Ajv vs Zod: 3.9M vs 1.1M Validations per Second
ajv 8.20.0 (+ajv-formats 3.0.1) vs zod 4.6.5 on the same nested user shape as zod-vs-valibot. Warm medians (2k warmup + 9x50k): Ajv validate ok 3,933,337 ops/s vs zod.safeParse 1,138,406 (~3.5x). Bad input: Ajv allErrors 4,094,452 vs Zod 435,537 (~9.4x). Setup: Ajv new+addFormats+compile median 6.47 ms vs Zod build 0.17 ms; break-even ~10k validations. Browser gzip: Ajv runtime 41 KB, Ajv standalone 1.8 KB, Zod classic 93 KB, zod/mini 6.8 KB. Fixture /workspace/bench-ajv-zod/.
6 Oct 20266 min read