stableflare.dev Web-to-JSON Extractor

x402

stableflare.dev Web-to-JSON Extractor is a paid API for AI agents from stableflare.dev, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).

Extracts structured JSON data from any URL by rendering the page and applying a natural language prompt or JSON schema to define the output shape

Price / call$0.05

Seller volume →—

Success—

StatusUnknown

How this service works

Extract structured data from any URL using AI. Provide a natural language prompt or JSON schema to define the output shape.

Output

A structured JSON object or array whose shape is defined by the provided prompt or schema, containing the extracted data from the rendered webpage at the given URL.

Example use cases

Example prompt

“Go to https://news.ycombinator.com and extract the top 10 stories as structured JSON — I want each item to have a title, URL, points, and comment count.”

Technical details

Endpoint

POSThttps://stableflare.dev/api/browser/json

When to prefer

Choose this endpoint when you need to extract structured, machine-readable data from a live webpage and want to define the output shape using plain English or a JSON schema. It is ideal for turning arbitrary web content into typed objects without writing custom parsers. Prefer it over screenshot or markdown endpoints when the downstream need is structured data rather than visual content or raw text.

Side effects

URL is unreachable or returns an error — extraction fails with a fetch/navigation error
Prompt or schema is too ambiguous — output may be incomplete or misaligned with expectations
Page requires authentication or CAPTCHA — content may be inaccessible
JavaScript-heavy pages may time out before fully rendering
Rate limiting or bot-detection on target site may block extraction
Malformed JSON schema input causes a 400 validation error

Input

{
  "url": "https://news.ycombinator.com",
  "prompt": "Extract the top 10 stories from this page. For each story, provide the title, the URL (if available), the points/score, and the number of comments.",
  "gotoOptions": {
    "timeout": 30000,
    "waitUntil": "networkidle2"
  },
  "response_format": {
    "type": "json_schema",
    "schema": {
      "type": "object",
      "required": [
        "stories"
      ],
      "properties": {
        "stories": {
          "type": "array",
          "items": {
            "type": "object",
            "required": [
              "title",
              "points",
              "comments"
            ],
            "properties": {
              "url": {
                "type": "string"
              },
              "title": {
                "type": "string"
              },
              "points": {
                "type": "number"
              },
              "comments": {
                "type": "number"
              }
            }
          }
        }
      }
    }
  }
}

Schema · Request body

Field	Type	Description
url	string	URL to render
html	string	HTML content to render instead of URL
prompt	string	Natural language prompt for AI extraction
cookies	array
userAgent	string
gotoOptions	object
authenticate	object
response_format	object	JSON schema for structured extraction
waitForSelector	string	CSS selector to wait for
setExtraHTTPHeaders	object

Output

{
  "result": {
    "stories": [
      {
        "url": "https://obeli.sk/blog/sqlite-is-all-you-need-for-durable-workflows/",
        "title": "SQLite is all you need for durable workflows",
        "points": 270,
        "comments": 158
      },
      {
        "url": "https://www.owenmcgrann.com/p/the-dead-economy-theory",
        "title": "The dead economy theory",
        "points": 537,
        "comments": 717
      },
      {
        "url": "https://koenvangilst.nl/lab/mistral-ai-now-summit",
        "title": "Notes from the Mistral AI Now Summit in Paris",
        "points": 284,
        "comments": 92
      },
      {
        "url": "https://pierre.computer/writing/on-rendering-diffs",
        "title": "On Rendering Diffs",
        "points": 115,
        "comments": 30
      },
      {
        "url": "https://www.theverge.com/ai-artificial-intelligence/939765/ai-training-data-startup-shift-free-cleaning",
        "title": "Shift will clean homes for free to train future robots",
        "points": 47,
        "comments": 70
      },
      {
        "url": "https://github.com/jmaczan/tiny-vllm",
        "title": "Show HN: Tiny-vLLM – high performance LLM inference engine in C++ and CUDA",
        "points": 55,
        "comments": 7
      },
      {
        "url": "http://hypercritical.co/2026/05/29/ev-stupidity-checklist",
        "title": "EV Stupidity Checklist",
        "points": 60,
        "comments": 46
      },
      {
        "url": "https://www.inkandswitch.com/tangents/bijou64/",
        "title": "Bijou64: A variable-length integer encoding",
        "points": 195,
        "comments": 70
      },
      {
        "url": "https://www.invenglobal.com/articles/22330/stop-killing-games-movement-gains-momentum-california-assembly-passes-game-protection-bill",
        "title": "The California state assembly has passed the 'Protect Our Games Act'",
        "points": 142,
        "comments": 136
      },
      {
        "url": "https://www.jeffgeerling.com/blog/2026/its-hard-to-justify-framework-12/",
        "title": "It's hard to justify buying a Framework 12",
        "points": 177,
        "comments": 327
      },
      {
        "url": "https://www.liquid.ai/blog/lfm2-5-8b-a1b",
        "title": "Liquid AI reveals 8B-A1B MoE trained on 38T",
        "points": 122,
        "comments": 37
      }
    ]
  },
  "success": true
}

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Technical details

Endpoint

POSThttps://stableflare.dev/api/browser/json

When to prefer

Side effects

URL is unreachable or returns an error — extraction fails with a fetch/navigation error
Prompt or schema is too ambiguous — output may be incomplete or misaligned with expectations
Page requires authentication or CAPTCHA — content may be inaccessible
JavaScript-heavy pages may time out before fully rendering
Rate limiting or bot-detection on target site may block extraction
Malformed JSON schema input causes a 400 validation error

Input

{
  "url": "https://news.ycombinator.com",
  "prompt": "Extract the top 10 stories from this page. For each story, provide the title, the URL (if available), the points/score, and the number of comments.",
  "gotoOptions": {
    "timeout": 30000,
    "waitUntil": "networkidle2"
  },
  "response_format": {
    "type": "json_schema",
    "schema": {
      "type": "object",
      "required": [
        "stories"
      ],
      "properties": {
        "stories": {
          "type": "array",
          "items": {
            "type": "object",
            "required": [
              "title",
              "points",
              "comments"
            ],
            "properties": {
              "url": {
                "type": "string"
              },
              "title": {
                "type": "string"
              },
              "points": {
                "type": "number"
              },
              "comments": {
                "type": "number"
              }
            }
          }
        }
      }
    }
  }
}

Schema · Request body

Field	Type	Description
url	string	URL to render
html	string	HTML content to render instead of URL
prompt	string	Natural language prompt for AI extraction
cookies	array
userAgent	string
gotoOptions	object
authenticate	object
response_format	object	JSON schema for structured extraction
waitForSelector	string	CSS selector to wait for
setExtraHTTPHeaders	object

Output

{
  "result": {
    "stories": [
      {
        "url": "https://obeli.sk/blog/sqlite-is-all-you-need-for-durable-workflows/",
        "title": "SQLite is all you need for durable workflows",
        "points": 270,
        "comments": 158
      },
      {
        "url": "https://www.owenmcgrann.com/p/the-dead-economy-theory",
        "title": "The dead economy theory",
        "points": 537,
        "comments": 717
      },
      {
        "url": "https://koenvangilst.nl/lab/mistral-ai-now-summit",
        "title": "Notes from the Mistral AI Now Summit in Paris",
        "points": 284,
        "comments": 92
      },
      {
        "url": "https://pierre.computer/writing/on-rendering-diffs",
        "title": "On Rendering Diffs",
        "points": 115,
        "comments": 30
      },
      {
        "url": "https://www.theverge.com/ai-artificial-intelligence/939765/ai-training-data-startup-shift-free-cleaning",
        "title": "Shift will clean homes for free to train future robots",
        "points": 47,
        "comments": 70
      },
      {
        "url": "https://github.com/jmaczan/tiny-vllm",
        "title": "Show HN: Tiny-vLLM – high performance LLM inference engine in C++ and CUDA",
        "points": 55,
        "comments": 7
      },
      {
        "url": "http://hypercritical.co/2026/05/29/ev-stupidity-checklist",
        "title": "EV Stupidity Checklist",
        "points": 60,
        "comments": 46
      },
      {
        "url": "https://www.inkandswitch.com/tangents/bijou64/",
        "title": "Bijou64: A variable-length integer encoding",
        "points": 195,
        "comments": 70
      },
      {
        "url": "https://www.invenglobal.com/articles/22330/stop-killing-games-movement-gains-momentum-california-assembly-passes-game-protection-bill",
        "title": "The California state assembly has passed the 'Protect Our Games Act'",
        "points": 142,
        "comments": 136
      },
      {
        "url": "https://www.jeffgeerling.com/blog/2026/its-hard-to-justify-framework-12/",
        "title": "It's hard to justify buying a Framework 12",
        "points": 177,
        "comments": 327
      },
      {
        "url": "https://www.liquid.ai/blog/lfm2-5-8b-a1b",
        "title": "Liquid AI reveals 8B-A1B MoE trained on 38T",
        "points": 122,
        "comments": 37
      }
    ]
  },
  "success": true
}