VAST Inspector Guide

Use VAST Inspector to analyze tags, understand strict schema issues, validate wrapper chains, and preview ads safely.

Quick steps

  1. Paste a VAST URL or inline XML.
  2. Select a target VAST version (or keep Auto).
  3. Click Analyze to review results and errors.
  4. Preview only after a successful analysis.

What the results mean

  • Ad Serving: checks practical required fields for delivery.
  • Strict Schema: validates against the official XSD.
  • Compatibility: shows which VAST versions meet required fields.

Common issues

  • Macros like [ERRORCODE] can fail strict schema checks.
  • Wrapper tags must include VASTAdTagURI to resolve.
  • Preview requires a valid analysis before playback.

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