v4.1.12

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Commits:

• 0b109c3 docs(ecosystem): add bupkis to the ecosystem section (#​5237)
• d22ec0d docs(ecosystem): add upfetch (#​5238)
• c56a4f6 docs(ecosystem): addeslint-plugin-zod-x (#​5261)
• a0abcc0 docs(metadata.mdx): fix a mistake in an example output (#​5248)
• 62bf4e4 fix(ZodError): prevent flatten() from crashing on 'toString' key (#​5266)
• 02a5840 refac(errors): Unify code structure and improve types (#​5278)
• 4b1922a docs(content/v4/index): fix zod version (#​5289)
• 3fcb20f Add frrm to ecosystem (#​5292)
• fda4c7c Make docs work without token
• af44738 Fix lint
• 77c3c9f Export bg.ts
• 3b94610 v4.1.12

v4.1.11

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Commits:

• 2bed4b3 4.1.11

v4.1.10

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Commits:

• 7ffedd0 Fix shape caching (#​5263)
• 82cd717 v4.1.10

v4.1.9

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Commits:

• a78716d Update zshy (#​5249)
• 923af80 Publish zod@​4.1.9

v4.1.8

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Commits:

• 36c4ee3 Switch back to weakmap
• a1726d5 4.1.8

v4.1.7

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Commits:

• 0cca351 Fix variable name inconsistency in coercion documentation (#​5188)
• aa78c27 Add copy/edit buttons
• 76452d4 Update button txt
• 937f73c Fix tsconfig issue in bench
• 976b436 v4.1.6 (#​5222)
• 4309c61 Fix cidrv6 validation - cidrv6 should reject invalid strings with multiple slashes (#​5196)
• ef95a73 feat(locales): Add Lithuanian (lt) locale (#​5210)
• 3803f3f docs: update wrong contents in codeblocks inapi.mdx (#​5209)
• 8a47d5c docs: update coerce example inapi.mdx (#​5207)
• e87db13 feat(locales): Add Georgian (ka) locale (#​5203)
• c54b123 docs: adds@traversable/zod and@traversable/zod-test to v4 ecosystem (#​5194)
• c27a294 Fix two tiny grammatical errors in the docs. (#​5193)
• 23a2d66 docs: fix broken links in async refinements and transforms references (#​5190)
• 845a230 fix(locales): Add type name translations to Spanish locale (#​5187)
• 27f13d6 Improve regex precision and eliminate duplicates in regexes.ts (#​5181)
• a8a52b3 fix(v4): fix Khmer and Ukrainian locales (#​5177)
• 887e37c Update slugs
• e1f1948 fix(v4): ensure array defaults are shallow-cloned (#​5173)
• 9f65038 docs(ecosystem): add DRZL; fix Prisma Zod Generator placement (#​5215)
• aa6f0f0 More fixes (#​5223)
• aab3356 4.1.7

v4.1.6

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v4.1.5

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Commits:

• 530415f Update docs
• b7b081d Update z.function() type to support array input (#​5170)
• 780cf57 4.1.5

v4.1.4

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Commits:

• 3291c61 fix(v4): toJSONSchema - wrong tuple withnull output when targetingopenapi-3.0 (#​5156)
• 23f41c7 test(v4): toJSONSchema - usevalidateOpenAPI30Schema in all relevant scenarios (#​5163)
• 0a09fd2 Update installation instructions
• 4ea5fec 4.1.4

v4.1.3

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Commits:

• 98ff675 Drop stringToBoolean
• a410616 Fix typo
• 0cf4589 fix(v4): toJSONSchema - add missing oneOf inside items in tuple conversion (#​5146)
• 8bf0c16 fix(v4): toJSONSchema tuple path handling for draft-7 with metadata IDs (#​5152)
• 5c5fa90 fix(v4): toJSONSchema - wrong record output when targetingopenapi-3.0 (#​5141)
• 87b97cc docs(codecs): update example to use payloadSchema (#​5150)
• 309f358 fix(v4): toJSONSchema - output numbers with exclusive range correctly when targetingopenapi-3.0 (#​5139)
• 1e71ca9 docs: fix refine fn to encode works properly (#​5148)
• a85ec3c fix(docs): correct example to useLooseDog instead ofDog (#​5136)
• 3e98274 4.1.3

v4.1.2

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Commits:

• e45e61b Improve codec docs
• 25a4c37 fix(v4): toJSONSchema - wrong record tuple output when targetingopenapi-3.0 (#​5145)
• 0fa4f46 Use method form in codecs.mdx
• 940383d Update JSON codec and docs
• 3009fa8 4.1.2

v4.1.1

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Commits:

• 648eb43 Remove codecs from sidebare
• 7e39a99 Improve codec docs
• e5085be Add images
• 028b289 Add methods
• 10cc994 4.1.1

v4.1.0

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The first minor version since the introduction of Zod 4 back in May. This version contains a number of features that barely missed the cut for the 4.0 release. With Zod 4 stable and widely adopted, there's more time to resume feature development.

Codecs

This is the flagship feature of this release. Codecs are a new API & schema type that encapsulates abi-directional transformation. It's a huge missing piece in Zod that's finally filled, and it unlocks some totally new ways to use Zod.

conststringToDate=z.codec(z.iso.datetime(),// input schema: ISO date stringz.date(),// output schema: Date object{decode:(isoString)=>newDate(isoString),encode:(date)=>date.toISOString(),});

New top-level functions are added for processing inputs in theforward direction ("decoding") andbackward direction ("encoding").

stringToDate.decode("2025-08-21T20:59:45.500Z")// => DatestringToDate.encode(newDate())// => "2025-08-21T20:59:45.500Z"

Note — For bundle size reasons, these new methods have not added to Zod Mini schemas. Instead, this functionality is available via equivalent top-level functions.

// equivalent at runtimez.decode(stringToDate,"2024-01-15T10:30:00.000Z");z.encode(stringToDate,newDate());

.parse() vs.decode()

Both.parse() anddecode() process data in the "forward" direction. They behave identically at runtime.

stringToDate.parse("2025-08-21T20:59:45.500Z");stringToDate.decode("2025-08-21T20:59:45.500Z");

There is an important difference however. While.parse() accepts any input,.decode() expects astrongly typed input. That is, it expects an input of typestring, whereas.parse() acceptsunknown.

stringToDate.parse(Symbol('not-a-string'));// => fails at runtime, but no TypeScript errorstringToDate.decode(Symbol("not-a-string"));//                     ^ ❌ Argument of type 'symbol' is not assignable to parameter of type 'Date'. ts(2345)

This is a highly requested feature unto itself:

• #​3860
• #​1748
• #​3978
• #​1892

Encoding

You can use any Zod schema with.encode(). The vast majority of Zod schemas arenon-transforming (the input and output types are identical) so.decode() and.encode() behave identically. Only certain schema types change their behavior:

• Codecs — runs fromB->A and executes theencode transform during encoding
• Pipes — these executeB->A instead ofA->B
• Defaults and prefaults — Only applied in the forward direction
• Catch — Only applied in the forward direction

Note — To avoid increasing bundle size unnecessarily, these new methods are not available on Zod Mini schemas. For those schemas, equivalent top-level functions are provided.

The usualasync andsafe variants exist as well:

// decode methodsstringToDate.decode("2024-01-15T10:30:00.000Z")awaitstringToDate.decodeAsync("2024-01-15T10:30:00.000Z")stringToDate.safeDecode("2024-01-15T10:30:00.000Z")awaitstringToDate.safeDecodeAsync("2024-01-15T10:30:00.000Z")// encode methodsstringToDate.encode(newDate())awaitstringToDate.encodeAsync(newDate())stringToDate.safeEncode(newDate())awaitstringToDate.safeEncodeAsync(newDate())

Example codecs

Below are some "worked examples" for some commonly-needed codecs. These examples are all tested internally for correctness. Just copy/paste them into your project as needed. There is a more comprehensive set available atzod.dev/codecs.

stringToBigInt

Convertsbigint into a serializable form.

const stringToBigInt = z.codec(z.string(), z.bigint(), {  decode: (str) => BigInt(str),  encode: (bigint) => bigint.toString(),});stringToBigInt.decode("12345");  // => 12345nstringToBigInt.encode(12345n);   // => "12345"

json

Parses/stringifies JSON data.

constjsonCodec=z.codec(z.string(),z.json(),{decode:(jsonString,ctx)=>{try{returnJSON.parse(jsonString);}catch(err:any){ctx.issues.push({code:"invalid_format",format:"json_string",input:jsonString,message:err.message,});returnz.NEVER;}},encode:(value)=>JSON.stringify(value),});

To further validate the data,.pipe() the result of this codec into another schema.

constParams=z.object({name:z.string(),age:z.number()});constJsonToParams=jsonCodec.pipe(Params);JsonToParams.decode('{"name":"Alice","age":30}');// => { name: "Alice", age: 30 }JsonToParams.encode({name:"Bob",age:25});// => '{"name":"Bob","age":25}'

Further reading

For more examples and a technical breakdown of how encoding works, reads theannouncement blog post andnew Codecs docs page. The docs page contains implementations for several other commonly-needed codecs:

• stringToNumber
• stringToInt
• stringToBigInt
• numberToBigInt
• isoDatetimeToDate
• epochSecondsToDate
• epochMillisToDate
• jsonCodec
• utf8ToBytes
• bytesToUtf8
• base64ToBytes
• base64urlToBytes
• hexToBytes
• stringToURL
• stringToHttpURL
• uriComponent
• stringToBoolean

.safeExtend()

The existing way to add additional fields to an object is to use.extend().

constA=z.object({a:z.string()})constB=A.extend({b:z.string()})

Unfortunately this is a bit of a misnomer, as it allows you to overwrite existing fields. This means the result of.extend() may not literallyextend the original type (in the TypeScript sense).

constA=z.object({a:z.string()})// { a: string }constB=A.extend({a:z.number()})// { a: number }

To enforce trueextends logic, Zod 4.1 introduces a new.safeExtend() method. This statically enforces that the newly added properties conform to the existing ones.

z.object({a:z.string()}).safeExtend({a:z.number().min(5)});// ✅z.object({a:z.string()}).safeExtend({a:z.any()});// ✅z.object({a:z.string()}).safeExtend({a:z.number()});//                                       ^  ❌ ZodNumber is not assignable

Importantly, this new API allows you to safely extend objects containing refinements.

constAB=z.object({a:z.string(),b:z.string()}).refine(val=>val.a===val.b);constABC=AB.safeExtend({c:z.string()});// ABC includes the refinements defined on AB

Previously (in Zod 4.x) any refinements attached to the base schema were dropped in the extended result. This was too unexpected. It now throws an error. (Zod 3 did not support extension of refined objects either.)

z.hash()

A new top-level string format for validating hashes produced using various common algorithms & encodings.

constmd5Schema=z.hash("md5");// => ZodCustomStringFormat<"md5_hex">constsha256Base64=z.hash("sha256",{enc:"base64"});// => ZodCustomStringFormat<"sha256_base64">

The following hash algorithms and encodings are supported. Each cell provides information about the expected number of characters/padding.

z.hex()

To validate hexadecimal strings of any length.

consthexSchema=z.hex();hexSchema.parse("123abc");// ✅ "123abc"hexSchema.parse("DEADBEEF");// ✅ "DEADBEEF"hexSchema.parse("xyz");// ❌ ZodError

Additional changes

1. z.uuid() now supports the "Max UUID" (FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF) per theRFC
2. $ZodFunction is now a subtype of$ZodType

Commits

• edd4fea - Closes#​5127
• 5d4a315 - Closes#​5116
• f3f0955 - Closes#​5108
• 0114d5b -#​5122
• 3b077c3 -#​5121
• 1e06af8 -#​5113
• b01b6f3 —#​5052
• 571ab0c —#​5051
• d3ea111 —#​5049
• b8e3f87 —#​4865

v4.0.17

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Commits:

• 1cebf33 Add blog (#​5074)
• fc1e556 Fixes#​5073
• cc63f95 v4.0.17

v4.0.16

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Commits:

• d589186 fix: ensure keyof returns enum (#​5045)
• 4975f3a feat: add discriminator generic (#​5044)
• 0a463e3 Update speakeasy files
• 12658af Fix Edit page buttons
• 47e6604 fix:edit this page button, now redirects to correct url using the new path (#​5056)
• 7207a2d Update Hey API link to Zod v3 plugin (#​5060)
• 6887ff3 Update Hey API link to Zod plugin (#​5059)
• ffff1aa Clone POJO objects during defaulting/prefaulting
• a227cb3 v4.0.16

v4.0.15

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Commits:

• 7e7e346 Clean up docs
• f2949a8 [docs] Fix migration guide upgrade command (#​5021)
• d43cf19 Fix recursive object initialization errors with check() and other methods (#​5018)
• 3de2b63 fix: remove redundant Required<> from input and output type definitions (#​5033)
• 93553bd Add needs info
• 03cfa8d 4.0.15

v4.0.14

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Commits:

• 99391a8 Docs: Fix typo (#​5005)
• e25303e Docs: fix typo (#​5008)
• dbb05ef Add JSON Schema draft-04 output (#​4811)
• b8257d7 Improve tuple recursive inference.
• 9bdbc2f Avoid infinite loops in defineLazy. Fixes#​4994.
• af96ad4 4.0.14

v4.0.13

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Commits:

• 362eb33 Fix optional + pipe handling. Closes#​5002. v4.0.13

v4.0.12

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Commits:

• ff83fc9 Add eslint-plugin-import-zod (#​4848)
• 7c9ce38 Update docs for z.property check (#​4863)
• c432577 docs: add jwt schema docs (#​4867)
• 35e6a6f Add llms.txt (#​4915)
• 3ac7bf0 Clean up Edit this Page
• 60a9372 Implementllms-full.txt (#​5004)
• 73a1970 4.0.12

v4.0.11

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Commits:

• 8e6a5f8 Fix “Edit on Github” link (#​4997)
• 930a2f6 Fix number of errors in doc (#​4993)
• c762dbb feat(locale): Add Yoruba (yo) locale (#​4996)
• 9a34a3a Zod 4.0.11 (#​4981)

v4.0.10

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Commits:

• 291c1ca Add should-build script
• e32d99b Move should-build script
• d4faf71 Add v3 docs (#​4972)
• dfae371 Update Jazz img on v3 docs
• d6cd30d fix#​4973 (#​4974)
• 1850496 Fix typo invalype (#​4960)
• 4ec2f87 Add Zod Playground to zod 4 ecosystem (#​4975)
• 2b571a2 Update docs z.enum with object literal example (#​4967)
• 813451d v4.0.10 (#​4978)

v4.0.9

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Commits:

• 4e7a3ef v4.0.9 (#​4970)

v4.0.8

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Commits:

• 3048d14 Fix#​4961

v4.0.7

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Commits:

• 7ab1b3c Do not continue parsing in ZodPipe if issues exists. Closes#​4926.
• 34b400a 4.0.7

v4.0.6

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Commits:

• a3e4391 Unwiden catch input type (#​4870)
• 499df78 Add RFC 9562 mentions. Closes#​4872
• d0493f3 Doc tweak - spread vs destructuring (#​4919)
• 8dad394 feat: Icelandic translation (#​4920)
• 2ffdae1 Bulgarian (bg) translation (#​4928)
• 0973135 docs: add valype to xToZodConverts (#​4930)
• d257340 Remove moduleResolution callout (#​4932)
• 075970d docs: add coercion note to fix compile errors (#​4940)
• b9e8a60 Add@hey-api/openapi-ts to Zod 3 ecosystem (#​4949)
• ad7b0ff Add@hey-api/openapi-ts to Zod 3 ecosystem (#​4942)
• 4619109 feat(locales): add Danish translations (#​4953)
• cb84a57 Point to zod-v3-to-v4 codemod in Zod 4 migration guide (#​4954)
• 28a5091 Update api.mdx (#​4955)
• 7f3cf94 Fix URL sup example (#​4959)
• 17e7f3b Add@hey-api/openapi-ts to Zod 4 ecosystem (#​4950)
• f75d852 fix: escapes decimal place inz.literal (#​4895)
• 7dd7484 v4.0.6 (#​4941)

v4.0.5

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Commits:

• f91a73e Support pipes in discriminated unions. Closes#​4856 (#​4861)
• 45afab0 4.0.5

v4.0.4

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Commits:

• 9335f05 AddsZodFirstPartyTypeKind stub to fix module resolution failure insidezod-to-json-schema

v4.0.3

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Commits:

• 5905a8d Improve check-versions script
• f3e749b Remove global File interface
• 44a936c 4.0.2
• 74006ed Fix JSR provenance
• ff4af5e 4.0.3
• ce573e8 Update test badge
• 9a7161a Fix versions

v4.0.2

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v4.0.1: v4.0.0

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With this release,zod@4.0.0 has been published tonpm. There were no code changes between 3.25.76 and 4.0.0!

Zod 4 has been stable for the past 6 weeks, but it was published insidezod@3.25.x on npm. this transitionary window gave the ecosystem time to incrementally support for Zod 4 (without dropping support for Zod 3). As there is now near-universal support for Zod 4 in the ecosystem, ths time feels right to finally put a bow on things 🎀

To upgrade to Zod 4:

npm upgrade zod@^4.0.0

If you’ve already migrated to Zod 4 using the subpaths, there are no changes required. however you can optionally simplify your imports (recommended)

// after upgrading to zod@4.0.0:import*aszfrom"zod";// Zod 4 (regular)import*aszfrom"zod/mini"// Zod 4 Mini// these still work, but are no longer neededimport*aszfrom"zod/v4";import*aszfrom"zod/v4-mini":// if you still need Zod 3import*aszfrom"zod/v3";// Zod 3

Library authors — if you've already implemented Zod 4 support according to the best practices outlined in theLibrary authors guide, bump your peer dependency to includezod@^4.0.0:

// package.json{"peerDependencies": {"zod":"^3.25.0 || ^4.0.0"  }}

There should be no other code changes necessary. No code changes were made between the latest3.25.x release and4.0.0. This does not require a major version bump.

v4.0.0

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v3.25.76

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Commits:

• 91c9ca6 fix: cleanup _idmap of $ZodRegistry (#​4837)
• 9cce1c5 docs: fix typo in flattenError example on error-formatting page (#​4819) (#​4833)
• a3560ae v3.25.76 (#​4838)
• 5060661 Release 3.25.76
• 7baee4e Update index.mdx (#​4831)

v3.25.75

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Commits:

• c5f349b Fix z.undefined() behavior in toJSONSchema

v3.25.74

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Commits:

• ae0dbe1 Partial record
• 39c5f71 3.25.74

v3.25.73

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Commits:

• 1021d3c v3.25.73 (#​4822)

v3.25.72

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Commits:

• 4a4dac7 Warn about id uniqueness check on Metadata page (#​4782)
• 7a5838d feat(locale): Add Esperanto (eo) locale (#​4743)
• 36fe14e Fix optionality of schemas (#​4769)
• 20c8c4b Fix re-export bug
• 8b0df10 3.25.72

v3.25.71

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Commits:

• 66a0f34 Move source to/src (#​4808)
• 2a15f44 3.25.71

v3.25.70

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Commits:

• bd81c7c Add ecosystem listing to homepage
• 1ddb971 Add Mobb to sponsors
• 30ba440 Clean up ecosystem.mdx
• 0ef1b85 Addsvelte-jsonschema-form to form integrations (#​4784)
• 14715f1 docs: fix Lambda spelling (#​4804)
• f6da030 Add back src (#​4806)
• 364200a Revert "Add back src (#​4806)"
• 16e1b67 v3.25.70 (#​4807)

v3.25.69

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Commits:

• f46946c Improve release workflow
• b6fe831 Do not clobber defaults in
• 7f986d0 Skip attw test if Zod isn't built
• 5576182 Addexact totoo_big/too_small issue formats (#​4802)
• 8fd2fc3 3.25.69

v3.25.68

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Commits:

• d3e0f86 feat: add zod-xlsx back to the ecosystem.tsx (#​4718)
• 86112d9 chore: update lint-staged from v12 to v16 (#​4703)
• 218a267 chore: remove unused octokit (#​4708)
• a7cb6ed fix(v4): add exact to length check issue (#​4617)
• b888170 Close#​4035
• 5879baf Fix fmt
• bd1bdda Fix build
• ddadfb8 Simplify basics, document reportInput
• d5e2368 Addz.stringFormat() (#​4737)
• ee5615d Drop example and examples entirely
• 4080fd9 Add treeshaking discussion to docs
• cf6157a Docs
• 39947ac Use import star everywhere
• 7e296ae WIP
• bb42be4 Update treeshake target
• 0a49fa3 Improve mini docs
• 1b0a5e5 Add dep
• 90fa0cd Switch tozshy (#​4777)
• af3841b Rename play.ts
• cf12ccf 3.25.68
• 34ae421 Update snapshot

v3.25.67

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Commits:

• 7afe790 Make $ZodLiteralDef generic
• 91274c3 3.25.67
• c22944b Fix race condition

v3.25.66

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Commits:

• 2b3e87b Update api.ts (#​4724)
• 100e9aa chore: include zod-validation-error to Ecosystem page (#​4722)
• de3517e fix(docs): prevent FOUC on website homepage logo (#​4716)
• 222a663 Change ZodObject default to $strip. Set inst.shape in zod mini
• fb00618 3.25.66

v3.25.65

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Commits:

• 6530994 Clean up ecosystem
• 131fdbd fix(docs): Use array as argument of templateLiteral (#​4701)
• [ed648b1](https://redirect.github.com/colinhacks/zod/commit/ed648b