Web Framework Uploads¶

Save uploaded files from FastAPI, Express, and Spring Boot directly to MediaStore.

Overview¶

When building web APIs that accept file uploads, use save_upload() to store files in MediaStore. This gives you a URI that can be passed to mesh tools and LLM agents.

FastAPI (Python)¶

from fastapi import UploadFile
import mesh

@app.post("/upload")
async def upload(file: UploadFile):
    uri = await mesh.save_upload(file)
    return {"uri": uri}

With Full Metadata¶

result = await mesh.save_upload_result(file)
# result.uri = "file:///tmp/mcp-mesh-media/media/photo.jpg"
# result.name = "photo.jpg"
# result.mime_type = "image/jpeg"
# result.size = 12345

Parameters¶

Express (TypeScript)¶

Using multer for file uploads:

import { saveUpload, saveUploadResult } from "@mcpmesh/sdk";
import multer from "multer";

const upload = multer({ storage: multer.memoryStorage() });

app.post("/upload", upload.single("file"), async (req, res) => {
  const uri = await saveUpload(req.file);
  res.json({ uri });
});

With Full Metadata¶

const result = await saveUploadResult(req.file);
// result.uri, result.name, result.mimeType, result.size

Spring Boot (Java)¶

import org.springframework.web.multipart.MultipartFile;
import io.mcpmesh.spring.media.MeshMedia;
import io.mcpmesh.spring.media.MediaStore;

@PostMapping("/upload")
public Map<String, String> upload(
    @RequestParam("file") MultipartFile file,
    MediaStore mediaStore
) {
    String uri = MeshMedia.saveUpload(file, mediaStore);
    return Map.of("uri", uri);
}

With Full Metadata¶

MediaUploadResult result = MeshMedia.saveUploadResult(file, mediaStore);
// result.uri(), result.name(), result.mimeType(), result.size()

End-to-End Example¶

Upload an image via HTTP, then analyze it with an LLM:

@app.post("/analyze")
async def analyze_upload(file: UploadFile, question: str):
    uri = await mesh.save_upload(file)
    result = await call_tool("image_analyzer", {
        "question": question,
        "image": uri,
    })
    return {"analysis": result}

app.post("/analyze", upload.single("file"), async (req, res) => {
  const uri = await saveUpload(req.file);
  const result = await callTool("image_analyzer", {
    question: req.body.question,
    image: uri,
  });
  res.json({ analysis: result });
});

See Also¶

• MediaStore Configuration -- Storage backends
• Returning Media -- MediaResult for tool responses