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VAST Lint

ExtensionDeveloper Tools3 users
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Item media 4 (screenshot) for VAST Lint
Item media 1 (screenshot) for VAST Lint
Item media 1 (screenshot) for VAST Lint
Item media 2 (screenshot) for VAST Lint
Item media 3 (screenshot) for VAST Lint
Item media 4 (screenshot) for VAST Lint

Overview

Detects VAST XML on the page and shows inline validation errors & warnings powered by vastlint.

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
    0.3.7
  • Updated
    April 29, 2026
  • Size
    272KiB
  • 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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