lutangar / ethtools

Formatting and value conversion for ethereum currencies.

Ethereum tools

Formatting and value conversion for ethereum currencies.

This package is an alternative of https://github.com/ethereum/meteor-package-tools for node and the browser. The API is therefore as close as possible.

Installation

$ npm install --save ethtools

Usage

formatBalance (or formatWei)

Format a number of wei to another ether unit.

• number : (String|Number|BN) - the number of wei to format
• format : (String) - the format see numeral.js for more examples (0,0.[00000000] $ by default)
• unit : (String) - any ethereum units see ethjs-unit supported units (ether by default)
• options : (Object) - a list of options. Currently supported options are:
  • etherSymbol : (String) - if unit is ether will use this symbol for the unit instead (Ξ by default)
  • locale : (String) - a custom locale (en by default)

import { formatBalance } from 'ethtools';

formatBalance('1000000000000000000');
// => 1.0 Ξ

formatNumber

Format a number using numeral.js formats.

this function is used internally by formatBalance

• number (String|Number|BN) - the number to format
• format (String) - the format see numeral.js for more examples

Number	Format	String
1000.234	$0,0.00	Ξ1,000.23
1000.2	0,0[.]00 $	1,000.20 Ξ
1001	$ 0,0[.]00	Ξ 1,001
-1000.234	($0,0)	(Ξ1,000)
-1000.234	$0.00	-Ξ1000.23
1230974	($ 0.00 a)	Ξ 1.23 m

• unit (String) - any custom unit/currencies, will replace the $ sign
• options : (Object) - a list of options. Currently supported options are:
  • etherSymbol : (String) - if unit is ether will use this symbol for the unit instead (Ξ by default)
  • locale : (String) - a custom locale (en by default)

Example

import { formatNumber } from 'ethtools';

formatNumber('1000000000000000000', '0,0.0[00]');
// => 1,000,000,000,000,000,000.0

toWei

A proxy method to toWei method of ethjs-unit

fetchPrices

Promise-based helper to fetch current ether price information via cryptocompare.com public API

Example

import { fetchPrices } from 'ethtools';

fetchPrices().then(({response, json }) => console.log(json));
// { BTC: 0.07353, USD: 297.5, EUR: 250.78 }

Tests

Simply clone the repo, npm install, and run npm test.

Links

• https://github.com/ethjs/ethjs-unit
• http://numeraljs.com
• https://github.com/indutny/bn.js