AgentIndex icon
AgentIndex
vastlint logo
vastlint
★ 19
vs
jscpd logo
jscpd
★ 6.4k

vastlint vs jscpd

vastlint: 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.; jscpd: jscpd is a powerful copy/paste detector for programming source code, capable of identifying duplicated blocks across more than 225 programming languages and digital formats. It features an AI-ready output, agent skills, and a Rust-powered engine for significantly faster detection performance.

01

TL;DR

vastlint logo
vastlintDev Tooling · ★ 19

In-process VAST validation within ad tech infrastructure such as SSPs, DSPs, and SSAI platforms to ensure real-time bid response quality.

Read vastlint full review →
jscpd logo
jscpdDev Tooling · ★ 6.4k

Identify and eliminate code duplication in large codebases to reduce technical debt and improve maintainability.

Read jscpd full review →
02

Side-by-Side Comparison

Field
vastlint logovastlint
jscpd logojscpd
Category
Dev Tooling
Dev Tooling
Stars
★ 19
★ 6.4k
License
Apache-2.0
MIT
Install Command
cargo install vastlint
npm install -g cpd
Updated
1d ago
1d ago
Open Source
Yes
Yes
Website
↗ Visit
↗ Visit
GitHub
↗ GitHub
↗ GitHub
Tags
VAST XML, Validator, Ad Tech
Code Duplication, Static Analysis, Code Quality
03

Features

vastlint logovastlint
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.
jscpd logojscpd
01Detects copy/paste duplications in over 225 programming languages and digital formats.
02AI-ready with token-efficient reporter and agent skills for integration into LLM workflows.
03Rust-powered engine (cpd) offers 10-30x faster detection performance.
04Supports Git blame with side-by-side comparison for author attribution in duplicated code.
05Multiple output reporters including console, HTML, JSON, SARIF (GitHub Code Scanning compatible), and custom reporters.
04

Use Cases

vastlint logovastlint
↳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.
jscpd logojscpd
↳Identify and eliminate code duplication in large codebases to reduce technical debt and improve maintainability.
↳Integrate into CI/CD pipelines (e.g., GitHub Super Linter) for automated code quality checks and preventing new duplications.
↳Assist AI agents in refactoring tasks by providing token-efficient duplication reports.
↳Generate comprehensive reports (HTML, SARIF) for code auditing and compliance purposes.
↳Use the MCP Server to expose duplication detection capabilities to AI assistants directly from an editor for on-demand checks.
05

Best For

vastlint logovastlint
—
jscpd logojscpd
EssentialTrending
FAQ

FAQ

What is the difference between vastlint and jscpd?
Both vastlint and jscpd are in the Dev Tooling category. vastlint has 19 stars, while jscpd has 6.4k stars.
Which is better, vastlint or jscpd?
The best choice depends on your use case. Choose vastlint if In-process VAST validation within ad tech infrastructure such as SSPs, DSPs, and SSAI platforms to ensure real-time bid response quality., and jscpd if Identify and eliminate code duplication in large codebases to reduce technical debt and improve maintainability..
Is vastlint free or open source?
Yes, vastlint is open source on GitHub (Apache-2.0).
Is jscpd free or open source?
Yes, jscpd is open source on GitHub (MIT).
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