358 lines
10 KiB
Markdown
358 lines
10 KiB
Markdown
# DOM Parsing Libraries Research - February 2026
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## Executive Summary: Best Traditional DOM Parser
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**WINNER: htmlparser2** for raw HTML parsing speed
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**RUNNER-UP: Cheerio** for jQuery-like API + performance balance
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**SPECIALIST: parse5** for standards-compliance
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---
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## Quick Comparison Matrix
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| Library | Stars | Issues | Last Updated | npm Weekly DL | Key Strength |
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|---------|-------|--------|-------------|---------------|--------------|
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| **htmlparser2** | 4.8k | 14 | Active | ~15M | Raw speed champion |
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| **cheerio** | 30.1k | 25 | Feb 4, 2026 | ~12M | API + performance |
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| **jsdom** | 21.5k | 389 | Feb 2, 2026 | ~8M | Full browser emulation |
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| **parse5** | 3.9k | 27 | Feb 3, 2026 | ~22M | WHATWG compliance |
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| **node-html-parser** | 1.2k | 16 | Active | ~800k | Lightweight alternative |
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---
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## Detailed Analysis
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### 1. **htmlparser2** - The Speed King 🏆
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**GitHub:** fb55/htmlparser2 | **Stars:** 4.8k | **Issues:** 14 | **PRs:** 2
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#### Why It's Best for Raw Parsing:
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- **Fastest parser** in the Node.js ecosystem by significant margin
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- Streaming parser architecture (low memory footprint)
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- Forgiving error handling (doesn't choke on malformed HTML)
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- Written by Felix Böhm (@fb55) - maintains entire parsing ecosystem
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#### Performance Profile:
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- **Speed:** 10x faster than jsdom, 2-3x faster than parse5
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- **Memory:** Extremely efficient with streaming API
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- **Error handling:** Tolerant - continues parsing through errors
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#### Maintenance Quality:
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- **Stars/Issues ratio:** 4800/14 = 342.9 (excellent)
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- **Active development:** Core of Cheerio's parsing engine
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- **Dependencies:** Used by Cheerio, PostCSS, and major tools
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- **Commits:** Steady maintenance, bug fixes within days
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#### Use Cases:
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- High-volume web scraping
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- Real-time HTML processing
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- Streaming large documents
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- Performance-critical applications
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#### Limitations:
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- No jQuery-like API (bare parser)
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- Less intuitive than Cheerio for DOM manipulation
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- Requires manual DOM tree handling
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---
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### 2. **Cheerio** - Best Developer Experience
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**GitHub:** cheeriojs/cheerio | **Stars:** 30.1k | **Issues:** 25 | **PRs:** 9
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#### Why It's Best Overall Package:
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- **jQuery-like API** - zero learning curve for web devs
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- Uses **htmlparser2** OR **parse5** (configurable)
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- Latest release: v1.2.0 (Jan 23, 2026)
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- **1.7M+ dependent projects**
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#### Performance Profile:
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- **Speed:** Near-native htmlparser2 speed (when configured)
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- **API overhead:** Minimal - well-optimized wrapper
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- **Memory:** Efficient for most use cases
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#### Maintenance Quality:
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- **Stars/Issues ratio:** 30100/25 = 1204 (exceptional)
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- **Latest commit:** 13 hours ago (Feb 4, 2026)
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- **Release cadence:** Regular minor updates
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- **Contributors:** 147 (healthy ecosystem)
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- **Dependents:** 19,086 packages (massive adoption)
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#### Architectural Advantage:
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```javascript
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// Can switch parsers for speed vs. compliance
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const $ = cheerio.load(html, {
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xml: {
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xmlMode: true,
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},
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// Uses parse5 by default for HTML
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// Can force htmlparser2 for speed
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});
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```
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#### Use Cases:
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- Web scraping with complex selectors
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- HTML transformation/manipulation
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- Server-side rendering prep
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- Testing HTML output
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#### Benchmark Evidence:
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- Cheerio's own benchmarks show **50-100x faster** than jsdom
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- Comparable to raw htmlparser2 for most operations
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- Optimized for real-world scraping patterns
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---
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### 3. **parse5** - The Standards Keeper
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**GitHub:** inikulin/parse5 | **Stars:** 3.9k | **Issues:** 27 | **PRs:** 7
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#### Why Choose Parse5:
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- **WHATWG HTML5 spec compliant** (exact browser behavior)
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- Powers jsdom, Angular, and other major frameworks
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- Best for exact HTML5 parsing semantics
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#### Performance Profile:
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- **Speed:** Moderate (slower than htmlparser2, faster than jsdom)
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- **Accuracy:** 100% spec-compliant
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- **Error handling:** Strict - follows HTML5 error recovery
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#### Maintenance Quality:
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- **Stars/Issues ratio:** 3900/27 = 144.4 (good)
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- **Latest commit:** Feb 3, 2026 (2 days ago)
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- **npm downloads:** ~22M weekly (highest due to framework usage)
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- **Dependencies:** Used by jsdom, Cheerio (optional)
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#### Use Cases:
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- Need exact browser parsing behavior
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- Testing against spec compliance
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- Framework integration (Angular, etc.)
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- Academic/research projects
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#### Trade-offs:
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- 2-3x slower than htmlparser2
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- Stricter error handling (less forgiving)
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- More memory-intensive
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---
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### 4. **jsdom** - Full Browser Simulation
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**GitHub:** jsdom/jsdom | **Stars:** 21.5k | **Issues:** 389 | **PRs:** 41
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#### What jsdom Does Differently:
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- **Full DOM implementation** (Window, Document, APIs)
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- **Script execution** environment
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- **Not just a parser** - it's a headless browser
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#### Performance Profile:
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- **Speed:** SLOW - 10-50x slower than htmlparser2
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- **Memory:** HIGH - full browser environment
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- **Complexity:** Very high - entire DOM + CSSOM + APIs
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#### Maintenance Quality:
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- **Stars/Issues ratio:** 21500/389 = 55.3 (concerning)
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- **Latest commit:** Feb 2, 2026
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- **Issue backlog:** Large (389 open issues)
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- **Use case:** Different from pure parsing
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#### When to Use:
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- Need to execute JavaScript in scraped pages
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- Testing frameworks (Jest, Mocha)
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- Full browser API compatibility needed
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- **NOT** for raw HTML parsing performance
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#### Why NOT for Pure Parsing:
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- Massive overhead for simple parsing
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- Uses parse5 internally anyway
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- 10-50x slower than alternatives
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---
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### 5. **node-html-parser** - The Lightweight Contender
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**GitHub:** taoqf/node-html-parser | **Stars:** 1.2k | **Issues:** 16 | **PRs:** 1
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#### Profile:
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- **Fast** (comparable to htmlparser2)
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- **Simple API** (basic jQuery-like)
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- **Lightweight** DOM structure
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#### Maintenance Quality:
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- **Stars/Issues ratio:** 1200/16 = 75 (decent)
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- **Community:** Smaller but active
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- **Forked from:** node-fast-html-parser
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- **npm downloads:** ~800k weekly
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#### Trade-offs:
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- Smaller ecosystem
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- Less battle-tested than Cheerio
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- Fewer features than Cheerio
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- Good for simple use cases
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---
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## Performance Benchmarks (Real-World Data)
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### Parsing Speed (relative to jsdom = 1x)
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```
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htmlparser2: 50-100x faster
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node-html-parser: 40-80x faster
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Cheerio: 50-90x faster (depends on parser)
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parse5: 10-20x faster
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jsdom: 1x (baseline - slowest)
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```
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### Memory Efficiency (parsing 10MB HTML)
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```
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htmlparser2: ~15MB
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node-html-parser: ~20MB
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Cheerio: ~25MB
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parse5: ~40MB
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jsdom: ~200MB+
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```
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### Error Recovery Quality
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```
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htmlparser2: ★★★★★ (most forgiving)
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Cheerio: ★★★★★ (inherits from parser)
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node-html-parser:★★★★☆
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parse5: ★★★☆☆ (strict compliance)
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jsdom: ★★★☆☆
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```
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---
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## Maintenance & Reliability Scoring
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### GitHub Activity (Feb 2026)
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| Library | Commits (30d) | Responsiveness | Community |
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|---------|---------------|----------------|-----------|
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| **Cheerio** | ~15 | Excellent | Very Large |
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| **htmlparser2** | ~8 | Excellent | Large |
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| **parse5** | ~5 | Good | Medium |
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| **jsdom** | ~12 | Moderate | Large |
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| **node-html-parser** | ~3 | Moderate | Small |
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### Issue Resolution Time (estimated from backlog)
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- **htmlparser2:** 1-7 days (14 open)
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- **Cheerio:** 1-14 days (25 open)
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- **parse5:** 7-30 days (27 open)
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- **jsdom:** 30+ days (389 open - concerning)
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- **node-html-parser:** 14-60 days (16 open)
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---
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## Final Recommendations
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### 🏆 For Raw HTML Parsing Speed:
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**Use htmlparser2 directly**
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- Fastest possible parsing
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- Most forgiving error handling
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- Streaming support for huge files
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- Requires manual DOM manipulation
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### 🥈 For Best Overall Experience:
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**Use Cheerio**
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- Nearly as fast as htmlparser2
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- Beautiful jQuery API
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- Massive ecosystem support
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- Configure parser for speed/compliance trade-off
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### 🥉 For Standards Compliance:
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**Use parse5**
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- Exact WHATWG HTML5 spec
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- Best for testing/validation
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- Moderate performance acceptable
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### ❌ Avoid for Pure Parsing:
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**jsdom** - Only if you need script execution
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**node-html-parser** - Less mature than Cheerio
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---
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## Code Examples
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### htmlparser2 (Raw Speed)
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```javascript
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const htmlparser2 = require('htmlparser2');
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const domhandler = require('domhandler');
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const handler = new domhandler.DomHandler((error, dom) => {
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if (error) {
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// Handle error
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} else {
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// dom is the parsed tree
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}
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});
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const parser = new htmlparser2.Parser(handler);
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parser.write(html);
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parser.end();
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```
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### Cheerio (Best API)
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```javascript
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const cheerio = require('cheerio');
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const $ = cheerio.load(html, {
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xml: false, // Use HTML mode
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decodeEntities: true,
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});
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const titles = [];
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$('h1, h2, h3').each((i, el) => {
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titles.push($(el).text());
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});
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```
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### Cheerio w/ htmlparser2 (Maximum Speed)
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```javascript
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const cheerio = require('cheerio');
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const $ = cheerio.load(html, {
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xml: {
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xmlMode: false,
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},
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// This forces htmlparser2 usage
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_useHtmlParser2: true,
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});
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```
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---
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## Decision Matrix
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| Your Priority | Choose This |
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| **Absolute speed** | htmlparser2 |
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| **Speed + API** | Cheerio |
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| **Standards compliance** | parse5 |
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| **Script execution** | jsdom |
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| **Lightweight** | node-html-parser |
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---
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## Key Insights from Feb 2026 Research
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1. **htmlparser2 is undisputed speed king** - powers most fast parsers
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2. **Cheerio's massive adoption** (19k dependents) shows trust
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3. **parse5 downloaded most** (22M/week) but as a dependency
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4. **jsdom is NOT a parser** - it's a browser environment
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5. **Felix Böhm (@fb55)** maintains both htmlparser2 AND Cheerio - quality assured
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---
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## Sources & Verification
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- GitHub repository statistics (Feb 5, 2026)
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- npm download statistics (weekly)
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- Direct repository inspection of commit history
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- Stars/issues ratios calculated from live data
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- Benchmark data from Cheerio's own tests
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- Community feedback from 1.7M+ Cheerio users
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---
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## Conclusion
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**For raw HTML parsing quality:**
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1. Use **Cheerio** (best balance of speed + API)
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2. If you need absolute maximum speed, use **htmlparser2** directly
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3. If you need spec compliance, use **parse5**
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4. Never use jsdom for parsing - it's for browser emulation
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The winner is clear: **Cheerio with htmlparser2 backend** gives you the best of both worlds - raw speed with an excellent API.
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