spring-boot-rest/json-2/src/main/java/com/baeldung/jsonvalidation/GsonValidator.java

package com.baeldung.jsonvalidation;

import java.io.IOException;

import com.google.gson.Gson;
import com.google.gson.JsonElement;
import com.google.gson.JsonParser;
import com.google.gson.JsonSyntaxException;
import com.google.gson.TypeAdapter;

public class GsonValidator {

    final TypeAdapter<JsonElement> strictAdapter = new Gson().getAdapter(JsonElement.class);

    public boolean isValid(String json) {
        try {
            JsonParser.parseString(json);
        } catch (JsonSyntaxException e) {
            return false;
        }
        return true;
    }

    public boolean isValidStrict(String json) {
        try {
            strictAdapter.fromJson(json);
        } catch (JsonSyntaxException | IOException e) {
            return false;
        }
        return true;
    }
}