Is there a sprintf equivalent for node.js

Question

Looking to do output formatting (sprintf type functionality) in node.js, but before I write it myself I was wondering if there's something similar built-in (I've trawled the docs to no avail) or if someone's already written a module.

Many thanks

I have since released a fast and spec compliant printf implementation for Node.js and browser github.com/gajus/fast-printf — Gajus
– Gajus, Commented Jan 3, 2021 at 2:53

congusbongus · Accepted Answer · 2017-04-06 01:01:50Z

84

There is now printf-like support in util.format().

Example:

util.format('hello %s', 'world'); // Returns: 'hello world'

edited Apr 6, 2017 at 1:01

congusbongus

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answered Dec 2, 2011 at 10:58

lapo

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8 Comments

lapo Over a year ago

Also, the support in util.format is very very basic: no %5d or %5.3f or anything like that, so it's not a real sprintf-like solution, unfortunately.

Ian Oxley Over a year ago

Similar to @Elliot Foster's comment, you could also do var printf = require('util').format;

Etienne Over a year ago

@lapo floating point number can be rounded using toFixed() var a = 1.234567;a.toFixed(3) => >'1.235'

Pavel P Over a year ago

it's useless, it's not printf-like at all

collapsar Over a year ago

Coercing numbers into fixed width string representations, possibly with 0-padding, is a staple use case for printf-alikes; util.format does not support that (eg require('util').format("blarf_%04d", 42);) as of v 10.5.0.

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Gajus · Accepted Answer · 2021-01-03 02:54:01Z

28

There are couple in the npm registry which are actual sprintf implementations since util.format has just a very basic support.

edited Jan 3, 2021 at 2:54

Gajus

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answered Aug 16, 2011 at 13:20

KARASZI István

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1 Comment

scavenger Over a year ago

unfortunately sprintf-js is incompatible with colors: sprintf(" %s %s", title.grey, colors['blue'](msg)) ' \x1B[90mTitle\x1B[39m \x1B[34mMessage\x1B[39m'

Sarfraz · Accepted Answer · 2010-04-23 10:52:33Z

7

Here is the javascript version of sprintf:

http://phpjs.org/functions/sprintf:522

answered Apr 23, 2010 at 10:52

Sarfraz

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Comments

Jürgen Paul · Accepted Answer · 2013-06-29 13:43:08Z

5

console.log works fine.

console.log('%d hours', 4); // 4 hours console.log('The %2$s contains %1$d monkeys', 4, 'tree'); // The tree contains 4 monkeys

answered Jun 29, 2013 at 13:43

Jürgen Paul

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4 Comments

FGM Over a year ago

The first example works on Node 0.10.18, but the second completely fails: the 2$/1$ need to be removed to actually get parameter interpolation, and then the parameters need to be in correct order, otherwise you get: console.log('The %s contains %d monkeys', 4, 'tree'); returns: The 4 contains NaN monkeys ```

joemaller Over a year ago

The second example works in Chrome's (v33) console. Per @FGM, console.log('The %s contains %d monkeys', 'tree', 4); works in node v0.10.26.

Alnitak Over a year ago

useful tip (if it works) but it's equivalent to printf, not sprintf.

Ray Foss Over a year ago

not sure why it doesn't work on node v9.4, just use `es6 template ${format}`

ßiansor Å. Ålmerol · Accepted Answer · 2021-06-18 18:24:03Z

Use locutus

As of now, there is a package that translate functions of other languages to Javascript such as php, python, ruby etc.

const sprintf = require("locutus/php/strings/sprintf") const data = sprintf("%01.3f", 2); console.log(data) //output: 2.000

Try it here codesandbox

Mike Pawlowski · Accepted Answer · 2023-06-09 20:32:48Z

Native Node.js Solution: `util.format(format[, ...args])`

Expansion of https://stackoverflow.com/a/8355266/5795299

Example

Here is a more robust example demonstrating how to parameterize a literal String

import { format } from "util"; const rawURL = "mongodb+srv://%s:%[email protected]"; const username = "zappbrannigan"; const password = "VMJta9hdDGymmYMz"; const url = format(rawURL, username, password); console.log(url); // Output: "mongodb+srv://zappbrannigan:[email protected]"

References

See: https://nodejs.org/docs/latest-v18.x/api/util.html#utilformatformat-args

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