String.ify
A small, simple yet powerful JavaScript object stringifier / pretty-printer. Powers the Ololog
library.
Why
- Humanized output
- Highly configurable
- Pluggable rendering (via Symbols)
- Works in Node and browsers
Recent changes
RegExp
instances now rendered correctly- Chain-style configuration helpers:
stringify.pure.noPretty.maxDepth (10) (...)
- Now understands typed arrays
Installing
npm install string.ify
In your code:
stringify = require ('string.ify')
Pretty Printing
stringify ({ obj: [{ someLongPropertyName: 1, propertyName: 2, anotherProp: 4, moreProps: 5 },
{ propertyName: { someVeryLongPropertyName: true, qux: 6, zap: "lol" } }] })
Will output:
{ obj: [ { someLongPropertyName: 1,
propertyName: 2,
anotherProp: 4,
moreProps: 5 },
{ propertyName: { someVeryLongPropertyName: true,
qux: 6,
zap: "lol" } } ] }
With stringify.noRightAlignKeys (obj)
or rightAlignKeys: false
, if you don't want the keys alignment:
{ obj: [ { someLongPropertyName: 1,
propertyName: 2,
anotherProp: 4,
moreProps: 5 },
{ propertyName: { someVeryLongPropertyName: true,
qux: 6,
zap: "lol" } } ] }
With stringify.noFancy (obj)
or fancy: false
, if you want classic nesting:
{
obj: [
{
someLongPropertyName: 1,
propertyName: 2,
anotherProp: 4,
moreProps: 5
},
{
propertyName: {
someVeryLongPropertyName: true,
qux: 6,
zap: "lol"
}
}
]
}
In the "no fancy" mode you can also set the indentation width by:
stringify.configure ({ fancy: false, indentation: ' ' }) (obj)
{
obj: [
{
propertyName: 2,
moreProps: 5
}
]
}
As you can see, by default it does some fancy alignment to make complex nested objects look more readable:
It automatically detects whether the pretty printing is nessesary. If the output isn't lenghty, it renders as single line:
stringify ({ foo: 1, bar: 2 })
It also works with nested objects. Setting maxLength
(defaults to 50
):
stringify.maxLength (70) ({ asks: [{ price: "1000", amount: 10 }, { price: "2000", amount: 10 }],
bids: [{ price: "500", amount: 10 }, { price: "100", amount: 10 }] })
Example output for maxLength
set to 70
, 50
and 20
, respectively):
{ asks: [{ price: "1000", amount: 10 }, { price: "2000", amount: 10 }],
bids: [{ price: "500", amount: 10 }, { price: "100", amount: 10 }] }
{ asks: [ { price: "1000", amount: 10 },
{ price: "2000", amount: 10 } ],
bids: [ { price: "500", amount: 10 },
{ price: "100", amount: 10 } ] }
{ asks: [ { price: "1000",
amount: 10 },
{ price: "2000",
amount: 10 } ],
bids: [ { price: "500",
amount: 10 },
{ price: "100",
amount: 10 } ] }
Forcing single-line rendering by setting { pretty: false }
or with noPretty
chain helper:
stringify.noPretty
({ nil: null, nope: undefined, fn: function ololo () {}, bar: [{ baz: "garply", qux: [1, 2, 3] }] })
Configuring
Configuring goes like this:
stringify.configure ({ }) (...)
You can stack .configure
calls, as it simply returns a new function instance with config params applied:
stringify = require ('string.ify').configure ({ ... })
...
stringify.configure ({ ... }) (obj)
Configuration parameters have chain-style setter methods:
stringify.pure.noPretty.maxDepth (10) (...)
It's the same as calling configure
with:
stringify.configure ({ pure: true, pretty: false, maxDepth: 10 }) (...)
All (default) config options:
stringify.configure ({
pure: false,
json: false,
maxDepth: 5,
maxLength: 50,
maxArrayLength: 60,
maxObjectLength: 200,
maxStringLength: 60,
precision: undefined,
formatter: undefined,
pretty: 'auto',
rightAlignKeys: true,
fancy: true,
indentation: ' ',
}) (...)
Collapsing Lengthy Output
It handles global
and window
references, so it wont mess up your output:
stringify ({ root: global })
Cyclic references:
var obj = {}
obj.foo = { bar: [obj] }
stringify (obj)
Collapsing multiple references to the same object:
var obj = {}
stringify ([obj, obj, obj])
It even understands jQuery objects and DOM nodes:
$('<button id="send" class="red" /><button class="blue" />']).appendTo (document.body)
stringify ($('button'))
stringify (document.createTextNode ('some text'))
Setting maxDepth
(defaults to 5
) and maxArrayLength
(defaults to 60
):
stringify.maxDepth (2).maxArrayLength (5) ({ a: { b: { c: 0 } }, qux: [1,2,3,4,5,6] }),
Setting maxObjectLength
(defaults to 200
):
stringify.maxObjectLength (6) ({ long: { a: 1, b: 2, c: 3, d: 4, e: 5, f: 6 } })
Setting maxStringLength
(default is 60
):
stringify.maxStringLength (4) ({ yo: 'blablablabla' })
Empty argument means no limit:
stringify.maxDepth () (...)
Other Configuration Options
JSON-compatible output:
stringify.json ({ foo: { bar: 'baz' } })
JavaScript output:
stringify.pure ({ yo: function () { return 123 } })
Setting floating-point output precision:
stringify ({ a: 123, b: 123.000001 })
stringify.precision (2) ({ a: 123, b: 123.000001 })
Custom rendering
With ad-hoc formatter
booleansAsYesNo = stringify.formatter (x => (typeof x === 'boolean' ? (x ? 'yes' : 'no') : undefined))
booleansAsYesNo ({ a: { b: true }, c: false }),
Return undefined
to fallback to the default formatter.
With Symbols
If you don't know what they are, read this article. Symbols are awesome! They allow to add hidden properties (i.e. metadata) to arbitrary objects. String.ify uses this mechanism to implement custom formatters on rendered objects:
Boolean.prototype[Symbol.for ('String.ify')] = function (stringify) {
return this ? 'yes' : 'no' }
stringify ({ a: { b: true }, c: false })
Note how a stringify
is passed as an argument to a renderer function. Call it to render nested contents. Current config options are available as properties of that function. You can override them by calling the configure
method. Here's an example of adding purple ANSI color to rendered arrays:
Array.prototype[Symbol.for ('String.ify')] = function (stringify) {
return '\u001B[35m[' + this.map (stringify).join (', ') + ']\u001b[0m'
}
stringify ({ a: [{ foo: 42, bar: 43 }, 44, 45, 46] })
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- Ololog — a platform-agnostic logging powered with String.ify