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python-format is implementation of Python's str.format. It works both in browser and in Node.js. If you want to use this in Node.js, just use npm install python-format in console.

var format = require('python-format')
console.log(format('Hello, {}!', 'world'))

If you want to use this in browser, download python-format.js, and if you want, pass it using your favorite JavaScript minifizer (I prefer UglifyJS, but you can use other minifizers).

For more details, see



  • Grouping of digits now works properly with @johnbellessa's patches.


  • -0 is returned instead of 0 when dealing with format('{:g}', -0).


  • First release