What is the proper way to check for existence of variable in an EJS template (using ExpressJS)?

What is the proper way to check for existence of variable in an EJS template (using ExpressJS)?

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express

Render a variable as HTML in EJS

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express

Error: Cannot find module 'ejs'

node.js express ejs

express

How to create global variables accessible in all views using Express / Node.JS?

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express

Express and ejs <%= to render a JSON

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express

How can I include css files using node, express, and ejs?

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express

adding .css file to ejs

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express

Inside Express/EJS templates, what is cleanest way to loop through an array?

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express

How to print a variable directly using EJS template engine?

node.js express ejs

express

What is the layout `yield` method in ejs?

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express

Displaying an image with EJS in node.js/express

node.js express ejs

express

How to use node modules (like MomentJS) in EJS views?

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express

Nodejs EJS helper functions?

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express

Pass variables to JavaScript in ExpressJS

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express

Accessing EJS variable in Javascript logic

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express