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Peppy string interpolation library with value filters such as 'pluralize' & 'articlize'.


Build Status

A peppy string interpolation library with filters for inflection, articlization, titleization & more.

npm i pep -SE

var pep = require('pep');
pep('Hello, {:subject|pluralize|titleize}!', { subject: 'world' });
// => (string) "Hello, Worlds!" 

Or, alternatively, mess with the String#prototype:

var pep = require('pep');
String.prototype.format = function(mappings) {
  return pep(this, mappings);
'Hello, {:subject}!'.format({
  subject: 'world'
// => (string) "Hello, world!" 


The easiest way is to grab it from NPM (use browserify if you're on a Browser):

$ npm i pep
# Then require it as usual
node> var pep = require('pep')

If you really want to suffer with old and terrible module/no-module formats, you can run make bundle yourself:

$ git clone git://
$ cd pep
$ npm install
$ make bundle
# And incldue `dist/pep.umd.js` on your AMD/script tag/whatever.


format(string, mappings)

Performs string interpolation, given a template string as basis, and a substitution map.

template-value: string | (string -> string)
format: string, { string -> template-value } -> string

If a mapping is not given, we assume it to be an empty object, in which case the template variables are just stripped away.

A template variable is a special construct in the form:

<template-variable> ::= "{:" (any but "}") "}"

For example, to provide a "Hello, world!" template, that adjusts to a given name, one could write:

format("Hello, {:subject}!", { subject: "world" })
// => "Hello, world!" 

A template variable can be escaped by placing a backslash between the open-curly braces and the colon, such that the construct would be output verbatim:

format("Hello, {\\:subject}!", { subject: "world" })
// => "Hello, {:subject}!" 

Platform support

ES3 and beyond!

browser support


For Node, just:

$ npm test

For the browser:

$ npm install -g brofist-browser
$ make test
$ brofist-browser serve test/specs
# Then point your browsers to the URL on yer console.


MIT/X11. Just do whatever you want to.

$ less LICENCE