By capability · Data extraction API

HTML extraction API and structured data extraction API in one call

The short answer

An HTML extraction API turns a web page into the specific fields you need instead of raw HTML. You send a URL and a schema, and it renders the page, finds the values and returns typed JSON. ClawEngine extracts fields like name, price, author or date against a schema you define, renders JavaScript first so client-side content is captured, and returns a clean record ready for a database or pipeline. It runs on public, permitted pages only. Plans start at $39 a month.

Clean markdown & JSON · JavaScript rendered · robots.txt respected

Last updated August 2026

Live Extraction

Endpoint · POST /v1/extract

POST

try:

Hit Extract to turn this page into clean, LLM-ready data.

robots.txt respected · public data only

Markdown · JSON · structured fields, from one API call. Crawling, rendering and extracting ...

Most scraping work is not fetching a page, it is turning that page into the few fields you actually need. A data extraction API should do that part for you. ClawEngine renders a public page, then extracts the data into typed JSON against a schema you define, so you get a clean record instead of a wall of HTML.

Define the fields you want, name, price, author, date, anything on the page, and ClawEngine returns them as structured data ready to drop into a database, a pipeline or an agent. It handles JavaScript-heavy pages, scales without infrastructure on your side, and stays on public, permitted data, respecting robots.txt and Terms of Service throughout.

CRAWL RENDER JS EXTRACT MARKDOWN JSON

Any URL in LLM-ready data out

robots.txt respected public data only

Why it works

What you get with Data extraction API

Schema in, typed data out

Describe the fields you need and ClawEngine returns them as typed JSON, so you get a clean record instead of parsing HTML by hand.

Works on rendered pages

It renders JavaScript before extracting, so data that only appears after the page loads is captured just like static content.

Pipeline-ready output

Structured results drop straight into a database, a warehouse or an agent, with no post-processing step to write and maintain.

What it handles

Any URL in, clean structured data out

Point ClawEngine at a public page and it crawls, renders the JavaScript and extracts clean markdown or typed JSON in one call. Define a schema for structured fields, and respect robots.txt and Terms of Service by default.

Extracts typed fields from any public page
Returns structured JSON against your schema
Renders JavaScript before extracting
Skips boilerplate and irrelevant markup
Scales without parsing infrastructure
Stays on public, permitted data only

POST /v1/extract extraction result

200 · JSON

{
  "url": "https://example.com/products/atlas",
  "title": "Atlas Field Notebook",
  "markdown": "# Atlas Field Notebook\n\nDurable...",
  "data": {
    "name": "Atlas Field Notebook",
    "price": 24.00,
    "currency": "USD",
    "rating": 4.7
  },
  "links": [ "/products", "/cart" ],
  "metadata": { "rendered": true }
}

JS rendered · boilerplate stripped ✓ robots.txt respected

Why ClawEngine

One API that crawls, renders and extracts

Not a raw HTML dump, not a headless browser fleet to run, and not a brittle parser to maintain. One call crawls a public page, renders its JavaScript and returns clean markdown or typed JSON, built for RAG pipelines and AI agents.

LLM-ready output

Clean markdown or typed JSON with the boilerplate stripped, so the data drops straight into a vector store, a prompt or an agent without a cleanup step.

JavaScript rendered

Each page loads in a real browser environment before extraction, so single-page apps and client-rendered content come back complete, not as an empty shell.

Compliance-first

ClawEngine works on public, permitted data only. It respects robots.txt and site Terms of Service and honors crawl-delay, so responsible scraping is the default.

Code examples

Extract typed fields with one call

Send a URL and a schema. ClawEngine renders the page, maps it to your fields and returns typed JSON. No selectors to maintain, no headless browser to run.

curl Extract fields against a schema (POST /v1/extract)

curl https://api.clawengine.ai/v1/extract \
  -H "Authorization: Bearer $CLAWENGINE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "url": "https://example.com/products/atlas",
    "format": "json",
    "schema": {
      "name": "string",
      "price": "number",
      "currency": "string",
      "rating": "number",
      "in_stock": "boolean"
    }
  }'

python Typed record in, straight into your pipeline

import os, requests

r = requests.post(
    "https://api.clawengine.ai/v1/extract",
    headers={"Authorization": f"Bearer {os.environ['CLAWENGINE_API_KEY']}"},
    json={
        "url": "https://example.com/products/atlas",
        "format": "json",
        "schema": {
            "name": "string",
            "price": "number",
            "currency": "string",
            "rating": "number",
        },
    },
)

record = r.json()["data"]
# {'name': 'Atlas Field Notebook', 'price': 24.0, 'currency': 'USD', 'rating': 4.7}
print(record["name"], record["price"])

node Fetch a clean record in Node

const res = await fetch("https://api.clawengine.ai/v1/extract", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.CLAWENGINE_API_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    url: "https://example.com/products/atlas",
    format: "json",
    schema: { name: "string", price: "number", currency: "string" },
  }),
});

const { data } = await res.json();
console.log(data.name, data.price); // Atlas Field Notebook 24

Data extraction API: the questions buyers ask

What is an HTML extraction API?

An HTML extraction API takes a page, or raw HTML you already hold, and returns the meaningful content without the markup around it. Navigation, cookie banners, ad slots and script tags are dropped, and what comes back is either clean text and markdown or the specific typed fields you declared in a schema. The parsing runs on the service side, so no selectors live in your codebase.

What is a content extraction API?

A content extraction API returns the main body of a page, the article or product copy a reader actually came for, separated from the template that surrounds it. It is the lighter half of extraction: you get clean readable content rather than named fields. Reach for a structured extraction API instead when downstream code needs guaranteed keys like price or author rather than prose.

What is a data extraction API?

A data extraction API is a hosted service that turns a web page into structured data through an API call. You send a URL, and optionally a schema describing the fields you want, and it fetches the page, renders any JavaScript, locates the values and returns typed JSON. The point is that parsing, rendering and field mapping happen on the service side, so you get a clean record instead of writing and maintaining a parser per site.

How is a data extraction API different from web scraping?

Scraping usually means pulling a page and getting HTML back, which you then parse yourself. A data extraction API does the parsing too: it returns the specific typed fields you asked for, not markup. So scraping gives you the raw page and extraction gives you the finished data. ClawEngine does both in one call, returning cleaned markdown plus structured JSON mapped to your schema.

Can I define exactly which fields I get back?

Yes. You pass a schema that names each field and its type, and ClawEngine maps the page to it and returns typed JSON in that exact shape. For a product page that might be name, price, currency and rating; for an article, title, author and published date. Every page comes back in the same structure, so your downstream code stays simple and does not break when a site changes its layout.

Does a data extraction API work on JavaScript-heavy sites?

It does when it renders. ClawEngine loads each page in a real browser environment and waits for client-side content to build before it extracts, so single-page apps and data injected after load are captured. An extraction tool that reads only raw HTML returns almost nothing on a modern JavaScript site, which is the most common reason an extraction looks like it ran but produced empty fields.

How much does a data extraction API cost?

It depends on volume and features like rendering. ClawEngine is paid only, with plans starting at $39 a month and scaling by request volume, because the buyer is a team running a real pipeline rather than a one-off consumer. There is no free tier. Rendering, schema extraction and crawling are included rather than sold as separate add-ons, so the price you see covers the whole job.

Is it legal to extract data from a website?

Extracting public web data is broadly lawful in the United States, and US courts have repeatedly declined to treat scraping publicly available data as unauthorized access under the Computer Fraud and Abuse Act. That is not blanket permission: a site's Terms of Service, its robots.txt, copyright and privacy law around personal data all still apply. ClawEngine is built for public, permitted data only and respects robots.txt and Terms of Service. This is general information, not legal advice.

What is a structured extraction API?

A structured extraction API returns data already mapped to a schema you define, rather than returning a document for you to parse. You declare the fields and their types, the service locates each value on the page, and every response arrives in the same shape. The distinction that matters is the contract: a content API promises you the text, a structured extraction API promises you the fields, so downstream code can rely on the keys existing.

What is the best structured data API for AI and agent pipelines?

For agent and RAG work, pick the API whose output needs no cleaning stage: rendered pages, boilerplate stripped, typed JSON with the source URL carried through so a chunk can be cited. Deterministic schema extraction beats asking a model to read raw HTML, because it costs no tokens and cannot hallucinate a value. Reserve LLM-based extraction for messy or frequently changing layouts where a schema genuinely cannot hold.

What is a structured data extraction API?

A structured data extraction API is a hosted endpoint that takes a URL plus a schema and returns typed JSON matching that schema. It renders the page, locates each field you declared, coerces the values to the types you asked for, and hands back one record per page. You are buying a contract on the shape of the output, not just access to the page.

Do structured data extraction APIs handle images and documents?

Web extraction APIs and document extraction tools are different products, and ClawEngine is the first. It returns image URLs, alt text and links to any PDFs it finds on a page, but it does not run OCR or read the inside of a document. If your source is a scanned invoice or a contract PDF rather than a web page, you want a document OCR tool, not a scraping API.

How do I extract structured web data at scale?

Define the schema once, then let the crawler supply the URLs. The failure mode at scale is not extraction, it is queueing: hammering one host, re-fetching pages you already have, and no retry policy when a render times out. Deduplicate by canonical URL, keep one polite queue per host, and store the raw response alongside the parsed record so a schema change does not mean re-crawling everything.

How do I turn messy HTML from a web scraper into clean structured JSON?

Skip the intermediate step. Instead of scraping HTML and then writing a parser, send the URL and a field schema to an extraction API that renders the page and returns typed JSON directly. If you already hold the HTML, strip boilerplate first, then map the remaining content to your schema. Parsing raw markup with selectors works until the site redesigns, which is why schema extraction at fetch time is the more durable pattern.

Good questions

Questions about Data extraction API

You define a schema, the fields you want and their types, and ClawEngine maps the page to it, returning typed JSON. If you only need the cleaned content, you can also take markdown or a generic JSON object with title, body, links and metadata.

Yes. ClawEngine renders the page in a real browser environment before extracting, so fields that appear only after scripts run are captured. It targets public, permitted pages and respects robots.txt and Terms of Service.

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Stop wrangling raw HTML. Get LLM-ready data.

Point ClawEngine at a public page and one call crawls, renders the JavaScript and extracts clean markdown or typed JSON, ready for your RAG pipeline or AI agent. Public, permitted data only.

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Crawl · render JS · extract markdown & JSON · robots.txt respected, public data only