Json.parse() in JavaScript
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json.parse() converts a JSON string into a JavaScript object. It accepts a string value and an optional reviver function to modify the parsed values. The document includes examples demonstrating the syntax and the use of the reviver function.
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![JSON.parse() takes a JSON string and transforms it
into a JavaScript object.
Syntax:
JSON.parse( stringValue, [reviver] );
- stringValue JSON-string to parse
- reviver function(key, value), function to
transform the value
const json = ‘{"string":"Hello
Nugget!","number":123456,
"boolean":false,"test":null}’;
let obj = JSON.parse(json);
console.log(obj);
console.log(obj.string);
//Output
{
string: “Hello Nugget!”,
number: 123456,
boolean: false,
null: null
}
Hello Nugget!](https://image.slidesharecdn.com/ilsiv9nsqwrgqbsnfgew-signature-532f4a33c26a739923d5fdcf3cdebd912654975cf20903351a97f459c1f97aab-poli-200616031520/85/Json-parse-in-JavaScript-2-320.jpg)
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Json.parse() in JavaScript
- 2. JSON.parse() takes a JSON string and transforms it into a JavaScript object. Syntax: JSON.parse( stringValue, [reviver] ); - stringValue JSON-string to parse - reviver function(key, value), function to transform the value const json = ‘{"string":"Hello Nugget!","number":123456, "boolean":false,"test":null}’; let obj = JSON.parse(json); console.log(obj); console.log(obj.string); //Output { string: “Hello Nugget!”, number: 123456, boolean: false, null: null } Hello Nugget!
- 3. // Output { string: “Hello Nugget!”, number: 123456, boolean: “setting true”, null: null } true JSON.parse(jsonString, function(key, value) { // some operation // return value for the key return value; }); Using reviver function: This function is to modify the result before returning. let obj = JSON.parse(json, (key, value) => { return key === ‘boolean’ ? ‘setting true’: true }); console.log(obj); console.log(obj.boolean);