topojson_to_geojson
Convert TopoJSON to GeoJSON format for geographic data processing and visualization.
Instructions
Convert TopoJSON to GeoJSON format
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| topojson | Yes | TopoJSON object to convert | |
| objectName | No | Name of the TopoJSON object to convert (if not provided, first object is used) |
Implementation Reference
- src/index.ts:541-577 (handler)The main execution logic for the 'topojson_to_geojson' tool. It validates input, determines the TopoJSON object to convert, and uses topojsonClient.feature to produce GeoJSON output.
async topojsonToGeoJSON(args: any): Promise<ToolResponse> { const { topojson, objectName } = args; if (!topojson) { throw new McpError( ErrorCode.InvalidParams, 'Missing required parameter: topojson' ); } try { console.error('[Converting] TopoJSON to GeoJSON'); // Determine which object to convert let objName = objectName; // If no object name provided, use the first object in the topology if (!objName && topojson.objects) { objName = Object.keys(topojson.objects)[0]; } if (!objName || !topojson.objects || !topojson.objects[objName]) { throw new Error('No valid object found in TopoJSON'); } // Convert TopoJSON to GeoJSON const geojson = topojsonClient.feature(topojson, topojson.objects[objName]); return this.formatToolResponse(JSON.stringify(geojson, null, 2)); } catch (error) { console.error('[Error] TopoJSON to GeoJSON conversion failed:', error); throw new McpError( ErrorCode.InternalError, `TopoJSON to GeoJSON conversion failed: ${error instanceof Error ? error.message : String(error)}` ); } } - src/index.ts:189-206 (registration)Registration of the 'topojson_to_geojson' tool in the ListTools response, including name, description, and input schema definition.
{ name: 'topojson_to_geojson', description: 'Convert TopoJSON to GeoJSON format', inputSchema: { type: 'object', properties: { topojson: { type: 'object', description: 'TopoJSON object to convert', }, objectName: { type: 'string', description: 'Name of the TopoJSON object to convert (if not provided, first object is used)', }, }, required: ['topojson'], }, }, - src/index.ts:192-204 (schema)Input schema definition for the 'topojson_to_geojson' tool specifying required 'topojson' object and optional 'objectName'.
inputSchema: { type: 'object', properties: { topojson: { type: 'object', description: 'TopoJSON object to convert', }, objectName: { type: 'string', description: 'Name of the TopoJSON object to convert (if not provided, first object is used)', }, }, required: ['topojson'], - src/index.ts:290-291 (registration)Dispatch case in the CallToolRequest handler that routes to the topojsonToGeoJSON method.
case 'topojson_to_geojson': return await this.topojsonToGeoJSON(request.params.arguments);