JNG
video/x-jng
Magic Bytes
Offset: 0
8B 4A 4E 47
JPEG Network Graphics (JNG) is a graphics file format created as a sub-format of the Multiple-image Network Graphics (MNG) specification, managed by the PNG development group. It was designed to combine the high-ratio lossy compression capabilities of JPEG with the alpha transparency and structural features of the PNG architecture. Although originally intended as a complement to MNG for web graphics, JNG is considered a legacy format and receives minimal support in modern web browsers and image viewers.
Validation Code
How to validate .jng files in Python
Python
def is_jng(file_path: str) -> bool:
"""Check if file is a valid JNG by magic bytes."""
signature = bytes([0x8B, 0x4A, 0x4E, 0x47])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .jng files in Node.js
Node.js
function isJNG(buffer: Buffer): boolean {
const signature = Buffer.from([0x8B, 0x4A, 0x4E, 0x47]);
return buffer.subarray(0, 4).equals(signature);
}
Go
func IsJNG(data []byte) bool {
signature := []byte{0x8B, 0x4A, 0x4E, 0x47}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
GET
/api/v1/jng
curl https://filesignature.org/api/v1/jng