SlimerJS Description
SlimerJS is a free, open-source browser that can be programmed for web development, enabling users to interact with web pages via external JavaScript scripts. This tool facilitates a variety of functions, including opening web pages, clicking on links, and altering content, which makes it advantageous for tasks like functional testing, automating page interactions, monitoring network activity, capturing screens, and scraping web data. In contrast to PhantomJS, SlimerJS utilizes Gecko, the rendering engine used by Mozilla Firefox, rather than WebKit, and it can function in both headless and non-headless modes. The APIs provided by SlimerJS bear similarities to those of PhantomJS, although there are notable differences in their functionalities. Despite these distinctions, most scripts designed for PhantomJS are currently compatible with SlimerJS, providing a seamless transition for developers looking to switch between the two. This versatility ultimately enhances the scripting experience for web developers.
SlimerJS Alternatives
Gaffa is a REST API built for web scraping and browser automation, allowing developers to run real, full browsers at scale with a single API call. It removes the difficulty of managing headless browser frameworks, rotating proxies, CAPTCHA solving, and scaling infrastructure, all of which are handled automatically.
JavaScript-heavy and dynamic websites render exactly as they would for a human visitor by default. Beyond standard scraping, Gaffa supports AI-driven structured data extraction (extract data into a defined schema without writing CSS selectors), screenshot and PDF capture, infinite-scroll and form-filling automation, and clean Markdown conversion for feeding webpages directly into LLM and RAG pipelines.
A rotating residential proxy network keeps access reliable across regions, and a credit-based pricing model means teams pay only for the browser time and bandwidth they actually use. Gaffa is designed for AI engineers, data teams, and developers who want production-grade web data extraction without having to build and maintain their own infrastructure.
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Apify provides the infrastructure developers need to build, deploy, and monetize web automation tools. The platform centers on Apify Store, a marketplace featuring 10,000+ community-built Actors. These are serverless programs that scrape websites, automate browser tasks, and power AI agents.
Developers create Actors using JavaScript, Python, or Crawlee (Apify's open-source crawling library), then publish them to the Store. When other users run your Actor, you earn money. Apify manages the infrastructure, handles payments, and processes monthly payouts to thousands of active developers.
Apify Store offers ready-to-use solutions for common use cases: extracting data from Amazon, Google Maps, and social platforms; monitoring prices; generating leads; and much more.
Under the hood, Actors automatically manage proxy rotation, CAPTCHA solving, JavaScript-heavy pages, and headless browser orchestration. The platform scales on demand with 99.95% uptime and maintains SOC2, GDPR, and CCPA compliance.
For workflow automation, Apify connects to Zapier, Make, n8n, and LangChain. The platform also offers an MCP server, enabling AI assistants like Claude to discover and invoke Actors programmatically.
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DocRaptor
Numerous widely-used free libraries for converting HTML to PDF exist, such as wkhtmltopdf, PhantomJS, and Chrome Headless / Puppeteer. These applications utilize the Webkit or Chromium rendering engines, which are optimized for rendering continuously scrolling web pages. Conversely, DocRaptor is specifically designed for the creation of multi-page documents, which results in significant differences in PDF features, including page breaks, headers and footers, as well as variable page sizes. This core distinction affects how documents are structured and presented. Our conversion engine offers a range of layout and styling capabilities, including support for CSS Paged Media, that surpass what open-source PDF engines can deliver. Moreover, as a cloud-based API, we ensure professional support, immediate scalability, and dependable reliability, all while alleviating users from the expenses associated with maintaining these libraries and their underlying infrastructure over time. This combination of features makes our solution a compelling choice for those needing robust PDF generation.
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blanket.js
Blanket.js is a user-friendly JavaScript code coverage library designed to simplify the installation, usage, and understanding of code coverage metrics. This tool allows for seamless operation or tailored customization to suit specific requirements. By providing code coverage statistics, Blanket.js enhances your current JavaScript tests by indicating which lines of your source code are being tested. It achieves this by parsing the code with Esprima and node-falafel, then adding tracking lines for analysis. The library integrates with test runners to produce coverage reports after test execution. Additionally, a Grunt plugin enables Blanket to function as a traditional code coverage tool, producing instrumented versions of files rather than applying live instrumentation. Blanket.js can also execute QUnit-based reports in a headless manner using PhantomJS, with results shown in the console. Notably, if any predefined coverage thresholds are not satisfied, the Grunt task will fail, ensuring that developers adhere to their quality standards. Overall, Blanket.js serves as an effective solution for developers seeking to maintain high test coverage in their JavaScript applications.
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Pricing
Pricing Starts At:
Free
Free Version:
Yes
Company Details
Company:
SlimerJS
Headquarters:
United States
Website:
slimerjs.org
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Product Details
Platforms
Windows
Mac
Linux
Types of Training
Training Docs
Customer Support
Online Support
SlimerJS Features and Options
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