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JavaScript - removing undefined fields from object
1 answers
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How can I remove properties from object that are undefined or null?
1 answer
0 points
Quick solution (ES6+):
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const newObject = Object.fromEntries(Object.entries(myObject).filter(([_, value]) => value != null));Reusable arrow function
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const removeBlank = (inputObject) => {2
return Object.fromEntries(3
Object.entries(inputObject).filter(([_, value]) => value != null)4
);5
}6
7
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// Usage example:9
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const myObject = { a: 1, b: '', c: undefined, d: null };11
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const newObject = removeBlank(myObject);13
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console.log(JSON.stringify(newObject)); // { a: 1, b: '' }Explanation:
To remove properties that are undefined or null we used the following methods:
Object.entries()- to get array of a given object's properties ([key, value]pairs),filter()- to remove properties that values arenullorundefined,Object.fromEntries()- to create a new result object from filtered[key, value]pairs.
Recursion to remove properties from nested objects
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const removeBlank = (inputObject) => {2
return Object.fromEntries(3
Object.entries(inputObject)4
.filter(([_, value]) => value != null)5
.map(([key, value]) => [6
key,7
value === Object(value) ? removeBlank(value) : value,8
])9
);10
};11
12
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// Usage example:14
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const myObject = {16
a: 1,17
b: { b1: undefined },18
c: { c1: null },19
};20
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const newObject = removeBlank(myObject);22
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console.log(JSON.stringify(newObject, null, 4)); // { a: 1, b: {}, c: {} }
References
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