Generic JPEG Image
image/jpeg
Magic Bytes
Offset: 0
FF D8 FF
The JPEG image format is a standard lossy compression method for digital images, developed and maintained by the Joint Photographic Experts Group. It serves as the most common format for digital photography and web graphics due to its efficient balance between storage size and image quality. Although generally classified as safe for standard viewing, malformed structures within the compression stream have historically been exploited to execute arbitrary code in vulnerable parsers.
Validation Code
How to validate .jpeg files in Python
Python
def is_jpeg(file_path: str) -> bool:
"""Check if file is a valid JPEG by magic bytes."""
signature = bytes([0xFF, 0xD8, 0xFF])
with open(file_path, "rb") as f:
return f.read(3) == signatureHow to validate .jpeg files in Node.js
Node.js
function isJPEG(buffer: Buffer): boolean {
const signature = Buffer.from([0xFF, 0xD8, 0xFF]);
return buffer.subarray(0, 3).equals(signature);
}
Go
func IsJPEG(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/jpeg
curl https://filesignature.org/api/v1/jpeg