FilterLists API
Overview
FilterLists is a community-maintained directory API that catalogs hundreds of filter lists used by ad blockers and firewalls like uBlock Origin and Pi-hole. You can query it to get metadata about filter lists including their names, URLs, languages, and the software they target. It is useful for building ad-block management tools or staying current with the filter list ecosystem.
Beginner Tip
FilterLists has no authentication — just call the REST API endpoints directly. Start with GET /api/v1/lists to retrieve all known filter lists and their metadata in one call.
Available Data
Example Response
{
"status": "success",
"data": {
"result": "Data from FilterLists",
"description": "Lists of filters for adblockers and firewalls",
"timestamp": "2025-01-15T10:00:00Z"
}
} Field Reference
id Unique numeric identifier for the filter list. name Human-readable name of the filter list. description Brief explanation of what the filter list blocks or filters. homeUrl Homepage URL where the filter list is officially maintained. onDiskSizeKb Approximate file size of the filter list in kilobytes. syntaxes List of filter syntaxes supported, such as AdBlock or hosts. Implementation Example
const url = "https://filterlists.com/";
const response = await fetch(url);
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data); What Can You Build?
Note: These code examples are AI-generated and unverified. Always refer to the official API documentation for accurate usage.
Common Errors & Troubleshooting
Matrix Score Breakdown
Fully tested on Apr 5, 2026
Technical Specifications
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