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.

Why AnyVali?

• 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

Install

npm install anyvali          # 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 / Kotlin / C++

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)

Quick Start

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

JavaScript / TypeScript	Python
import { string, int, object, array } from "anyvali"; 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)

Go example

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)
    }
}

Type Inference

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";

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

Cross-Language Schema Sharing

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!

Forms

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

import { object, string, int } from "anyvali";
import { initForm } from "anyvali/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";
import { createFormBindings } from "anyvali/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": "strip"
  },
  "definitions": {},
  "extensions": {}
}

Supported SDKs

Language	Package	Status
JavaScript / TypeScript	anyvali	v0.0.1
Python	anyvali	v0.0.1
Go	github.com/BetterCorp/AnyVali/sdk/go	v0.0.1
Java	com.anyvali:anyvali	v0.0.1
C#	AnyVali	v0.0.1
Rust	anyvali	v0.0.1
PHP	anyvali/anyvali	v0.0.1
Ruby	anyvali	v0.0.1
Kotlin	com.anyvali:anyvali	v0.0.1
C++	anyvali (CMake)	v0.0.1

CLI & HTTP API

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.

Schema Types

Category	Types
Primitives	string, bool, null
Numbers	number (float64), int (int64), float32, float64, int8-int64, uint8-uint64
Special	any, unknown, never
Values	literal, enum
Collections	array, tuple, object, record
Composition	union, intersection
Modifiers	optional, nullable

Documentation

Guide	Description
Getting Started	Installation, API reference, examples
Numeric Semantics	Why number = float64 and int = int64
Portability Guide	Design schemas that work across all languages
SDK Authors Guide	Implement a new AnyVali SDK
Canonical Spec	The normative specification
JSON Format	Interchange format details
CLI Reference	Command-line validation tool
HTTP API	Validation microservice / sidecar
Development	Building, testing, contributing

Repository Layout

.
├── 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

Contributing

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

License

AnyVali is licensed under the MIT License.

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anyvali.com