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Comparison guide
Ajv vs Zod
AJV is 7x faster (14M ops/sec) but Zod infers TypeScript types automatically. Compare bundle size, performance, and DX for schema validation in 2026.
Quick Verdict
Smallest Bundle
Ajv
32.0 KB gzipped
Most Popular
Ajv
391.1M weekly downloads
Best Maintained
Zod
100/100 maintenance score
Highest Quality
Zod
80/100 quality score
Overall Pick
Ajv
Best all-around based on popularity, size, maintenance & quality
zod
TypeScript-first schema declaration and validation library with static type inference
324.3M weekly downloads · 86.5 KB gzip · Health 92/100
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Choosing between Ajv and Zod? Here's a data-driven comparison based on real npm data — downloads, bundle size, health scores, and more — to help you decide which package fits your project best.
Downloads & Popularity
Ajv leads with 391.1M weekly downloads — roughly 1.2x more. Zod has 324.3M weekly downloads. Higher download counts generally indicate broader community adoption and a larger ecosystem of tutorials, plugins, and support.
Bundle Size
Ajv has the smallest gzipped bundle at 32.0 KB. Zod comes in at 86.5 KB. A smaller bundle size means faster page loads, which improves user experience and Core Web Vitals scores.
Health Score Comparison
Zod has an overall health score of 92/100 (excellent), with strong maintenance, quality, security, popularity scores. Ajv has an overall health score of 73/100 (good), with strong security, popularity scores. Health scores are calculated from maintenance activity, code quality, security posture, popularity, and stability metrics.
When to Choose Each
Choose Ajv if you value massive community and ecosystem, strong security track record. Choose Zod if you value massive community and ecosystem, actively maintained, strong security track record.
Our Verdict
Both Ajv and Zod are solid choices for JavaScript development. Zod has the edge in overall health score (92/100), while each package brings unique strengths to the table. Evaluate them based on your project's priorities — whether that's community size, bundle efficiency, or maintenance activity — and choose the one that aligns best with your requirements.
Frequently Asked Questions
- Is ajv better than zod?
- It depends on your needs. Ajv has a health score of 73/100 while Zod scores 92/100. Ajv has more recorded weekly downloads (391.1M). Consider your specific requirements — bundle size, community support, and feature set — to decide which is the better fit.
- Which has a smaller bundle size, ajv or zod?
- Ajv has the smaller gzipped bundle at 32.0 KB. A smaller bundle means faster load times for your users, which can positively impact SEO and user experience.
- How many developers use ajv vs zod?
- Ajv has more recorded weekly downloads (391.1M). Download counts reflect package installations, not unique developers.
- Which is better maintained, ajv or zod?
- Zod has a maintenance score of 100/100. Ajv scores 60/100 and Zod scores 100/100 on maintenance.
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The 2026 JavaScript Stack Cheatsheet
One PDF: the best package for every category (ORMs, bundlers, auth, testing, state management). Used by 500+ devs. Free, updated monthly.