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Format JSON Online vs ValidateHTML

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Format JSON Online compared with ValidateHTML
DetailFormat JSON Online logo Format JSON OnlineValidateHTML logo ValidateHTML
What it doesFree online JSON formatter, validator, minifier and converter with 60+ tools for developers HTML validation API and free online validator for deployed pages
StageStartup Not given
Founded2025 Not given
Based inUS FR
Pricing modelFree Freemium
PricingNot given Free: unlimited validators and checkers, no account required, free site scans. Solo: 49 EUR per month including full site reports and monitoring of 1 site. Agency: 149 EUR per month including monitoring of 10 sites. Automatic fixes: from 3 EUR for 10 pages, 1 free fix daily without account. Full sit
Key features
  • JSON formatter with syntax highlighting and customizable indentation
  • JSON validator with error location and fix suggestions
  • AI-powered error fixing for common JSON issues
  • JSON minifier reducing file size by 30-50%
  • JSON to 15+ format conversions including CSV, XML, YAML, SQL, C#, Python
  • Support for files up to 100MB
  • 100% client-side processing with no server data exposure
  • Accessibility (WCAG) validation with machine-detectable failures
  • HTML specification compliance checking
  • Meta tags and viewport validation
  • Open Graph checker
  • Page weight measurement and compression analysis
  • Single API endpoint with configurable checks
  • Single verdict field for build pipeline integration
  • Automatic AI-powered HTML fixes
  • Weekly site audits with change notifications
  • GitHub Actions integration
What makes it different
  • AI-powered features for automatic error fixing and data generation
  • No signup, registration or installation required
  • Trusted by 20,000+ developers worldwide
  • One API call runs five checks on a single page fetch instead of five separate requests
  • Single boolean verdict for build pipelines to act on without parsing prose
  • False-positive filtering eliminates unreliable findings
  • Quality score based on issue variety, not count, capping best-practice impact
  • Free tools remain unlimited without account or daily limits
Free planNot given Not given
Open sourceNot given Not given
PlatformsNot given Not given
Public APINot given Not given
Community votes00
DR (Domain Rating by Ahrefs)22 +1 (up) since last check9 no change since last check
Trust Flow (Majestic)2110
Citation Flow (Majestic)3132
Referring domains (Majestic)278124

5 details filled in for both companies.

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