File Uploads API

Handle file uploads securely with signed URLs. Files are stored in S3 and accessible via signed URLs for privacy and access control.

Get Signed Upload URL

POST /uploads/sign

Request a signed URL for uploading a file. The signed URL is temporary and expires after a specified time.

Request Body

{
  "fileName": "document.pdf",
  "fileType": "application/pdf",
  "fileSize": 1024000,
  "formId": "form_123"
}

Response

{
  "uploadUrl": "https://s3.amazonaws.com/...",
  "fileId": "file_123",
  "expiresIn": 3600
}

Upload Flow

Request a signed upload URL from Formr
Upload the file directly to S3 using the signed URL
Include the fileId in your form submission
Formr validates and processes the file

File Validation

Files are validated for type, size, and security. Supported file types include images, documents, and other common formats. Configure file type restrictions in your form schema.

Forms API →Submissions API →