FetchSERP MCP Server

Instructions

Implementation Reference

• index.js:284-301 (schema)

  Input schema definition for the 'scrape_webpage_js' tool, specifying required parameters 'url' and 'js_script'.

  {
    name: 'scrape_webpage_js',
    description: 'Scrape a web page with custom JS',
    inputSchema: {
      type: 'object',
      properties: {
        url: {
          type: 'string',
          description: 'The url to scrape',
        },
        js_script: {
          type: 'string',
          description: 'The javascript code to execute on the page',
        },
      },
      required: ['url', 'js_script'],
    },
  },

• index.js:284-301 (registration)

  Registration of the 'scrape_webpage_js' tool in the listTools response.

  {
    name: 'scrape_webpage_js',
    description: 'Scrape a web page with custom JS',
    inputSchema: {
      type: 'object',
      properties: {
        url: {
          type: 'string',
          description: 'The url to scrape',
        },
        js_script: {
          type: 'string',
          description: 'The javascript code to execute on the page',
        },
      },
      required: ['url', 'js_script'],
    },
  },

• index.js:650-652 (handler)

  Handler logic for 'scrape_webpage_js': destructures arguments, calls makeRequest to FetchSERP API endpoint '/api/v1/scrape_js' with POST method, passing URL and JS script in body.

  case 'scrape_webpage_js':
    const { url, js_script, ...jsParams } = args;
    return await this.makeRequest('/api/v1/scrape_js', 'POST', { url, ...jsParams }, { url, js_script }, token);

• index.js:565-613 (helper)

  Helper method 'makeRequest' that performs authenticated HTTP requests to the FetchSERP API, used by all tools including scrape_webpage_js.

  async makeRequest(endpoint, method = 'GET', params = {}, body = null, token = null) {
    const fetchserpToken = token || process.env.FETCHSERP_API_TOKEN;
    
    if (!fetchserpToken) {
      throw new McpError(
        ErrorCode.InvalidRequest,
        'FETCHSERP_API_TOKEN is required'
      );
    }
  
    const url = new URL(`${API_BASE_URL}${endpoint}`);
    
    // Add query parameters for GET requests
    if (method === 'GET' && Object.keys(params).length > 0) {
      Object.entries(params).forEach(([key, value]) => {
        if (value !== undefined && value !== null) {
          if (Array.isArray(value)) {
            value.forEach(v => url.searchParams.append(`${key}[]`, v));
          } else {
            url.searchParams.append(key, value.toString());
          }
        }
      });
    }
  
    const fetchOptions = {
      method,
      headers: {
        'Authorization': `Bearer ${fetchserpToken}`,
        'Content-Type': 'application/json',
      },
    };
  
    if (body && method !== 'GET') {
      fetchOptions.body = JSON.stringify(body);
    }
  
    const response = await fetch(url.toString(), fetchOptions);
    
    if (!response.ok) {
      const errorText = await response.text();
      throw new McpError(
        ErrorCode.InternalError,
        `API request failed: ${response.status} ${response.statusText} - ${errorText}`
      );
    }
  
    return await response.json();
  }