JDF (.jdf)
.jdf file signature | application/x-jeol-jdf
Magic Bytes
Offset 0
4A 45 4F 4C 2E 4E 4D 52
Sources: Apache Tika
Extension
.jdf
MIME Type
application/x-jeol-jdf
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .jdf files in Python
def is_jdf(file_path: str) -> bool:
"""Check if file is a valid JDF by magic bytes."""
signature = bytes([0x4A, 0x45, 0x4F, 0x4C, 0x2E, 0x4E, 0x4D, 0x52])
with open(file_path, "rb") as f:
return f.read(8) == signatureHow to validate .jdf files in Node.js
function isJDF(buffer: Buffer): boolean {
const signature = Buffer.from([0x4A, 0x45, 0x4F, 0x4C, 0x2E, 0x4E, 0x4D, 0x52]);
return buffer.subarray(0, 8).equals(signature);
}How to validate .jdf files in Go
func IsJDF(data []byte) bool {
signature := []byte{0x4A, 0x45, 0x4F, 0x4C, 0x2E, 0x4E, 0x4D, 0x52}
if len(data) < 8 {
return false
}
return bytes.Equal(data[:8], signature)
}API Endpoint
/api/v1/jdf
curl https://filesignature.org/api/v1/jdf
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .jdf file?
A .jdf file is a JDF file.
What are the magic bytes for .jdf files?
The magic bytes for JDF files are 4A 45 4F 4C 2E 4E 4D 52 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .jdf file?
To validate a .jdf file, read the first bytes of the file and compare them against the known magic bytes (4A 45 4F 4C 2E 4E 4D 52) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .jdf files?
The primary MIME type for .jdf files is application/x-jeol-jdf.
Is it safe to open .jdf files?
JDF (.jdf) files are generally safe to open. They are classified as low risk because they primarily contain data rather than executable code. However, always ensure files come from a trusted source.