Get width of terminal in Node.js

Question

console.log(process.env.COLUMNS)

Yields undefined, although,

$ echo $COLUMNS

Outputs as expected:

I have been trying running Node like this env node myprog.js, still undefined. What's wrong with me or any other way to know the width of terminal? (For nice formatting of some output data).

When I tried console.log(process.env) outputs the same as printenv and for some reason $COLUMNS is not on printenvoutput. — Paulo Oliveira
– Paulo Oliveira, Commented May 19, 2015 at 20:44

r0- · Accepted Answer · 2015-05-19 20:41:20Z

118

console.log('Terminal size: ' + process.stdout.columns + 'x' + process.stdout.rows);

And the output looks like e.g. "Terminal size: 80x24". There is also an event if the console size changes.

It's explained under tty in the docs.

answered May 19, 2015 at 20:41

r0-

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6 Comments

Slava Fomin II Over a year ago

I believe, it should be used as (process.stdout.columns || defaultColumns) because the stdout.columns could be undefined.

Zei Over a year ago

"-".repeat(process.stdout.columns) to create a line across the terminal.

Coty Embry Over a year ago

"-".repeat(process.stdout.columns - 2) to account for the beginning ' and ending ' characters ^_^

Gerben Rampaart Over a year ago

Please NOTE @SlavaFominII's remark ! I have had code fail in production because process.stdout.columns was undefined in a container.

Slava Fomin II Over a year ago

@user3932000 no, you can set it as you wish

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