vastlint
Active·★ 19·Apache-2.0·Updated 2026-10-21
VASTlint is a high-performance VAST XML validator built on a pure-Rust core, designed to check ad tags against the IAB Tech Lab VAST specification. It ensures compliance across multiple VAST versions and various other internet standards, helping to prevent malformed tags that cause lost impressions and revenue discrepancies.
#VAST XML#Validator#Ad Tech#Rust#Linter#Static Analysis#High Performance#Multi-platform
01
Features
01High-performance VAST XML validation with sub-millisecond latency for real-time ad pipelines.
02Comprehensive rule set (232 rules) covering IAB VAST, W3C XML, URI syntax, MIME types, and more.
03Wide range of integrations including CLI, Docker, Rust library, Go, Java, Elixir, JavaScript/TypeScript (WASM), VS Code extension, Chrome extension, MCP server, and REST API.
04Auto-fix capabilities for common issues and enterprise readiness with zero runtime dependencies in the core.
05Verifiable build provenance (SLSA Build Level 2) and continuous fuzz-testing for security and reliability.
02
Compatibility
Rust
Runtime
Verified via docs
Go
Language/SDK
Verified via docs
Java
Language/SDK
Verified via docs
Elixir/Erlang
Language/SDK
Verified via docs
JavaScript/TypeScript
Language/Runtime
Verified via docs
Node.js
Runtime
Verified via docs
03
Quick start
1
$ cargo install vastlint
04
Use cases
↳In-process VAST validation within ad tech infrastructure such as SSPs, DSPs, and SSAI platforms to ensure real-time bid response quality.
↳Integrating into CI/CD pipelines to automatically check VAST tags for compliance before deployment.
↳Enhancing AI agents (e.g., Claude, Cursor) with `validate_vast` and `fix_vast` tools via Model Context Protocol (MCP) for automated creative trafficking.
↳Developer tooling through CLI, VS Code extension, and Chrome extension for manual inspection, validation, and fixing of VAST XML.
↳Providing VAST validation as a service via a hosted web validator or RapidAPI endpoint for external applications and quick checks.
05
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