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?

Where is your environment variable set and how? Maybe in your case it could be undefined, then you should set it to an default value. take a look at this: https://github.com/JohnnyDevNull/express-api-typescript-template/blob/master/src/server.ts and this: https://github.com/JohnnyDevNull/express-api-typescript-template/blob/master/package.json where i set my env variables — JohnnyDevNull, Sep 12 '18 at 05:17

score 4 · Accepted Answer · answered Sep 13 '18 at 04:46

4

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.

answered Sep 13 '18 at 04:46

Jake Wilson

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score 1 · Answer 2 · answered Sep 12 '18 at 12:18

You can use one of these variants:

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);

Define $environment as global.

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}}

How do access NODE_ENV in Nunjucks template?

2 Answers2