Implementation of JSON Logic in Go Lang.
JSON Logic is a DSL to write logic decisions in JSON. It's has a great specification and is very simple to learn. The official website has a great documentation with examples.
The use of this library is very straightforward. Here's a simple example:
package main
import (
"bytes"
"fmt"
"strings"
"github.com/diegoholiveira/jsonlogic/v3"
)
func main() {
logic := strings.NewReader(`{"==": [1, 1]}`)
data := strings.NewReader(`{}`)
var result bytes.Buffer
jsonlogic.Apply(logic, data, &result)
fmt.Println(result.String())
}
This will output true
in your console.
Here's another example, but this time using variables passed in the data
parameter:
package main
import (
"bytes"
"encoding/json"
"fmt"
"strings"
"github.com/diegoholiveira/jsonlogic/v3"
)
type (
User struct {
Name string `json:"name"`
Age int `json:"age"`
Location string `json:"location"`
}
Users []User
)
func main() {
logic := strings.NewReader(`{
"filter": [
{"var": "users"},
{">=": [
{"var": ".age"},
18
]}
]
}`)
data := strings.NewReader(`{
"users": [
{"name": "Diego", "age": 33, "location": "Florianópolis"},
{"name": "Jack", "age": 12, "location": "London"},
{"name": "Pedro", "age": 19, "location": "Lisbon"},
{"name": "Leopoldina", "age": 30, "location": "Rio de Janeiro"}
]
}`)
var result bytes.Buffer
err := jsonlogic.Apply(logic, data, &result)
if err != nil {
fmt.Println(err.Error())
return
}
var users Users
decoder := json.NewDecoder(&result)
decoder.Decode(&users)
for _, user := range users {
fmt.Printf(" - %s\n", user.Name)
}
}
This project is licensed under the MIT License - see the LICENSE file for details