Structured web data extraction and validation

Get structured fields from a page without claiming that extraction alone makes the data complete or correct.

From page content to JSON

Request JSON with json.prompt or json.schema. A schema describes the desired structure; your application must still check the response, field types and source evidence before using it.

curl https://api.oassis.dev/web/v1/scrape \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"url":"https://example.com/product","formats":["json"],"json":{"prompt":"Extract the displayed product name, price and currency. Use null for missing values. Do not infer availability.","schema":{"type":"object","properties":{"name":{"type":["string","null"]},"price":{"type":["number","null"]},"currency":{"type":["string","null"]}},"required":["name","price","currency"]}}}'

What cleaning means in this workflow

Validate before storing

// Example application-side checks after inspecting the API's errors/data.
function validateProduct(value) {
  if (!value || typeof value !== 'object') throw new Error('Missing product');
  if (value.price !== null &&
      (typeof value.price !== 'number' || !Number.isFinite(value.price) || value.price < 0)) {
    throw new Error('Invalid price');
  }
  if (value.currency !== null &&
      (typeof value.currency !== 'string' || !/^[A-Z]{3}$/.test(value.currency))) {
    throw new Error('Currency requires review');
  }
  return value;
}

For full JSON Schema validation use a validator in your application. Record source URL, capture time and selected variant alongside accepted data. A missing price is not zero and a failed page read is not an out-of-stock product.

Cost and limitations

A fresh JSON output costs $0.005. Additional outputs add to that price. Oassis does not promise a separate built-in data cleaning or factual verification service.

Try Scrape & Map · API quick start · Estimate your cost

Oassis basic fresh Markdown extraction: $0.002 per page output. All operation prices and calculator.