jsondiff

README

JsonDiff library

The main purpose of the library is integration into tests which use json and providing human-readable output of test results.

The lib can compare two json items and return a detailed report of the comparison.

At the moment it can detect a couple of types of differences:

• FullMatch - means items are identical.
• SupersetMatch - means first item is a superset of a second item.
• NoMatch - means objects are different.

Being a superset means that every object and array which don't match completely in a second item must be a subset of a first item. For example:

{"a": 1, "b": 2, "c": 3}

Is a superset of (or second item is a subset of a first one):

{"a": 1, "c": 3}

Library API documentation can be found on godoc.org: https://godoc.org/github.com/nsf/jsondiff

You can try LIVE version here (thanks to gopherjs): https://nosmileface.dev/jsondiff

The library is inspired by http://tlrobinson.net/projects/javascript-fun/jsondiff/

Documentation

Index

• type Difference
  • func Compare(a, b []byte, opts *Options) (Difference, string)
  • func (d Difference) String() string
• type Options
  • func DefaultConsoleOptions() Options
  • func DefaultHTMLOptions() Options
  • func DefaultJSONOptions() Options
• type Tag

Types

type Difference

type Difference int

const (
	FullMatch Difference = iota
	SupersetMatch
	NoMatch
	FirstArgIsInvalidJson
	SecondArgIsInvalidJson
	BothArgsAreInvalidJson
)

func Compare

func Compare(a, b []byte, opts *Options) (Difference, string)

Compares two JSON documents using given options. Returns difference type and a string describing differences.

FullMatch means provided arguments are deeply equal.

SupersetMatch means first argument is a superset of a second argument. In this context being a superset means that for each object or array in the hierarchy which don't match exactly, it must be a superset of another one. For example:

{"a": 123, "b": 456, "c": [7, 8, 9]}

Is a superset of:

{"a": 123, "c": [7, 8]}

NoMatch means there is no match.

The rest of the difference types mean that one of or both JSON documents are invalid JSON.

Returned string uses a format similar to pretty printed JSON to show the human-readable difference between provided JSON documents. It is important to understand that returned format is not a valid JSON and is not meant to be machine readable.

func (Difference) String

func (d Difference) String() string

type Options

type Options struct {
	Normal           Tag
	Added            Tag
	Removed          Tag
	Changed          Tag
	Prefix           string
	Indent           string
	PrintTypes       bool
	ChangedSeparator string
}

func DefaultConsoleOptions

func DefaultConsoleOptions() Options

Provides a set of options that are well suited for console output. Options use ANSI foreground color escape sequences to highlight changes.

func DefaultHTMLOptions

func DefaultHTMLOptions() Options

Provides a set of options that are well suited for HTML output. Works best inside <pre> tag.

func DefaultJSONOptions

func DefaultJSONOptions() Options

Provides a set of options in JSON format that are fully parseable.

type Tag

type Tag struct {
	Begin string
	End   string
}