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Developer ToolsAlternative to ZodAlternative to AjvAlternative to Yup

Joi

The most powerful data validation library for JavaScript and enterprise backend APIs.

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LicenseBSD-3-Clause
GitHub stars20.5k
Last commit1 weeks ago
Tags5 topics
Joi SchemaApi Data ValidationDeveloper ToolsHapi Joi ValidatorJavascript Schema Builder
Overview

Why consider Joi?

Joi is an open-source schema description language and data validator for JavaScript written by the hapijs team. Joi allows developers to define blueprints for complex JSON payloads, validating API request parameters, headers, and database models with detailed descriptive error messages.

Guided learning

Learn Joi by building

Practical setup notes, real use cases, and copy-ready examples in one focused guide.

1 min read 2 sections
In this guide2 sections

Overview of Joi

Joi enforces strict input validation boundaries across microservices and REST endpoints.

Quickstart

bash
1npm install joi
javascript
1import Joi from 'joi';
2const schema = Joi.object({ username: Joi.string().alphanum().min(3).max(30).required() });
3const { error, value } = schema.validate({ username: 'johndoe' });

Joi is licensed under the BSD 3-Clause License.

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Joi FAQs

Joi is listed as a Developer Tools tool on TiloBox. Review the overview, features, and official documentation on this page to decide whether it solves your specific workflow.

Start with the project's GitHub repository and official website for supported installation and deployment instructions. Test the setup with representative data or a small project before rolling it out more widely.

Joi is listed under the BSD-3-Clause license. Read the complete license text and the project's notices before using, modifying, or distributing the software.

Production readiness depends on your requirements. Review maintenance activity, security practices, documentation, backup and upgrade procedures, and compatibility with your stack; then validate it in a non-production environment.

Joi is listed as an alternative to Zod. Compare the core workflow, deployment model, integrations, and licensing against your must-have requirements before switching.