Codec | Schema Benchmarks

Some schema libraries support two way conversion of data, often referred to as "encoding" and "decoding".

We benchmark the time taken to encode and decode a Date to and from a string (usually an ISO 8601 string, but we don't enforce this).

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import * as z from "zod";

const dateFromString = z.codec(z.iso.datetime(), z.date(), {
  encode: (date) => date.toISOString(),
  decode: (str) => new Date(str),
});

dateFromString.encode(new Date(0)); // "1970-01-01T00:00:00.000Z"
dateFromString.decode("1970-01-01T00:00:00.000Z"); // Date

Invalid data

We don't benchmark codecs with invalid data, as many libraries require the input to be correctly typed before passing it to the codec.

Optimizations

None JIT Precompiled

Library	Version	Downloads (/wk)	Optimizations
`io-ts`	`2.2.22`	2.86M	None	561 ns	289 ns
`zod`	`4.3.6`	148.91M	JIT	938 ns	580 ns
`zod/mini`	`4.3.6`	148.91M	JIT	955 ns	581 ns
`effect`	`3.21.0`	9.14M	None	1 μs	894 ns
`effect@beta`	`4.0.0-beta.43`	9.14M	None	1 μs	685 ns
`effect@beta` (unknown)	`4.0.0-beta.43`	9.14M	None	1 μs	702 ns
`effect` (unknown)	`3.21.0`	9.14M	None	1 μs	882 ns
`typebox`	`1.1.11`	229.81K	JIT	4 μs	4 μs

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