Validate llms.txt File in PHP
The llms.txt specification tells AI systems which pages to prioritize and how to cite your content. This endpoint validates your llms.txt file against the spec, checks for common mistakes, and suggests improvements.
Endpoint
POST /api/v1/llmstxt/validate
PHP Code
$ch = curl_init("https://seodiff.io/api/v1/llmstxt/validate");
curl_setopt_array($ch, [
CURLOPT_RETURNTRANSFER => true,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_HTTPHEADER => [
"Authorization: Bearer " . getenv("SEODIFF_API_KEY"),
"Content-Type: application/json",
],
CURLOPT_POSTFIELDS => '{"url":"https://example.com/llms.txt"}',
]);
$response = json_decode(curl_exec($ch), true);
curl_close($ch);
echo "Status: " . ($response["status"] ?? "unknown") . "\n";Example Response
{"valid":true,"warnings":["Consider adding a 'preferred-citation' field"],"sections_found":3,"urls_listed":12}Authentication
All requests require an API key in the Authorization: Bearer header. Get your API key →
Same Endpoint, Other Languages
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