JSON Pretty

JSON Pretty is a Go package that provides fast methods for formatting JSON for human readability, or to compact JSON for smaller payloads.

JSON Pretty is forked from tidwall/pretty.

Getting Started

Installing

To start using Pretty, install Go and run go get:

go get -u github.com/tidwall/pretty

This will retrieve the library.

Pretty

Using this example:

{"name":  {"first":"Tom","last":"Anderson"},  "age":37,
"children": ["Sara","Alex","Jack"],
"fav.movie": "Deer Hunter", "friends": [
    {"first": "Janet", "last": "Murphy", "age": 44}
  ]}

The following code:

result = pretty.Pretty(example)

Will format the json to:

{
  "name": {
    "first": "Tom",
    "last": "Anderson"
  },
  "age": 37,
  "children": ["Sara", "Alex", "Jack"],
  "fav.movie": "Deer Hunter",
  "friends": [
    {
      "first": "Janet",
      "last": "Murphy",
      "age": 44
    }
  ]
}

Color

Color will colorize the json for outputing to the screen.

result = pretty.Color(json, nil)

Will add color to the result for printing to the terminal. The second param is used for a customizing the style, and passing nil will use the default pretty.TerminalStyle.

Ugly

The following code:

result = pretty.Ugly(example)

Will format the json to:

{"name":{"first":"Tom","last":"Anderson"},"age":37,"children":["Sara","Alex","Jack"],"fav.movie":"Deer Hunter","friends":[{"first":"Janet","last":"Murphy","age":44}]}

Customized output

There's a PrettyOptions(json, opts) function which allows for customizing the output with the following options:

type Options struct {
	// Width is an max column width for single line arrays
	// Default is 80
	Width int
	// Prefix is a prefix for all lines
	// Default is an empty string
	Prefix string
	// Indent is the nested indentation
	// Default is two spaces
	Indent string
	// SortKeys will sort the keys alphabetically
	// Default is false
	SortKeys bool
}

Performance

Benchmarks of Pretty alongside the builtin encoding/json Indent/Compact methods.

BenchmarkPretty-16           1000000    1034 ns/op    720 B/op     2 allocs/op
BenchmarkPrettySortKeys-16    586797    1983 ns/op   2848 B/op    14 allocs/op
BenchmarkUgly-16             4652365     254 ns/op    240 B/op     1 allocs/op
BenchmarkUglyInPlace-16      6481233     183 ns/op      0 B/op     0 allocs/op
BenchmarkJSONIndent-16        450654    2687 ns/op   1221 B/op     0 allocs/op
BenchmarkJSONCompact-16       685111    1699 ns/op    442 B/op     0 allocs/op

These benchmarks were run on a MacBook Pro 2.4 GHz 8-Core Intel Core i9.

Contact

Le Minh Tri @ansidev.

License

JSON Pretty source code is available under the MIT License.