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>
}
Nested 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>
}
