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express-validator Documentation

website·Indexed 30 days ago

https://express-validator.github.io/docs/

A set of express.js middlewares for validating and sanitizing HTTP requests. Features include validation chains, schema-based validation via checkSchema(), custom validators, and tools for handling validation results with validationResult(). Supports versions 6.x.x, 7.x.x, and provides migration guides between major versions.

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What's inside express-validator

  1. Overview of express-validator

    express-validator is a collection of express.js middlewares that wrap the validators and sanitizers provided by validator.js. It allows developers to validate and sanitize express requests and provides tools to determine request validity and identify which data matched specific validators.

  2. Overview of express-validator

    express-validator is a collection of express.js middlewares that wrap the validators and sanitizers provided by validator.js. It allows developers to validate and sanitize incoming express requests and provides tools to determine request validity and identify matched data.

  3. Overview of express-validator

    express-validator is a set of express.js middlewares that wrap the validators and sanitizers from validator.js. It provides tools to validate and sanitize express requests and determine if a request is valid based on defined validators.

  4. Overview of express-validator

    express-validator is a collection of express.js middlewares that wrap the validators and sanitizers provided by validator.js. It allows developers to validate and sanitize express requests and provides tools to determine request validity and identify which data matched specific validators.

  5. Understand express-validator chain behavior and validator.js integration

    All validation and sanitization methods from validator.js are available in express-validator chains.

    Key behaviors:

    • Sanitization Order: If sanitizers are used before validators, the validator operates on the sanitized value.
    • Mutability: Validation chains are mutable. Calling a method adds behavior to the existing chain. To reuse a base chain, use a factory function to avoid unintended side effects.

  6. Understand the express-validator Validation Chain behavior

    The validation chain is middleware passed to Express route handlers. Validators and sanitizers run in the order they are specified; if a sanitizer precedes a validator, the validator operates on the sanitized value. Note that chains are mutable; calling a method adds behavior to the existing chain. To reuse a base chain, use a factory function.

  7. Understand the express-validator Validation Chain

    The validation chain is a middleware passed to an Express route handler. Validators and sanitizers are executed in the order they are specified. If a sanitizer is placed before a validator, the validator will operate on the sanitized value. Note that chains are mutable; calling methods adds behavior to the same chain instance. To reuse a base chain, use a factory function.

  8. Understand the express-validator Validation Chain

    The validation chain is middleware passed to Express route handlers. Validators and sanitizers run in the order they are specified; if a sanitizer precedes a validator, the validator operates on the sanitized value. Note that chains are mutable; calling a method adds behavior to the existing chain. Use a factory function when reusing a base chain.

  9. Understand the architecture of express-validator

    express-validator is implemented as a series of middleware functions for Express.js. These middlewares intercept incoming HTTP requests (req and res objects) to verify if request fields adhere to a declared specification. When a field is found to be invalid, the error is recorded internally, allowing the developer to later forward these validation errors back to the user. The library uses a declarative programming style, where validators and sanitizers are defined as middleware in the request pipeline.

  10. Use validator.js methods in express-validator chains

    All validation and sanitization methods provided by the validator.js library are available within express-validator chains. Note that if sanitizers are used before validators, the validator operates on the sanitized value.

    Important: Validation chains are mutable. Calling a method adds behavior to the existing chain. To reuse a base chain, use a factory function to avoid side effects across different requests.

  11. Understand express-validator Validation Chain behavior

    The validation chain acts as middleware for Express route handlers. Validators and sanitizers are executed sequentially in the order they are defined; if a sanitizer precedes a validator, the validator operates on the sanitized value. Note that chains are mutable; calling a method modifies the existing chain. To reuse a base chain, use a factory function.

  12. Understand the express-validator Validation Chain

    The validation chain is a middleware passed to Express route handlers. It executes validators and sanitizers sequentially in the order they are defined. If a sanitizer is placed before a validator, the validator will operate on the sanitized value. Note that chains are mutable; calling a method adds behavior to the existing chain. To reuse a base chain, it is recommended to use a factory function.