Data
YAML Ain’t Markup Language is a data format commonly identified by .yaml, .yml. Use the listed signatures, MIME types, and structure notes to validate files beyond the extension.
74 69 74 6C 65 3A title:SIGNATURE = bytes.fromhex("7469746c653a")
OFFSET = 0
def is_yaml(path: str) -> bool:
with open(path, "rb") as f:
f.seek(OFFSET)
head = f.read(len(SIGNATURE))
return head == SIGNATUREconst SIGNATURE = [0x74, 0x69, 0x74, 0x6c, 0x65, 0x3a];
const OFFSET = 0;
// bytes: a Uint8Array / Buffer holding the start of the file
export function isYaml(bytes) {
return SIGNATURE.every((byte, i) => bytes[OFFSET + i] === byte);
}package fileid
import "bytes"
var isyamlSignature = []byte{0x74, 0x69, 0x74, 0x6c, 0x65, 0x3a}
const isyamlOffset = 0
func IsYaml(b []byte) bool {
end := isyamlOffset + len(isyamlSignature)
if len(b) < end {
return false
}
return bytes.Equal(b[isyamlOffset:end], isyamlSignature)
}const SIGNATURE: &[u8] = &[0x74, 0x69, 0x74, 0x6c, 0x65, 0x3a];
const OFFSET: usize = 0;
fn is_yaml(bytes: &[u8]) -> bool {
bytes.get(OFFSET..OFFSET + SIGNATURE.len()) == Some(SIGNATURE)
}<?php
$signature = "\x74\x69\x74\x6c\x65\x3a";
$offset = 0;
function is_yaml(string $bytes): bool {
global $signature, $offset;
return substr($bytes, $offset, strlen($signature)) === $signature;
}YAML Ain’t Markup Language is used for data exchange, imports, exports, parser testing, and validation workflows. Encoding, delimiters, versions, and container structure often change implementation behavior.
Untrusted input is not safe just because the format was detected. Account for parser exceptions, large files, unexpected encodings, and external references.
11 samples help test leading-byte detection, parser errors, upload limits, and download behavior.
Blue Sky YAML is a YAML Ain’t Markup Language sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
01-blue-sky.yaml0f6ffd57cd39429ef5ffa4f6991d0538f24f1add9569999562ce04b942d2d376Flower Garden YAML is a YAML Ain’t Markup Language sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
02-flower-garden.yamldd741065e0186333a677b530975c934fd052fe7d672bb53746c5e86a52d8bea3Navy Blue Sky YAML is a YAML Ain’t Markup Language sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
03-navy-blue-sky.yaml98431cf0f854d07f47f9d99219d28e4dce87b753b35b78a9aaf750c972b782c5Nature of the Sky YAML is a YAML Ain’t Markup Language sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
04-nature-sky.yaml6cfd66f8a3f6391bce8291452f851ccff9b359b9436e7ceeb82855f96f488b7fSky Landscape YAML is a YAML Ain’t Markup Language sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
05-sky-landscape.yaml59ffd56784b0c6233a867ba538b25dd741737a7372176accca405e50e9c6ca81Starry Sky YAML is a YAML Ain’t Markup Language sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
06-starry-sky.yamlc4c03b904441a9b77d20f23eb15af66255c0bb17cc2bf1bdb327a7b088a73381Blue Night Sky YAML is a YAML Ain’t Markup Language sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
07-blue-night-sky.yamle4cc3804885f18f7b696fa22d7232170e584f10a1ca199aefbaafed4df688b00Hibiscus Flower YAML is a YAML Ain’t Markup Language sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
08-hibiscus-flower.yaml722fb2f424628791e265901aff3fd1ca55e27e721d0c138d5e5752b457735d21Arctic Sky YAML is a YAML Ain’t Markup Language sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
09-arctic-sky.yamlfd0d557c83c5914bfe69a6c76d9f7f1a52e7ebc03b5a19e2afc53cb8f3f51810Sunset Rays YAML is a YAML Ain’t Markup Language sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
10-sunset-rays.yaml4efad6d8a06c0965b158bb5e9fac03d45ec2fe4eeb9c1c2b5c62767ced5a26dcNASA Blue Marble YAML is a YAML Ain’t Markup Language sample based on NASA Image and Video Library. It can be used to test downloads, parsers, previews, and file type detection.
nasa-blue-marble-2012-east.yaml8e37e194ab4ff8cee72db6ad2c6fe0e35ad70fd5e3bf7c97067eca2e0b8b07e3YAML Ain’t Markup Language files begin with the byte signature 74 69 74 6C 65 3A ("title:"). Detect the format by reading these leading bytes rather than trusting the file extension alone.
The MIME type for YAML Ain’t Markup Language is application/yaml, text/yaml.
YAML Ain’t Markup Language files use the .yaml, .yml extension. The extension is a convention only and does not guarantee the file contents, so combine it with signature and structure checks.