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express-validator/express-validator

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Express Validator

express-validator is a server-side input validation library designed specifically for Express.js applications. It provides middleware that validates and sanitizes incoming HTTP request data against developer-defined rules, collecting all validation failures into a single array for simultaneous error reporting rather than failing on the first error.

The library offers a chainable validation API where rules are built by chaining methods on a validation chain object, enabling declarative specification of multiple validators and sanitizers for a single request field. Each validation chain operates on a specific request field (such as body, query, or params), maintaining a context that tracks the field name, location, and validation state throughout execution. Validation rules can also be defined declaratively using a schema object that maps field names to validation and sanitization configurations, separating rule definition from application logic.

The library wraps and exposes the validator.js library's validation and sanitization functions as chainable methods, providing a consistent interface for common validation operations. Validation rules are defined as Express middleware functions that compose with other middleware in the request handling pipeline, allowing validation to be integrated directly into route definitions. The library also provides sanitization middleware that cleans and transforms request field values by applying sanitization functions before route handlers execute.

Features

  • Input Validation Libraries - A dedicated server-side library for defining validation chains on request fields with structured error objects.
  • Request Validation - Validates incoming HTTP request fields against developer-defined rules with structured error reporting.
  • Request Parameter Sanitization - Provides middleware that sanitizes incoming request field values by applying validator.js sanitization functions.
  • Request Validation - Validates incoming HTTP request fields against developer-defined rules in an Express.js application.
6,238 stars·628 forks·TypeScript·MIT·25 views
Chain Builders - Provides a chainable API for building reusable validation and sanitization rules for Express.js routes.
  • Input Sanitization Rules - Cleans and transforms request field values by applying sanitization functions to remove or replace unwanted content.
  • Request Validation Middleware - Integrates validation logic as Express.js middleware to check request data before route handlers execute.
  • Sanitization Middleware - Ships middleware that sanitizes request field values by applying transformation functions before route handlers run.
  • Schema-Driven Validations - Validation rules are defined declaratively using a schema object mapping field names to validation and sanitization configurations.
  • Error Accumulators - Collects all validation errors into an array during request processing for simultaneous reporting.
  • Error Accumulation Middleware - Middleware that collects all validation errors into an array during request processing for simultaneous reporting.
  • Validation Error Reporters - Reports which request fields passed or failed validation rules with structured error messages for API responses.
  • Composable Middleware Pipelines - Validation rules are defined as Express middleware functions that compose with other middleware in the request pipeline.
  • Chain-Based Validation Pipelines - Ships a chainable API where validation rules are built by chaining methods on a validation chain object.
  • Chainable Validation APIs - Provides a chainable API where validators and sanitizers are composed by chaining methods on a validation object.
  • Validation Schemas - Validation rules can be defined declaratively using a schema object mapping field names to validation configurations.
  • Star history

    Star history chart for express-validator/express-validatorStar history chart for express-validator/express-validator

    How this analysis was created: This summary and feature list are AI-generated from collected project material and can contain mistakes. Stars, license and language are imported from GitHub. Inclusion does not mean that we have tested or audited this project. Check the source documentation for any feature you depend on. Learn more on our About page.

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    Frequently asked questions

    What does express-validator/express-validator do?

    express-validator is a server-side input validation library designed specifically for Express.js applications. It provides middleware that validates and sanitizes incoming HTTP request data against developer-defined rules, collecting all validation failures into a single array for simultaneous error reporting rather than failing on the first error.

    What are the main features of express-validator/express-validator?

    The main features of express-validator/express-validator are: Input Validation Libraries, Request Validation, Request Parameter Sanitization, Chain Builders, Input Sanitization Rules, Request Validation Middleware, Sanitization Middleware, Schema-Driven Validations.

    Which projects share features with express-validator/express-validator?

    Projects with overlapping indexed features include: elysiajs/elysia — Elysia is a high-performance TypeScript web framework designed for building type-safe backend services. It provides a… spec-first/connexion — Connexion is a spec-first Python web framework designed to derive server behavior and validation logic directly from a… operator-framework/operator-sdk — The Operator SDK is a framework for building, packaging, and managing custom controllers that extend the Kubernetes… fastify/fastify — This project is a high-performance web framework designed for building scalable server-side applications with minimal… zhanymkanov/fastapi-best-practices — This project provides a comprehensive guide to architectural patterns and best practices for building scalable,… h3js/h3 — Hono is a minimal JavaScript HTTP framework designed for building web servers across multiple runtimes, including…