Convert sample JSON data structures into Joi validation schemas with Joi.object(), Joi.string(), Joi.number(), and Joi.array() constraints.
import Joi from 'joi';
/**
* Joi Validation Schema: userProfileSchema
* Auto-generated by ToolsAA (100% Client-Side Engine)
*/
export const userProfileSchema = Joi.object({
id: Joi.string().uuid().required(),
username: Joi.string().required(),
email: Joi.string().email().required(),
role: Joi.string().required(),
isActive: Joi.boolean().required(),
age: Joi.number().integer().min(0).required(),
avatarUrl: Joi.string().uri().required(),
permissions: Joi.array().items(Joi.string().optional()).required(),
profile: Joi.object({
firstName: Joi.string().required(),
lastName: Joi.string().required(),
company: Joi.string().required(),
timezone: Joi.string().required(),
githubHandle: Joi.string().required(),
}).required(),
metadata: Joi.object({
lastLoginIp: Joi.string().ip().required(),
loginCount: Joi.number().integer().min(0).required(),
twoFactorEnabled: Joi.boolean().required(),
}).required(),
createdAt: Joi.date().iso().required(),
deactivatedAt: Joi.any().allow(null).required(),
}).required();
export type UserProfileSchemaType = typeof userProfileSchema;
Automatically detects UUIDs, email addresses, ISO timestamps, URIs, integers, positive numbers, and nested object arrays.
All JSON syntax tree traversal, validation rule deduction, and schema generation execute strictly within local browser memory.
Instantly exports modern ES Modules (TypeScript), CommonJS (Node.js), and drop-in Express request validation middlewares.
Convert sample JSON data structures into Joi validation schemas with Joi.object(), Joi.string(), Joi.number(), and Joi.array() constraints.
Inference strategy for marking properties with .required() or .optional() (all, none, root-only).
Automatically detect and attach semantic validators (.email(), .uri(), .guid(), .isoDate(), .ip()).
Enforces .unknown(false) on Joi.object() to reject undeclared payload properties.
JavaScript module export style ('esm', 'commonjs', or 'inline').
Append .unknown(false) to root and nested schemas in critical API handlers to reject unexpected client fields, preventing parameter pollution and mass-assignment security vulnerabilities.
Instantiate your Joi schemas at the module level rather than inside Express or Koa route handlers; reusing pre-compiled schema instances eliminates redundant allocation overhead during peak traffic.
Use Joi.array().items(...) with composite object definitions to guarantee that every list item conforms strictly to structural requirements rather than accepting arbitrary arrays.
When executing schema.validate(payload, { abortEarly: false }), Joi gathers all schema violations simultaneously instead of failing on the first error, giving API consumers complete feedback.
By default or when .unknown(false) is active, Joi rejects undeclared keys. Use .unknown(true) or pass { stripUnknown: true } in the validate options to silently remove unexpected properties.
Verify that sample date strings conform to ISO 8601 standards (e.g., '2026-10-17T03:30:00.000Z') and ensure detectFormats is enabled, which outputs Joi.string().isoDate().
Provide representative arrays with consistent item structures in your sample JSON, or wrap varied item schemas inside Joi.alternatives().try(...) for multi-type validation.
Joi is an established, feature-rich schema description and data validator widely used in Node.js, Express, NestJS, and hapi ecosystems. It excels at runtime data coercion, complex condition checks (.when()), and granular custom error transformations.
Export your compiled schema and pass request bodies through it: const { error, value } = schema.validate(req.body, { abortEarly: false }). If error is present, respond with status 400 and error.details; otherwise proceed with the sanitized value.
Yes. Execute schema.validate(req.body, { stripUnknown: true }) or chain .options({ stripUnknown: true }) directly onto the schema to automatically discard unvalidated fields.
No. The entire JSON parsing, AST tree traversal, type inference, and Joi code generation workflow runs 100% client-side in your local browser runtime.
Yes. The tool recursively traverses deeply nested JSON hierarchies, generating corresponding nested Joi.object({...}) and Joi.array().items(Joi.object({...})) validation structures.
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