java-script:object-to-string-and-back
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java-script:object-to-string-and-back [2023/08/11 12:35] – [Object to String] odefta | java-script:object-to-string-and-back [2023/08/11 12:59] (current) – [Notes] odefta | ||
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Line 29: | Line 29: | ||
age: 30, | age: 30, | ||
toString: function() { | toString: function() { | ||
- | return `Name: ${this.name}, | + | return `{" |
} | } | ||
}; | }; | ||
- | const str = obj.toString(); | + | const str = obj.toString(); |
</ | </ | ||
+ | ===== String to Object ===== | ||
+ | **JSON.parse**: | ||
+ | <code javascript> | ||
+ | const str = ' | ||
+ | const obj = JSON.parse(str); | ||
+ | </ | ||
+ | |||
+ | ===== Notes ===== | ||
+ | |||
+ | < | ||
+ | **JSON.stringify** will only include properties that have enumerable **string keys**. It will exclude properties with symbol keys, and it will also **skip** values that are **undefined, | ||
+ | </ | ||
+ | |||
+ | < | ||
+ | **JSON.parse** expects a **valid JSON** string. If the string is not valid JSON, it will throw an error. | ||
+ | </ | ||
+ | |||
+ | < | ||
+ | If you're working with a more complex object structure that includes methods or other non-serializable values, you may need to implement custom serialization/ | ||
+ | </ | ||
+ | |||
+ | <note tip> | ||
+ | You can format the output of the **JSON.stringify** to be more easy to read or add transformation / filtering. | ||
+ | Syntax: | ||
+ | <code javascript> | ||
+ | JSON.stringify(value, | ||
+ | </ | ||
+ | * **value**: The value to convert to a JSON string. | ||
+ | * **replacer**: | ||
+ | * **space**: A String or Number object that's used to insert **white space** into the output JSON string for readability purposes. | ||
+ | |||
+ | Example: | ||
+ | <code javascript> | ||
+ | const obj = { | ||
+ | name: ' | ||
+ | age: 30, | ||
+ | friends: [' | ||
+ | }; | ||
+ | |||
+ | const jsonString = JSON.stringify(obj, | ||
+ | // 2 is the number of spaces for indentation | ||
+ | </ | ||
+ | |||
+ | Output: | ||
+ | <code javascript> | ||
+ | { | ||
+ | " | ||
+ | " | ||
+ | " | ||
+ | " | ||
+ | " | ||
+ | ] | ||
+ | } | ||
+ | </ | ||
+ | |||
+ | To ski age from being included: | ||
+ | <code javascript> | ||
+ | const obj = { name: ' | ||
+ | const filteredJSON = JSON.stringify(obj, | ||
+ | console.log(filteredJSON); | ||
+ | </ | ||
+ | </ |
java-script/object-to-string-and-back.1691746529.txt.gz · Last modified: 2023/08/11 12:35 by odefta