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VAST Lint

5.0(

2 ratings

)
ExtensionDeveloper Tools9 users
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Item media 1 (screenshot) for VAST Lint
Item media 1 (screenshot) for VAST Lint
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Item media 3 (screenshot) for VAST Lint
Item media 4 (screenshot) for VAST Lint

Overview

Detect and validate VAST XML on any page. IAB VAST 2.0–4.3, SIMID, VPAID. 121 rules. Wrapper chains. By vastlint.org.

vastlint validates VAST XML ad tags directly in your browser — no copy-pasting into external tools. When you open a VAST XML URL, vastlint automatically: • Highlights every error, warning, and info issue inline on the correct line • Draws squiggly underlines under the offending XML element • Shows the rule ID and severity inline with the code • Displays the full error message and spec reference on hover • Links every rule to vastlint.org/docs for detailed fix guidance Supports VAST 2.0, 3.0, 4.0, 4.1, and 4.2. Built on vastlint — a fast, spec-accurate VAST validator written in Rust and compiled to WebAssembly. All validation runs locally in your browser. No data is sent to any server. Open source: github.com/aleksUIX/vastlint

Details

  • Version
    0.4.19
  • Updated
    June 1, 2026
  • Size
    243KiB
  • Languages
    English (United States)
  • Developer
    Email
    inbox@vastlint.org
  • Non-trader
    This developer has not identified itself as a trader. For consumers in the European Union, please note that consumer rights do not apply to contracts between you and this developer.

Privacy

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The developer has disclosed that it will not collect or use your data. To learn more, see the developer’s privacy policy.

This developer declares that your data is

  • Not being sold to third parties, outside of the approved use cases
  • Not being used or transferred for purposes that are unrelated to the item's core functionality
  • Not being used or transferred to determine creditworthiness or for lending purposes

Support

For help with questions, suggestions, or problems, visit the developer's support site

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