How Can I Validate the JSON Format of a String in Golang?

Validating JSON Format

In the realm of programming, managing data exchange often involves dealing with JSON strings. To ensure proper handling and interpretation, it becomes necessary to ascertain whether a given string conforms to the JSON format. This article introduces a method for validating JSON strings using Go's built-in JSON package.

Implementation

As stated in the question, the task is to create a function, checkJson, that takes a string as input and determines if it's in JSON format. The following function utilizes Go's json.Unmarshal function for this purpose:

import (
    "encoding/json"
)

// isJSON validates if a string is in JSON format.
func isJson(input string) bool {
    var js json.RawMessage
    return json.Unmarshal([]byte(input), &js) == nil
}

The function first converts the input string to a byte array using []byte(input). It then attempts to unmarshal the byte array into a json.RawMessage object. If the unmarshaling is successful, it indicates that the string is in JSON format, and the function returns true. Otherwise, it returns false.

Example Usage

Using the isJson function, you can easily validate JSON strings:

jsonStr := `{"name": "John Doe", "age": 30}`
if isJson(jsonStr) {
    fmt.Println("It's JSON!")
} else {
    fmt.Println("It's not JSON.")
}

Note

It's important to remember that the isJson function only checks if a string is in JSON format. It does not validate the structure or schema of the JSON string. If your application requires stricter validation, you may need to implement additional checks or use a JSON schema validation library.

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