process.env.NODE_ENV仍在开发中，但仍显示出意外的行为

Question

I'm running my node server in development environment but in my server file it shows unexpected behaviour

my script is as fallows:

var env = process.env.NODE_ENV;
console.log("------------------------------");
console.log("envenv",typeof env,env);
console.log("0",typeof env);
console.log("00",env);
console.log("2",env.toString()=='development');
console.log("3",""+env.toString()=='production');
console.log("2",env==='development');
console.log("3",env=="production");
console.log("------------------------------");

but it gives following output

------------------------------
envenv string 'development'
0 string
00 'development'
2 false
3 false
2 false
3 false
------------------------------

When I tried any of following it worked fine

var env = process.env.NODE_ENV.trim(); 
var env = process.env.NODE_ENV.toLowerCase();
var env = process.env.NODE_ENV.replace("","");

.............

or any method other then toString() which are in prototype of String class It worked fine

Answer 1

The environment variable NODE_ENV contains superfluous ' . Something went wrong when setting the environment variable. For windows system use

> SET NODE_ENV=development

instead of

> SET NODE_ENV='development'

That should fix the issue.

To get the current value of NODE_ENV printed on the command line use

> echo %NODE_ENV%

That should print

> development

Without any " or '

Answer 2

How do you set the NODE_ENV ? I'm working on windows and I've just spent some time fighting the same problem and discovered that it was because my npm script looked like SET NODE_ENV=production && do everything else so NODE_ENV was actually containing the whitespace as the last character which for some reason wasn't displayed in a console (I've done kind of the same set of tests as yours, but I also checked lengths of my strings and discovered that NODE_ENV is one symbol wider than it should be). Changing my script to SET NODE_ENV=production&& do everything else solved the issue.

Answer 3

console.log("00",env);

this should print 00 development instead of 00 'development'

You should set your env again.