Golang React JS Technology Blog

Different ways to validate JSON string

Check if string is valid JSON
In the below program isJSON function is used to validate given string contains valid JSON or not.

Example

package main

import (
	"encoding/json"
	"fmt"
)

var Object = `{
	"userId": 1,
	"id": 1,
	"title": "delectus aut autem",
	"completed": false
}`
var Array = `[{"key": "value1"}, {"key": "value2"}]`

func isJSON(s string) bool {
	var js interface{}
	return json.Unmarshal([]byte(s), &js) == nil
}

func main() {
	val1 := isJSON(Object)
	fmt.Println(val1)

	val2 := isJSON(Array)
	fmt.Println(val2)
}

Output

true
true
JSON validate using Standard Library function

Example

package main

import (
	"fmt"
	"encoding/json"
)

func main() {
       var tests = []string{
		`"Platypus"`,
		`Platypus`,
		`{"id":"1"}`,
		`{"id":"1}`,
	}

	for _, t := range tests {
		fmt.Printf("Is valid: (%s) = %v\n", t, json.Valid([]byte(t)))
		
	}

}

Output

Is valid: ("Platypus") = true
Is valid: (Platypus) = false
Is valid: ({"id":"1"}) = true
Is valid: ({"id":"1}) = false
Most Helpful This Week
How to find length of Map in Go? How to compare equality of struct, slice and map? How to include and execute HTML template? Get Hours, Days, Minutes and Seconds difference between two dates [Future and Past] URL parser in Golang How to use for and foreach loop?