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
Copy an array by value and reference into another array Example: How to use ReadAtLeast from IO Package in Golang? Split a string at uppercase letters using regular expression in Golang How to check if a string contains a substring in Golang? How to get current IP form ipify.org ? How to concatenate two or more slices in Golang?