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guide.
CHECK API · EXPRESS-VALIDATOR These methods are all available via `require('express-validator/check')`. WHOLE BODY VALIDATION · EXPRESS-VALIDATOR Sometimes you need to validate a request whose body is a string, an array, or even a number! CUSTOM VALIDATORS/SANITIZERS · EXPRESS-VALIDATOREXPRESS VALIDATOR OPTIONALEXPRESS VALIDATOR TYPESCRIPTNPM EXPRESS VALIDATOR Custom validators/sanitizers. Although express-validator offers plenty of handy validators and sanitizers through its underlying dependency validator.js, it doesn't always suffice when building your application. For these cases, you may consider writing a custom validator or a custom sanitizer. VALIDATIONRESULT() · EXPRESS-VALIDATOR These methods are all available via `require('express-validator')`. SANITIZATION · EXPRESS-VALIDATOR Sanitization. Sometimes, receiving input in a HTTP request isn't only about making sure that the data is in the right format, but also that it is free of noise. validator.js provides a handful of sanitizers that can be used to take care of the data that comes in. const express = require ( 'express' ); const { SANITIZATION MIDDLEWARES · EXPRESS-VALIDATORNPM EXPRESS VALIDATOREXPRESS VALIDATOR CUSTOMEXPRESS VALIDATOR OPTIONALEXPRESS VALIDATOR TYPESCRIPTPASSWORD VALIDATION EXPRESS APP Sanitization middlewares. These methods are all available via require ('express-validator'). These sanitization-only middlewares have been deprecated, as the validation middlewares offer the same functionality, and much more. They will be removed eventually. LEGACY API · EXPRESS-VALIDATOR Legacy API. The "legacy API" is the same API used by version 3 and older releases of express-validator. It's based around setting a global middleware in your express app and decorating the request object with new methods. This API MUST NOT be used by new apps, since it may not receive new updates and can even be removed in a futuremajor version.
WILDCARDS · EXPRESS-VALIDATOR Wildcards. Sometimes you will want to apply the same rules to all items of an array or all keys of some object. That's what the * character -- also known as a wildcard -- is for. For example, imagine you want to validate that all addresses have a valid postal code, and that the number of each address is sanitized as an integer. We can dothis
SANITIZATION CHAIN API · EXPRESS-VALIDATOR Sanitization Chain API. The sanitization chain is a middleware, and it should be passed to an Express route handler. You can add as many sanitizers to a chain as you need. When the middleware runs, it will modify each field in place, applying each of the sanitizers in the order they were specified: const { body } = require ('express-validator
GETTING STARTED · EXPRESS-VALIDATOR express-validator is a set of express.js middlewares that wraps validator.js validator and sanitizer functions.. Installation. Install it using npm (make sure that you have Node.js 8 or newer): npm install --save express-validator Basic guide. It's recommended that you have basic knowledge of the express.js module before you go on with thisguide.
CHECK API · EXPRESS-VALIDATOR These methods are all available via `require('express-validator/check')`. WHOLE BODY VALIDATION · EXPRESS-VALIDATOR Sometimes you need to validate a request whose body is a string, an array, or even a number! CUSTOM VALIDATORS/SANITIZERS · EXPRESS-VALIDATOREXPRESS VALIDATOR OPTIONALEXPRESS VALIDATOR TYPESCRIPTNPM EXPRESS VALIDATOR Custom validators/sanitizers. Although express-validator offers plenty of handy validators and sanitizers through its underlying dependency validator.js, it doesn't always suffice when building your application. For these cases, you may consider writing a custom validator or a custom sanitizer. VALIDATIONRESULT() · EXPRESS-VALIDATOR These methods are all available via `require('express-validator')`. SANITIZATION · EXPRESS-VALIDATOR Sanitization. Sometimes, receiving input in a HTTP request isn't only about making sure that the data is in the right format, but also that it is free of noise. validator.js provides a handful of sanitizers that can be used to take care of the data that comes in. const express = require ( 'express' ); const { SANITIZATION MIDDLEWARES · EXPRESS-VALIDATORNPM EXPRESS VALIDATOREXPRESS VALIDATOR CUSTOMEXPRESS VALIDATOR OPTIONALEXPRESS VALIDATOR TYPESCRIPTPASSWORD VALIDATION EXPRESS APP Sanitization middlewares. These methods are all available via require ('express-validator'). These sanitization-only middlewares have been deprecated, as the validation middlewares offer the same functionality, and much more. They will be removed eventually. LEGACY API · EXPRESS-VALIDATOR Legacy API. The "legacy API" is the same API used by version 3 and older releases of express-validator. It's based around setting a global middleware in your express app and decorating the request object with new methods. This API MUST NOT be used by new apps, since it may not receive new updates and can even be removed in a futuremajor version.
WILDCARDS · EXPRESS-VALIDATOR Wildcards. Sometimes you will want to apply the same rules to all items of an array or all keys of some object. That's what the * character -- also known as a wildcard -- is for. For example, imagine you want to validate that all addresses have a valid postal code, and that the number of each address is sanitized as an integer. We can dothis
SANITIZATION CHAIN API · EXPRESS-VALIDATOR Sanitization Chain API. The sanitization chain is a middleware, and it should be passed to an Express route handler. You can add as many sanitizers to a chain as you need. When the middleware runs, it will modify each field in place, applying each of the sanitizers in the order they were specified: const { body } = require ('express-validator
GETTING STARTED · EXPRESS-VALIDATOR express-validator is a set of express.js middlewares that wraps validator.js validator and sanitizer functions.. Installation. Install it using npm (make sure that you have Node.js 6 or newer): npm install --save express-validator Basic guide. It's recommended that you have basic knowledge of the express.js module before you go on with thisguide.
EXPRESS-VALIDATOR · EXPRESS-VALIDATOR DOCS express-validator docs. Latest version. Here you can find the latest documentation and unreleased code. CUSTOM VALIDATORS/SANITIZERS · EXPRESS-VALIDATOR Custom validators/sanitizers. Although express-validator offers plenty of handy validators and sanitizers through its underlying dependency validator.js, it doesn't always suffices when building your application. For these cases, you may consider writing a custom validator or a custom sanitizer. VALIDATION CHAIN API · EXPRESS-VALIDATOR The validation chain is a middleware, and it should be passed to an Express route handler.. You can add as many validators and sanitizers to a chain as you need. When the middleware runs, it will run each validator or sanitizer in the order they were specified; this means if a sanitizer is specified before a validator, the validator will run with the sanitized value. SCHEMA VALIDATION · EXPRESS-VALIDATOR Schemas are a special, object-based way of defining validations or sanitizations on requests. VALIDATION CHAIN API · EXPRESS-VALIDATOR Any of the validation and sanitization methods listed by validator.js are made available in all validation chains created by express-validator, as long as we're supporting the most up-to-date validator version. If you use any of the sanitizers together with validators, the validated value is the sanitized one. MATCHEDDATA() · EXPRESS-VALIDATOR matchedData (req ) req: the express request object. includeOptionals: if set to true, the returned value includes optional data. Defaults to false. onlyValidData: if set to false, the returned value includes data from fields that didn't pass their validations. Defaults to true. locations: an array of locations to extract the datafrom.
SANITIZATION CHAIN API · EXPRESS-VALIDATOR Sanitization Chain API. The sanitization chain is a middleware, and it should be passed to an Express route handler. You can add as many sanitizers to a chain as you need. When the middleware runs, it will modify each field in place, applying each of the sanitizers in the order they were specified: const { body } = require ('express-validator
WILDCARDS · EXPRESS-VALIDATOR Wildcards. Sometimes you will want to apply the same rules to all items of an array or all keys of some object. That's what the * character -- also known as a wildcard -- is for. For example, imagine you want to validate that all addresses have a valid postal code, and that the number of each address is sanitized as an integer. We can dothis
SANITIZATION CHAIN API · EXPRESS-VALIDATOR Sanitization Chain API. The sanitization chain is a middleware, and it should be passed to an Express route handler. Any of the sanitization methods listed by validator.js are made available in all sanitization chains created by express-validator, as long as we're supporting the most up-to-date validator version.EXPRESS-VALIDATOR
6.2.0
* Docs
* API
* GitHub
_›_INTRODUCTION
__
INTRODUCTION
* Getting Started
FEATURES
* Sanitization
* Custom validators/sanitizers * Custom Error Messages* Wildcards
* Schema Validation
* Whole Body Validation * Running validations imperativelyAPI
* Validation middlewares * Validation Chain API * Sanitization middlewares * Sanitization Chain API* matchedData()
* validationResult()Edit
GETTING STARTED
express-validator is a set of express.js middlewares that wraps validator.js validator and sanitizerfunctions.
INSTALLATION
Install it using npm (make sure that you have Node.js 6 or newer): npm install --save express-validatorBASIC GUIDE
> It's recommended that you have basic knowledge of the express.js > module before you go on with this guide. Let's get started by writing a basic route to create a user in thedatabase:
const express = require('express'); const app = express(); app.use(express.json()); app.post('/user', (req, res) => {User.create({
username: req.body.username, password: req.body.password }).then(user => res.json(user));});
Then, you'll want to make sure that you validate the input and report any errors before creating the user: // ...rest of the initial code omitted for simplicity. const { check, validationResult } = require('express-validator'); app.post('/user', , (req, res) => { // Finds the validation errors in this request and wraps them in an object with handy functions const errors = validationResult(req); if (!errors.isEmpty()) { return res.status(422).json({ errors: errors.array() });}
User.create({
username: req.body.username, password: req.body.password }).then(user => res.json(user));});
_Voila!_ Now, whenever a request that includes invalid username or password fields is submitted, your server will respond like this:{
"errors":
}
For all the available validators in express-validator (just like its options), take a look at validator.js docs here.
WHAT'S NEXT
This completes the basic guide on getting started withexpress-validator.
You might want to continue reading about some of the more advancedfeatures available:
* Sanitization
* Custom validators/sanitizers * Custom error messages* Wildcards
* Schema validation
Sanitization →
* Installation
* Basic guide
* What's next
DOCS
Getting Started API ReferenceCOMMUNITY
Stack Overflow
MORE
GitHub
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2019 express-validatorDetails
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