyhub.com/chisleroff/service/validate-html
provider: Website Intelligence
categories: [Developer Tools, SEO]
tags: [html-validation, structured-data, seo, schema-markup, metadata-audit]
auth: api_key
---

# Validate HTML API

Validate raw HTML for JSON-LD, microdata, meta tags, Open Graph, and Twitter cards. Get a summary of warnings, errors, and rich result eligibility.

## Endpoints

| Method | Path | Description | Atoms |
| --- | --- | --- | --- |
| POST | `/chisleroff/seo/validate-html` | What it does Validates the structured data found in raw HTML content. It accepts an HTML string in… | 50 |

## About

## What it does
HTML Validator checks a page’s markup for structured data and related SEO signals. Send raw HTML in the `html` field, and get back the detected structured-data and metadata objects the page exposes.

Use it to audit pages before release, spot missing or malformed schema markup, and confirm that search engines can read the signals you intend to publish. The response includes the page `url` when available, plus `json_ld`, `microdata`, `meta_tags`, `open_graph`, and `twitter_card` data extracted from the HTML.

The `summary` object gives you a quick read on what was found: `warnings`, `critical_errors`, `overall_score`, `total_entities`, `types_found`, and `rich_results_eligible`. That makes it useful for automated QA in CI, content checks in CMS workflows, or bulk review of landing pages after template changes.

If you work on technical SEO or structured data, HTML Validator gives you a compact way to inspect what’s actually present in the document without parsing it yourself.

## Usage

Authenticate with an ApyHub API key in the `apy-token` header.
Full docs and a live playground: https://apyhub.com/chisleroff/service/validate-html