paperclipai/paperclip · error

Unsupported image type: ${contentType || "unknown"}

Error message

Unsupported image type: ${contentType || "unknown"}

What it means

Error "Unsupported image type: ${contentType || "unknown"}" thrown in paperclipai/paperclip.

Source

Thrown at server/src/routes/assets.ts:241

  router.post("/companies/:companyId/logo", async (req, res) => {
    const companyId = req.params.companyId as string;
    assertCompanyAccess(req, companyId);

    try {
      await runSingleFileUpload(companyLogoUpload, req, res);
    } catch (err) {
      if (err instanceof multer.MulterError) {
        if (err.code === "LIMIT_FILE_SIZE") {
          res.status(422).json({
            error: `Image is larger than the ${formatAttachmentSize(MAX_ATTACHMENT_BYTES)} limit`,
          });
          return;
        }
        res.status(400).json({ error: err.message });
        return;
      }
      throw err;
    }

    const file = (req as Request & { file?: { mimetype: string; buffer: Buffer; originalname: string } }).file;
    if (!file) {
      res.status(400).json({ error: "Missing file field 'file'" });
      return;
    }

    const contentType = (file.mimetype || "").toLowerCase();
    if (!ALLOWED_COMPANY_LOGO_CONTENT_TYPES.has(contentType)) {
      res.status(422).json({ error: `Unsupported image type: ${contentType || "unknown"}` });
      return;
    }

    let fileBody = file.buffer;
    if (contentType === SVG_CONTENT_TYPE) {
      const sanitized = sanitizeSvgBuffer(file.buffer);
      if (!sanitized || sanitized.length <= 0) {

View on GitHub (pinned to 01ad858492)

Solutions

1. Upload an image with a supported content type (e.g. PNG, JPEG).

When it happens

Trigger: Thrown at server/src/routes/assets.ts:240 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of paperclipai/paperclip@01ad858492 (2026-08-18). Data as JSON: /api/errors/3e8d894bf3138579. Report an issue: GitHub.