Schema validation

12-month change compares the average of the last 4 weeks of downloads with the first 4 weeks of the 52-week series. Gzip size is for the whole package, as measured by Bundlephobia. "-" means the value has not been fetched.

• @shexjs/termShape Expressions triple expression evaluator - simple regexp returning 1 error.
• graphile-exportExport in-memory generated GraphQL schemas to JS files when built with our helpers.
• validate-rfcA simple library to validate Mexican RFCs (Tax IDs)
• ip-validatorSuper simple IP Address validator for ipv4 & ipv6
• jschemeA small and simple object schema library for the browser and node
• ascertain0-Deps, simple, fast, for browser and node js object schema validator
• dhl-packstation-validatorA package for validating DHL Packstation addresses
• joi-assertAssert values using Joi schemas
• vuelidate-error-extractorHelps showing vuelidate error messages from translation files.
• @effected/package-jsonpackage.json parsing, editing, validation and file IO as Effect schemas.
• @shexjs/utilShape Expressions validation and utilities.
• barcoderGTIN validation made simple
• koas-parametersKoas parameters attempts to coerce path and query parameters to the type specified in their respective JSON schema.
• @objectstack/specObjectStack Protocol & Specification - TypeScript Interfaces, JSON Schemas, and Convention Configurations
• @openuidev/svelte-langDefine component libraries, generate LLM system prompts, and render streaming OpenUI Lang output in Svelte 5 — the Svelte runtime for OpenUI generative UI
• validate-npm-package-name-cliCLI for npmjs.com/validate-npm-package-name - give me a string and I'll tell you if it's a valid npm package name
• prisma-joi-generatorPrisma +2 generator to emit Joi schemas from your Prisma schema
• mongoose-id-validatorMongoose plugin to validate that ObjectID references refer to objects that actually exist in the referenced collection
• @gqloom/zodCreate GraphQL schema and resolvers easily using using Zod!
• validate-scopeChecks whether a subset is contained in a list of scopes. Uses code generation
• @optique/configConfiguration file support for Optique with Standard Schema validation
• schema2typeboxCreates typebox code from JSON schemas
• validation-utilsValidation utilities
• valibot-envtype-safe environment variables with valibot
• koa-zod-routerInspired by koa-joi-router, this package aims to provide a similar feature-set while leveraging Zod and Typescript to create typesafe routes and middlewares with built in I/O validation.
• @buildwithlayer/json-schema-zod-schemaA Zod Schema for JSON Schemas
• @amqp-contract/clientClient utilities for publishing messages using amqp-contract
• @directededges/specs-schemaSpecs UI Component Schema - TypeScript types and JSON schema definitions for component specifications
• @typeschema/mainUniversal adapter for schema validation
• next-safe-navigationType-safe navigation for NextJS App router with Standard Schema support (Zod, Valibot, ArkType, etc.)
• nhs-numbersValidate NHS numbers in various guises
• validate.io-typed-array-likeValidates if a value is typed-array-like.
• @hypequery/serveCode-first TypeScript runtime for validated ClickHouse analytics APIs, OpenAPI, auth, and tenancy
• @jarenjs/contractOperation contracts for the Jaren suite: the jaren-contract document declares JSON-in/JSON-out operations with kind, policy and an HTTP binding, compiled once into per-operation validators, transport normalizers and a static-beats-variable path matcher, s
• zod-v4-mocksMock generator for zod v4
• stitchkitContract-first backend framework — one defineContract() into an HTTP API, MCP tools, AI-agent tools and a typed client. Bun and Node.
• @varlock/astro-integrationAstro integration to use varlock for .env file loading - adds validation, type-safety, and extra security features
• bcp47-validateSimple validator for BCP47 locale tags
• validate.io-positive-primitiveValidates if a value is a positive number primitive.
• next-validations<!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
• @amqp-contract/workerWorker utilities for consuming messages using amqp-contract
• cypress-schema-validatorLightweight Cypress plugin for API schema validation. It leverages both the AJV validator (for plain JSON schemas, Swagger documents, and OpenAPI schemas) and the Zod validator (for Zod schemas).
• siretA simple validation module for french SIRET and SIREN numbers
• joi-jsonBuilds Joi schemas from JSON objects
• swagger-object-validatorValidate your objects against a swagger spec and receive in-depth error traces
• @fdograph/rut-utilitiesFully typed set of utility functions to parse, validate and generate a Chilean R.U.T. Set de funciones utilitarias para generar, procesar y validar un R.U.T. Chileno completamente tipado.
• validate.io-nonnegativeValidates if a value is a nonnegative number.
• @ethanresnick/json-schema-to-typescriptcompile json schema to typescript typings
• pixellintValidator for pixels, postbacks, conversion API payloads, and tracking URLs: Meta CAPI, Facebook pixel, GTM, and vendor rulepacks
• validataType safe data validation and sanitization

• valibot vs zod
• @asteasolutions/zod-to-openapi vs zod-openapi
• @hey-api/openapi-ts vs zod-openapi
• @hey-api/openapi-ts vs @asteasolutions/zod-to-openapi
• convict vs envalid
• type-graphql vs quicktype-core
• io-ts vs runtypes
• json-schema-to-typescript vs ts-json-schema-generator
• valibot vs superstruct
• @standard-schema/spec vs json-schema-to-ts
• @standard-schema/spec vs runtypes
• typebox vs ts-json-schema-generator
• @standard-schema/spec vs io-ts
• superstruct vs express-validator
• @apidevtools/swagger-parser vs @zodios/core
• json-schema-to-ts vs runtypes
• effect vs json-schema-to-ts
• graphql-scalars vs graphql-query-complexity
• joi vs v8n
• json-schema-to-ts vs io-ts