abp2dnr

This is a script to convert Adblock Plus filter lists to chrome.declarativeNetRequest rulesets as far as is possible.

See also Chromium's built-in filter list converter.

Requirements

Before you begin, make sure to install Node.js version 16 or higher.

Then the required packages can be installed via Git and npm:

npm install

The declarativeNetRequest rulesets generated by this script require Chrome >= 101 to function correctly. (See this announcement for context.)

Usage

Command line interface

Create a declarativeNetRequest ruleset output.json from an Adblock Plus filter list input.txt:

node abp2dnr.js < input.txt > output.json

JavaScript API

Behind that, there's a JavaScript API which the command line interface uses. It works something like this:

const {convertFilter, compressRules} = require("./lib/abp2dnr");

let rules = []

// Convert the filters to declarativeNetRequest rules.
for (let filter of filters)
  rules.push(await convertFilter(filter));

// Optionally combine rules where possible.
rules = compressRules(rules)

// Assign the rules an ID (must not be before compressRules()).
let id = 1;
for (let rule of rules)
  rule.id = id++;

It's important to note that convertFilter expects a Filter Object and not a string containing the filter's text. To parse filter text you'll need to do something like this first:

const {Filter} = require("adblockpluscore/lib/filterClasses");
Filter.fromText(Filter.normalize(filterText));

Tests

Unit tests live in the tests/ directory. You can run them by typing this command:

npm test

Linting

You can lint the code by typing this command:

npm run lint