Optimized JSON for Go is a high performance parser with a variety of additional JSON tools.

Features

• Fast JSON parser. Check out the cmd/benchmarks app in this repo.
• Full JSONPath implemenation that operates on simple types as well as structs.
• Generic types. Not the proposed golang generics but type safe JSON elements.
• Fast JSON validator (7 times faster with io.Reader).
• Fast JSON writer with a sort option (4 times faster).
• JSON builder from JSON sources using a simple assembly plan.
• Simple data builders using a push and pop approach.
• Object encoding and decoding using an approach similar to that used with Oj for Ruby.
• Simple Encoding Notation, a lazy way to write JSON omitting commas and quotes.

Using

A basic Parse:

    obj, err := oj.ParseString(`{
        "a":[
            {"x":1,"y":2,"z":3},
            {"x":2,"y":4,"z":6}
        ]
    }`)

Using JSONPath expressions:

    x, err := jp.ParseString("a[?(@.x > 1)].y")
    ys := x.Get(obj)
    // returns [4]

The oj command (cmd/oj) which uses JSON path for filtering and extracting JSON elements. It also includes sorting, reformatting, and colorizing options.

$ oj -m "(@.name == 'Pete')" myfile.json

Installation

go get github.com/ohler55/ojg
go get github.com/ohler55/ojg/cmd/oj

or just import in your .go files.

import (
    "github.com/ohler55/ojg/alt"
    "github.com/ohler55/ojg/asm"
    "github.com/ohler55/ojg/gen"
    "github.com/ohler55/ojg/jp"
    "github.com/ohler55/ojg/oj"
    "github.com/ohler55/ojg/sen"
)

To build and install the oj application:

go install ./...

Benchmarks

Higher numbers (longer bars) are better.

Parse string/[]byte
       json.Unmarshal       40464 ns/op   17984 B/op     336 allocs/op
         oj.Parse           22845 ns/op   18783 B/op     431 allocs/op
   oj-reuse.Parse           17546 ns/op    5984 B/op     366 allocs/op

   oj-reuse ███████████████████████  2.31
         oj █████████████████▋ 1.77
       json ▓▓▓▓▓▓▓▓▓▓ 1.00

Parse io.Reader
       json.Decode          51431 ns/op   32657 B/op     346 allocs/op
         oj.ParseReader     26502 ns/op   22881 B/op     432 allocs/op
   oj-reuse.ParseReader     20803 ns/op   10080 B/op     367 allocs/op

   oj-reuse ████████████████████████▋ 2.47
         oj ███████████████████▍ 1.94
       json ▓▓▓▓▓▓▓▓▓▓ 1.00

to JSON with indentation
       json.Marshal         71587 ns/op   27327 B/op     352 allocs/op
         oj.JSON            11950 ns/op    4096 B/op       1 allocs/op
        sen.String          12524 ns/op    4096 B/op       1 allocs/op

         oj ███████████████████████████████████████████████████████████▉ 5.99
        sen █████████████████████████████████████████████████████████▏ 5.72
       json ▓▓▓▓▓▓▓▓▓▓ 1.00

See all benchmarks

Compare Go JSON parsers

Releases

See CHANGELOG.md

Links

• Documentation: https://pkg.go.dev/github.com/ohler55/ojg

• GitHub repo: https://github.com/ohler55/ojg

• JSONPath description: https://goessner.net/articles/JsonPath

• JSONPath Comparisons https://cburgmer.github.io/json-path-comparison

Links of Interest

• Oj, a Ruby JSON parser: http://www.ohler.com/oj/doc/index.html also at https://github.com/ohler55/oj

• OjC, a C JSON parser: http://www.ohler.com/ojc/doc/index.html also at https://github.com/ohler55/ojc

• Fast XML parser and marshaller on GitHub: https://github.com/ohler55/ox

• Agoo, a high performance Ruby web server supporting GraphQL on GitHub: https://github.com/ohler55/agoo

• Agoo-C, a high performance C web server supporting GraphQL on GitHub: https://github.com/ohler55/agoo-c

Contributing

• Provide a Pull Request off the develop branch.
• Report a bug
• Suggest an idea