File.io API
Overview
File.io is an ephemeral file sharing API that returns a one-time download link after upload — once the file is downloaded, it is automatically deleted from the server. No account or API key is required for basic use, and file expiry can be controlled via a query parameter. This makes it ideal for securely passing temporary files between processes or services.
Beginner Tip
Upload any file with a single curl command and receive back a JSON response with a shareable link. By default the link expires after one download, but you can set a duration like ?expires=1d or ?expires=1w for multi-download scenarios.
Available Data
Example Response
{
"file_id": "f_abc123",
"filename": "document.pdf",
"size_bytes": 1048576,
"mime_type": "application/pdf",
"download_url": "https://example.com/files/f_abc123",
"created_at": "2025-01-15T10:00:00Z"
} Field Reference
success true if the file was uploaded and the link was generated successfully link One-time download URL for the uploaded file, valid until downloaded or expired key Short unique identifier for the file used to construct the download URL expiry ISO 8601 datetime when the file and its link will be permanently deleted size Size of the uploaded file in bytes Implementation Example
const url = "https://www.file.io/";
const response = await fetch(url);
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data); What Can You Build?
Note: These code examples are AI-generated and unverified. Always refer to the official API documentation for accurate usage.
Common Errors & Troubleshooting
Matrix Score Breakdown
Fully tested on Apr 5, 2026
Technical Specifications
Related Tags
Similar APIs
View All →AnonFiles
AnonFiles provides programmatic access to upload and share your files anonymously via REST API.
BayFiles
BayFiles provides programmatic access to upload and share your files via REST API.
Pantry
⭐ Beginner's PickPantry is a free, no-signup JSON storage API designed for small projects and prototypes that need simple key-value persistence without a database.
The Null Pointer
The Null Pointer provides programmatic access to no-bullshit file hosting and url shortening service via REST API.
Box
Box is an enterprise cloud content management platform with a comprehensive API for uploading, downloading, organizing, and sharing files programmatically.