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WhatsDiff

CLI tool and MCP server to inspect what changed in Composer or npm dependencies after updates.

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What is WhatsDiff?

CLI tool and MCP server to inspect what changed in Composer or npm dependencies after updates. See it in our Development Tools collection.

Key benefits

  • WhatsDiff fits into a modern web development toolchain and can reduce boilerplate work.
  • Using WhatsDiff can improve developer productivity versus ad‑hoc scripts and manual processes.
  • WhatsDiff typically integrates with Git-based workflows, CI/CD, or popular runtimes and frameworks.

Use cases

  • Integrating WhatsDiff into your local dev or CI pipeline to automate repetitive work.
  • Using WhatsDiff to monitor, debug, or optimize applications in production.
  • Adopting WhatsDiff as a standard tool across your engineering team for consistency.

About WhatsDiff

WhatsDiff is a developer-focused CLI that answers the question, “What changed in my dependencies?” after running `composer update` or `npm update`. It analyzes lockfiles to surface added, removed, or updated packages and can compare dependency changes between commits, branches, or tags. The project also ships a terminal UI for browsing changelogs and release notes directly in your shell, plus multiple output formats for automation or CI. For AI workflows, WhatsDiff includes an MCP server so assistants can query dependency changes during code review or upgrade planning. It is open source with a dedicated documentation site and a public GitHub repository, making it easy to audit, self-host, and contribute.

Sources & review

  • dependencies
  • cli
  • diff
  • composer
  • npm

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