Handling Form Data in Express.js

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Validation vs Sanitization vs Output Escaping: What’s the Difference?

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Types of Form Validation

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What Is Client-Side Form Validation?

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What Is Server-Side Form Validation?

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How to Use Express-Validator to Validate a Form’s Data

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Create a new project directory

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Create a package.json file

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Configure the project as an ES module application

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Install the required packages

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Configure a web server to respond to browser requests

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Create the routes

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Create the controllers

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body()

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validationResult()

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Create the views

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views/index.ejs

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views/infoForm.ejs

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Run your Express.js application

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Important Things to Know About Validation, Sanitization, and Output Escaping in Express

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Why use the escaped output tag (<%=)?

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EJS’s HTML escaping is effective for normal HTML output

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Avoid escaping user-supplied data permanently

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POST vs GET Method Attributes in HTML Forms

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Usage

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Data visibility

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Data size

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Bookmarkable query

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Shareable query

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Repeated requests

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