Digital camera JPG usingExchangeable Image File Format
image/jpeg
Magic Bytes
Offset: 0
FF D8 FF
This JPEG format variant, incorporating the Exchangeable Image File Format (Exif) standard, was developed by the Joint Photographic Experts Group and the Japan Electronics and Information Technology Industries Association. It serves as the ubiquitous standard for digital photography, enabling cameras and smartphones to embed metadata such as exposure settings, timestamps, and geolocation coordinates directly within compressed images. Although fundamentally safe for viewing, embedded metadata can inadvertently expose sensitive privacy information, requiring users to scrub data before sharing publicly.
Validation Code
How to validate .jpg files in Python
Python
def is_jpg(file_path: str) -> bool:
"""Check if file is a valid JPG by magic bytes."""
signature = bytes([0xFF, 0xD8, 0xFF])
with open(file_path, "rb") as f:
return f.read(3) == signatureHow to validate .jpg files in Node.js
Node.js
function isJPG(buffer: Buffer): boolean {
const signature = Buffer.from([0xFF, 0xD8, 0xFF]);
return buffer.subarray(0, 3).equals(signature);
}
Go
func IsJPG(data []byte) bool {
signature := []byte{0xFF, 0xD8, 0xFF}
if len(data) < 3 {
return false
}
return bytes.Equal(data[:3], signature)
}API Endpoint
GET
/api/v1/jpg
curl https://filesignature.org/api/v1/jpg