# Fitter (MCP server)

> Fitter is an MCP server that turns any website or API into structured JSON with LLM-authored declarative scraping configs. It has 133 GitHub stars, is released under the MIT license and runs locally with docker run -i --rm -e FITTER_PLUGINS ghcr.io/pxyup/fitter-mcp:v1.8.3.

Fitter turns any website or API into structured JSON — declaratively. One JSON/YAML config describes where the data lives (HTTP request, headless browser, file, static value) and what to extract (JSON paths, CSS selectors, XPath). No code, no brittle scraping scripts.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/PxyUp/fitter |
| GitHub stars | 133 |
| License | MIT |
| Language | Go |
| Transport | stdio |
| Packages | docker: ghcr.io/pxyup/fitter-mcp:v1.8.3; docker: ghcr.io/pxyup/fitter-mcp:v1.8.3-playwright |
| Remote URL | none |
| Needs API key | no |
| Official | no |
| Works with | Claude Desktop, Claude Code, Cursor, VS Code |
| Category | Web & browsing |
| Latest release | v1.8.3 (Aug 26, 2026) |
| Last commit | Aug 26, 2026 |
| MCP registry name | io.github.PxyUp/fitter |

## Install

### Claude Desktop (claude_desktop_config.json)

```json
{
  "mcpServers": {
    "fitter": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "-e",
        "FITTER_PLUGINS",
        "ghcr.io/pxyup/fitter-mcp:v1.8.3"
      ],
      "env": {
        "FITTER_PLUGINS": "your-value"
      }
    }
  }
}
```

Settings > Developer > Edit Config. macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\. Restart Claude Desktop afterwards.

### Claude Code

```sh
claude mcp add --env FITTER_PLUGINS=your-value --transport stdio fitter -- docker run -i --rm -e FITTER_PLUGINS ghcr.io/pxyup/fitter-mcp:v1.8.3
```

### Cursor (.cursor/mcp.json)

```json
{
  "mcpServers": {
    "fitter": {
      "type": "stdio",
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "-e",
        "FITTER_PLUGINS",
        "ghcr.io/pxyup/fitter-mcp:v1.8.3"
      ],
      "env": {
        "FITTER_PLUGINS": "your-value"
      }
    }
  }
}
```

Project file; use ~/.cursor/mcp.json to enable it in every project.

### VS Code (.vscode/mcp.json)

```json
{
  "servers": {
    "fitter": {
      "type": "stdio",
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "-e",
        "FITTER_PLUGINS",
        "ghcr.io/pxyup/fitter-mcp:v1.8.3"
      ],
      "env": {
        "FITTER_PLUGINS": "your-value"
      }
    }
  }
}
```

Config formats checked against the official docs on 2026-10-07.

## Environment variables

- `FITTER_PLUGINS`: Optional path to a fitter plugins folder

## Tools

- `fitter_run`: Run a Fitter config passed inline (JSON or YAML string) and return the extracted data as JSON.
- `fitter_run_file`: Same as fitterrun but reads the config from a local .json/.yaml file
- `fitter_run_url`: Same as fitterrun but downloads the config from an HTTP(S) URL, e.g. a raw GitHub link
- `fitter_inspect_url`: Fetch a URL and return a compact structure outline + candidate selectors/paths (gjson paths for JSON;…
- `fitter_validate_config`: Validate a config without executing it (structure, responsetype, connector data source, model).
- `fitter_config_reference`: Return a condensed reference of the whole config format (connectors, parsers, model/field schema, placeholders,…

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