JX
text/plain
Magic Bytes
Offset: 0
54 68 69 73 20 69 73 20 54 65 58 2C
JX is a text-based file format derived from the TeX typesetting system, originally developed by Donald Knuth for high-quality digital typography. It serves primarily as a document script or processing log, containing instructions for rendering complex mathematical formulae and structured text. While considered a legacy file type compared to modern LaTeX standards, the format consists of plain text and poses no security risks, though it requires a TeX-compliant engine for proper compilation.
Validation Code
How to validate .jx files in Python
Python
def is_jx(file_path: str) -> bool:
"""Check if file is a valid JX by magic bytes."""
signature = bytes([0x54, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x54, 0x65, 0x58, 0x2C])
with open(file_path, "rb") as f:
return f.read(12) == signatureHow to validate .jx files in Node.js
Node.js
function isJX(buffer: Buffer): boolean {
const signature = Buffer.from([0x54, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x54, 0x65, 0x58, 0x2C]);
return buffer.subarray(0, 12).equals(signature);
}
Go
func IsJX(data []byte) bool {
signature := []byte{0x54, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x54, 0x65, 0x58, 0x2C}
if len(data) < 12 {
return false
}
return bytes.Equal(data[:12], signature)
}API Endpoint
GET
/api/v1/jx
curl https://filesignature.org/api/v1/jx