JSON to Valibot Schema Generator

JSON to Valibot Schema Generator (Modular TypeScript Validation)

Transform JSON data into lightweight, tree-shakable Valibot schema definitions with v.object, v.string, v.number, and array validators.

Presets:
Root Schema Name:
Object Strictness:
Null Handling:
Indentation:
Source JSON Payload
import * as v from 'valibot';

export const RootPaymentSummarySchema = v.object({
  currency: v.string(),
  subtotal: v.pipe(v.number(), v.integer()),
  tax: v.number(),
  shippingFee: v.pipe(v.number(), v.integer()),
  grandTotal: v.number(),
  transactionRef: v.string(),
  status: v.string()
});
export type RootPaymentSummary = v.InferOutput<typeof RootPaymentSummarySchema>;

export const RootItemsItemSchema = v.object({
  sku: v.string(),
  title: v.string(),
  quantity: v.pipe(v.number(), v.integer()),
  unitPrice: v.number(),
  discount: v.nullable(v.number()),
  tags: v.array(v.string()),
  inStock: v.boolean()
});
export type RootItemsItem = v.InferOutput<typeof RootItemsItemSchema>;

export const RootShippingAddressSchema = v.object({
  street: v.string(),
  suite: v.string(),
  city: v.string(),
  state: v.string(),
  postalCode: v.string(),
  country: v.string(),
  coordinates: RootShippingAddressCoordinatesSchema
});
export type RootShippingAddress = v.InferOutput<typeof RootShippingAddressSchema>;

export const RootShippingAddressCoordinatesSchema = v.object({
  latitude: v.number(),
  longitude: v.number()
});
export type RootShippingAddressCoordinates = v.InferOutput<typeof RootShippingAddressCoordinatesSchema>;

export const RootCustomerSchema = v.object({
  id: v.pipe(v.number(), v.integer()),
  fullName: v.string(),
  email: v.pipe(v.string(), v.email()),
  phone: v.string(),
  tier: v.string(),
  loyaltyPoints: v.pipe(v.number(), v.integer())
});
export type RootCustomer = v.InferOutput<typeof RootCustomerSchema>;

export const RootSchema = v.object({
  orderId: v.pipe(v.string(), v.uuid()),
  orderNumber: v.string(),
  createdAt: v.pipe(v.string(), v.isoTimestamp()),
  isFulfilled: v.boolean(),
  customer: RootCustomerSchema,
  shippingAddress: RootShippingAddressSchema,
  items: v.array(RootItemsItemSchema),
  paymentSummary: RootPaymentSummarySchema
});

export type Root = v.InferOutput<typeof RootSchema>;
Active Schemas
6 Definitions
Validators Inferred
63 Rules
Tree-Shaking Impact
< 1 KB (vs ~14KB Zod)

100% Client-Side AST Inference

Deep JSON parsing and Valibot schema synthesis run entirely in your local browser sandbox with zero network telemetry.

Modular & Tree-Shakable Architecture

Generates lightweight v.object() and modular import { object, string } syntax to keep client bundle sizes under 1KB.

Smart Type & Constraint Detection

Automatically detects emails, UUIDs, ISO datetimes, URLs, and numeric integer constraints with configurable strictness.

Technical Reference & Architecture Guide

JSON to Valibot Schema Generator (Modular TypeScript Validation) — Reference Guide

Transform JSON data into lightweight, tree-shakable Valibot schema definitions with v.object, v.string, v.number, and array validators.

Key Parameters & Controls

Root Schema NameString

Identifier name for the exported top-level Valibot schema and inferred TypeScript type.

Default: RootSchema
Import Syntax StyleEnum (namespace | named)

Selects between namespace import (import * as v from 'valibot') and modular named imports (import { object, string } from 'valibot').

Default: namespace
Type Inference ExportBoolean

Appends an exported TypeScript static type definition inferred via v.InferOutput<typeof Schema>.

Default: true
Nullish Field StrategyEnum (nullish | optional | nullable)

Configures the wrapper helper used for missing or null properties in JSON objects.

Default: nullish

Pro Tips & Best Practices

Tree-Shaking and Bundle Optimization

Valibot schemas leverage function-based modularity. Use named imports in frontend bundles to achieve up to 95% smaller bundle footprints compared to monolithic validator libraries like Zod.

Enhanced Constraints with Pipelines

Enhance primitive validators by piping validation actions: chain v.pipe(v.string(), v.email(), v.trim()) onto generated schemas for strict runtime sanitization.

Resilient Error Handling with safeParse

Prefer v.safeParse(RootSchema, data) over throwing v.parse() in API route handlers and form submissions to capture structured typed issues without crashing the runtime.

Common Gotchas & Troubleshooting

Invalid identifier or syntax error on keys with hyphens or spaces

Keys containing hyphens, spaces, or reserved words must be quoted as object properties. The generator automatically wraps non-standard keys in quotes.

Heterogeneous array items producing ambiguous schema definitions

When array elements have varying data types, the generator merges object shapes or produces union schemas with v.union(). Standardize array items or adjust optional field settings.

Frequently Asked Questions

What are the main advantages of Valibot compared to Zod or Yup?▼

Valibot uses a modular, function-oriented design where each validation method is a standalone function. Modern bundlers can tree-shake unused code, reducing client validator bundles from 15-50 KB down to under 1 KB.

How do I infer static TypeScript types from the generated Valibot schema?▼

Use v.InferOutput<typeof RootSchema> for output types (after transformations) or v.InferInput<typeof RootSchema> for raw input data. For example: export type Root = v.InferOutput<typeof RootSchema>;.

Is my JSON payload sent to any server for processing?▼

No. The conversion executes entirely in your browser using local Abstract Syntax Tree (AST) tokenization and parsing. Zero server uploads occur, ensuring total privacy.

How does the generator handle deeply nested JSON structures and arrays?▼

The generator recursively traverses nested JSON objects into nested v.object() schemas and arrays into v.array() schemas, preserving precise nesting levels and property types.

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