Filestack API
Overview
Filestack is a file handling API that lets you upload, transform, and deliver files from any source — local disk, URL, cloud storage, or social network. It handles multipart uploads, CDN delivery, and on-the-fly image transformations server-side, so you do not need to build your own upload infrastructure. It is widely used in SaaS products where users need to attach documents, images, or videos.
Beginner Tip
You need a free Filestack API key to upload files. Start by uploading a single file via the REST endpoint using a multipart POST, then inspect the returned handle to construct a delivery URL.
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
url Full CDN URL where the uploaded file can be accessed publicly handle Unique identifier for the file used to construct transform and delivery URLs filename Original name of the file that was uploaded size File size in bytes type MIME type of the uploaded file, e.g. image/jpeg or application/pdf mimetype Duplicate MIME type field returned for compatibility with older SDK versions Implementation Example
const url = "https://www.filestack.com/";
// Replace headers or query params with the values required by this API.
const response = await fetch(url, {
headers: {
"X-API-Key": "YOUR_API_KEY"
}
});
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
Partially tested on Apr 5, 2026
Technical Specifications
Related Tags
Similar APIs
View All →ddownload
ddownload is a file hosting and sharing service that exposes an API for uploading files, checking account stats, and managing stored files programmatically.
GoFile
⭐ Beginner's PickGoFile is a free file hosting API that lets you upload files of any size without an account and receive a generated download link in return.
Gyazo
Gyazo is a screenshot hosting API that accepts an image upload and returns a permanent shareable URL with associated metadata like capture time and application info.
Imgbb
⭐ Beginner's PickImgbb is a free image hosting API that accepts an image via URL, base64 string, or multipart upload and returns a permanent hosted link along with thumbnail variants.
Pastebin
⭐ Beginner's PickPastebin's API lets you create, read, and delete pastes — snippets of text or code stored at a shareable URL — programmatically.