JS Throwing Error
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let json = '{ "name": "Yoda", "age": 20 }';
try {
let user = JSON.parse(json);
console.log(user.name);
console.log(user.age);
} catch (error) {
console.log(error.name);
console.log(error.message);
}
let son = '{ "age": 20 }';
try {
let user = JSON.parse(son);
console.log(user.name); // undefined
console.log(user.age); // 20
} catch (error) {
console.log(error.name);
console.log(error.message);
}
//throw
let mson = '{ "age": 20 }';
try {
let user = JSON.parse(mson);
if (!user.name) {
throw new SyntaxError("'name' is required.");
}
console.log(user.name); // undefined
console.log(user.age); // 20
} catch (error) {
console.log(`JSON Error: ${error.message}`);
}
let ason = '{ "name": "Yoda", "age": 20 }';
try {
let user = JSON.parse(ason);
if (!user.name) {
throw new SyntaxError("'name' is required.");
}
errorCode;
console.log(user.name); // Yoda
console.log(user.age); // 20
} catch (error) {
if (error instanceof SyntaxError) {
console.log(`JSON Error: ${error.message}`);
} else if (error instanceof ReferenceError) {
console.log(error.message);
} else {
console.log(error.stack);
}
}
/* output
JSON Error: errorCode is not defined
*/
JavaScript
INFO