Summary
Zod 4 is a major breaking release with real performance wins and faster TypeScript compilation, but you'll need to update your code. The biggest gotchas are z.record() now requiring two arguments instead of one, strict objects moving from .strict() to z.strictObject(), and .default() behavior changing in ways that'll bite you if you're using transforms. This guide walks through the migration with a quick reference table, covers new features like z.file() and z.templateLiteral(), and includes find-replace patterns for the common breaks. If you're maintaining a Zod 3 codebase or starting fresh with v4, this gives you the specifics without having to dig through changelog noise.
Install to Claude Code
npx -y skills add kastalien-research/thoughtbox-dot-claude --skill zod4 --agent claude-codeInstalls into .claude/skills of the current project.
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Featured
Keep your Mac awake while Claude Code and 40+ AI agents run. Sleeps when they're idle.
One time payment $9 →Integrate web data into your AI product. One API to scrape website & brand data.
Get API Key Now →Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →On Capafy, your Skill runs online 24/7 as an agent product, and you get paid every time someone uses it.
Start earning →
