AnyVali

Native validation libraries for 10 languages, one portable schema model.

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AnyVali lets you write validation schemas in your language, then share them across any of 10 supported runtimes via a portable JSON format. Think Zod, but for every language.

• Write schemas natively -- idiomatic APIs for each language, not a separate DSL
• Share across languages -- export to JSON, import in any other SDK
• Safe numeric defaults -- number = float64, int = int64 everywhere
• Deterministic parsing -- coerce, default, then validate, in that order
• Conformance tested -- shared test corpus ensures identical behavior across SDKs

npm install @anyvali/js      # JavaScript / TypeScript
pip install anyvali           # Python
go get github.com/BetterCorp/AnyVali/sdk/go  # Go
cargo add anyvali             # Rust
dotnet add package AnyVali    # C#
composer require anyvali/anyvali  # PHP
gem install anyvali           # Ruby

Java (Maven)

<dependency>
  <groupId>com.anyvali</groupId>
  <artifactId>anyvali</artifactId>
  <version>0.0.1</version>
</dependency>

Kotlin (Gradle)

implementation("com.anyvali:anyvali:0.0.1")

C++ (CMake)

FetchContent_Declare(anyvali GIT_REPOSITORY https://github.com/BetterCorp/AnyVali)
FetchContent_MakeAvailable(anyvali)
target_link_libraries(your_target PRIVATE anyvali)

Define a schema, parse input, get structured errors or clean data.

import { string, int, object, array } from "@anyvali/js";

const User = object({
  name:  string().minLength(1),
  email: string().format('email'),
  age:   int().min(0).optional(),
  tags:  array(string()).maxItems(5),
});

// Throws on failure
const user = User.parse(input);

// Or get a result object
const result = User.safeParse(input);
if (!result.success) {
  console.log(result.issues);
}

import anyvali as v

User = v.object_({
    "name":  v.string().min_length(1),
    "email": v.string().format("email"),
    "age":   v.int_().min(0).optional(),
    "tags":  v.array(v.string()).max_items(5),
})

# Raises on failure
user = User.parse(input_data)

# Or get a result object
result = User.safe_parse(input_data)
if not result.success:
    print(result.issues)

import av "github.com/BetterCorp/AnyVali/sdk/go"

User := av.Object(map[string]av.Schema{
    "name":  av.String().MinLength(1),
    "email": av.String().Format("email"),
    "age":   av.Optional(av.Int().Min(0)),
    "tags":  av.Array(av.String()).MaxItems(5),
})

result := User.SafeParse(input)
if !result.Success {
    for _, issue := range result.Issues {
        fmt.Printf("[%s] %s at %v\n", issue.Code, issue.Message, issue.Path)
    }
}

All 10 SDKs now provide static type inference, so parsed values carry the correct type without manual casts. The TypeScript SDK offers full Zod-style Infer<T>:

import { object, string, int, type Infer } from "@anyvali/js";

const User = object({
  name: string().minLength(1),
  email: string().format('email'),
  age: int().min(0).optional(),
});

type User = Infer<typeof User>;
// => { name: string; email: string; age?: number | undefined }

const user = User.parse(input); // fully typed, no cast needed

Other SDKs use the type inference mechanism native to each language:

• Python -- BaseSchema(Generic[T]), ParseResult(Generic[T]); parse() returns T
• C# / Kotlin -- Schema<T> generic base class, ParseResult<T>
• Java -- Schema<T> generic base, ParseResult<T> record
• Go -- TypedParse[T]() and TypedSafeParse[T]() generic helper functions
• Rust -- TypedSchema trait with associated Output type, parse_as<T>() free function
• C++ -- Template parse_as<T>() and safe_parse_as<T>() helpers
• PHP -- @template phpDoc annotations for PHPStan/Psalm
• Ruby -- RBS type signature file for Steep/Sorbet

AnyVali's core feature: export a schema from one language, import it in another.

// TypeScript frontend -- export
const doc = User.export();
const json = JSON.stringify(doc);
// Send to your backend, save to DB, put in a config file...

# Python backend -- import
import json, anyvali as v

schema = v.import_schema(json.loads(schema_json))
result = schema.safe_parse(request_body)  # Same validation rules!

The JS SDK also ships a small forms layer for browser-native fields, HTML5 attributes, and AnyVali validation.

import { object, string, int } from "@anyvali/js";
import { initForm } from "@anyvali/js/forms";

const Signup = object({
  email: string().format("email"),
  age: int().min(18),
});

initForm("#signup", { schema: Signup });

<form id="signup">
  <input name="email" type="email" />
  <input name="age" type="number" />
  <button type="submit">Create account</button>
</form>

For JSX-style attribute binding:

import { object, string } from "@anyvali/js";
import { createFormBindings } from "@anyvali/js/forms";

const Signup = object({
  email: string().format("email"),
});

const form = createFormBindings({ schema: Signup });

<input {...form.field("email")} />;

The portable JSON format:

{
  "anyvaliVersion": "1.0",
  "schemaVersion": "1",
  "root": {
    "kind": "object",
    "properties": {
      "name": { "kind": "string", "minLength": 1 },
      "email": { "kind": "string", "format": "email" }
    },
    "required": ["name", "email"],
    "unknownKeys": "reject"
  },
  "definitions": {},
  "extensions": {}
}

Don't need an SDK? Use AnyVali from the command line or as a validation microservice.

# Validate from the command line
anyvali validate schema.json '{"name": "Alice", "email": "alice@test.com"}'

# Pipe from stdin
cat payload.json | anyvali validate schema.json -

# Start a validation server
anyvali serve --port 8080 --schemas ./schemas/

# Validate via HTTP
curl -X POST http://localhost:8080/validate/user \
  -H "Content-Type: application/json" \
  -d '{"name": "Alice", "email": "alice@test.com"}'

Pre-built binaries for Linux, macOS, and Windows are available on the releases page. Docker image: docker pull anyvali/cli.

See the CLI Reference and HTTP API Reference for full documentation.

.
├── docs/           Documentation guides
├── spec/           Canonical spec, JSON format, conformance corpus
├── sdk/
│   ├── js/         JavaScript / TypeScript SDK
│   ├── python/     Python SDK
│   ├── go/         Go SDK
│   ├── java/       Java SDK
│   ├── csharp/     C# SDK
│   ├── rust/       Rust SDK
│   ├── php/        PHP SDK
│   ├── ruby/       Ruby SDK
│   ├── kotlin/     Kotlin SDK
│   └── cpp/        C++ SDK
├── cli/            CLI binary and HTTP API server (Go)
├── runner.sh       Build/test/CI runner
└── site/           anyvali.com source

Contributions are welcome. Please read CONTRIBUTING.md before opening a pull request.

./runner.sh help       # See all commands
./runner.sh test js    # Test a specific SDK
./runner.sh ci         # Run the full CI pipeline locally
pwsh -File tools/release/build_release.ps1  # Build release artifacts with Docker

AnyVali is licensed under the MIT License.

anyvali.com