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Programming language: Go
Tags: Utilities    

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README

gojq

JSON query in Golang.

Install

go get -u github.com/elgs/gojq

This library serves three purposes:

  • makes parsing JSON configuration file much easier
  • enables JSON expression evaluation
  • reduces the pain of type assertion parsing JSON

Query from JSON Object

package main

import (
    "fmt"

    "github.com/elgs/gojq"
)

var jsonObj = `
{
  "name": "sam",
  "gender": "m",
  "pet": null,
  "skills": [
    "Eating",
    "Sleeping",
    "Crawling"
  ],
  "hello.world":true
}
`

func main() {
    parser, err := gojq.NewStringQuery(jsonObj)
    if err != nil {
        fmt.Println(err)
        return
    }
    fmt.Println(parser.Query("name"))          // sam <nil>
    fmt.Println(parser.Query("gender"))        // m <nil>
    fmt.Println(parser.Query("skills.[1]"))    // Sleeping <nil>
    fmt.Println(parser.Query("hello"))         // <nil> hello does not exist.
    fmt.Println(parser.Query("pet"))           // <nil> <nil>
    fmt.Println(parser.Query("."))             // map[name:sam gender:m pet:<nil> skills:[Eating Sleeping Crawling] hello.world:true] <nil>
    fmt.Println(parser.Query("'hello.world'")) // true <nil>
}

Query from JSON Array

package main

import (
    "fmt"
    "github.com/elgs/gojq"
)

var jsonArray = `
[
  {
    "name": "elgs",
    "gender": "m",
    "skills": [
      "Golang",
      "Java",
      "C"
    ]
  },
  {
    "name": "enny",
    "gender": "f",
    "skills": [
      "IC",
      "Electric design",
      "Verification"
    ]
  },
  {
    "name": "sam",
    "gender": "m",
    "pet": null,
    "skills": [
      "Eating",
      "Sleeping",
      "Crawling"
    ]
  }
]
`

func main() {
    parser, err := gojq.NewStringQuery(jsonArray)
    if err != nil {
        fmt.Println(err)
        return
    }
    fmt.Println(parser.Query("[0].name"))       // elgs <nil>
    fmt.Println(parser.Query("[1].gender"))     // f <nil>
    fmt.Println(parser.Query("[2].skills.[1]")) // Sleeping <nil>
    fmt.Println(parser.Query("[2].hello"))      // <nil> hello does not exist.
    fmt.Println(parser.Query("[2].pet"))        // <nil> <nil>
}

Netsted Query

package main

import (
    "fmt"
    "github.com/elgs/gojq"
)

var jsonArray = `
[
  {
    "name": "elgs",
    "gender": "m",
    "skills": [
      "Golang",
      "Java",
      "C"
    ]
  },
  {
    "name": "enny",
    "gender": "f",
    "skills": [
      "IC",
      "Electric design",
      "Verification"
    ]
  },
  {
    "name": "sam",
    "gender": "m",
    "pet": null,
    "skills": [
      "Eating",
      "Sleeping",
      "Crawling"
    ]
  }
]
`

func main() {
    parser, err := gojq.NewStringQuery(jsonArray)
    if err != nil {
        fmt.Println(err)
        return
    }
    samSkills, err := parser.Query("[2].skills")
    fmt.Println(samSkills, err) //[Eating Sleeping Crawling] <nil>
    samSkillParser := gojq.NewQuery(samSkills)
    fmt.Println(samSkillParser.Query("[1]")) //Sleeping <nil>
}