How do access NODE_ENV in Nunjucks template?

Question

I have some Nunjucks template blocks that I want to render only in certain environments. I can't seem to access the NODE_ENV variable though. I tried this:

{% if process.env.NODE_ENV === 'development' %}
  <div>rendering some stuff here</div>
{% endif %}

This didn't seem to work for me though. It didn't seem to have any idea what process.env.NODE_ENV was.

Is it possible to access an environment variable like this in a template?

Answer 1

You can use one of these variants:

1. Use addGlobal to define function which returns environment

    var nunjucks = require('nunjucks'); var env = nunjucks.configure(); env.addGlobal('$environment', () => process.env.NODE_ENV || 'development'); var res = nunjucks.renderString(`{{$environment()}}`); console.log(res); 

2. Define $environment as global .

3. Set res.locals.environment in middleware

    const app = express(); app.use(function (req, res, next) { res.locals.$environment = process.env.NODE_ENV || 'development'; next(); }); // In nunjucks template {{$environment}} 

Answer 2

I ended up doing the following in my app.js

nunjucks.configure('views', {
  ...
}).addGlobal('NODE_ENV', process.env.NODE_ENV)

This simply adds NODE_ENV as a globally accessible variable in my Nunjucks template.