FormData.prototype.delete
Deletes a key and all its values from a FormData object
Syntax
formData.delete(name)Parameters
| Parameter | Type | Description |
|---|---|---|
| name | string | The name of the key to delete |
Return Value
undefined
Examples
const fd = new FormData()
fd.append('name', 'Alice')
fd.delete('name')
console.log(fd.has('name')) // falsefunction sanitizeFormData(fd: FormData, exclude: string[]) {
exclude.forEach(key => fd.delete(key))
return fd
}const fd = new FormData()
fd.append('token', 'secret')
fd.append('data', 'value')
fd.delete('token')
console.log([...fd.keys()]) // ['data']Understanding FormData.prototype.delete
The FormData.prototype.delete method in JavaScript deletes a key and all its values from a FormData object. It belongs to the FormData object and is one of the most widely used methods for working with formdata values in modern JavaScript and TypeScript applications.
The method signature is formData.delete(name). It accepts 1 parameter: name. When called, it returns undefined. Understanding when and how to use delete() helps you write more expressive, readable code.
Common use cases for FormData.prototype.delete include data transformation, input validation, API response processing, and building reusable utility functions. It works well alongside related methods like fetch-formdata-get, fetch-formdata-set, fetch-formdata-append, enabling you to chain operations together for complex data manipulation pipelines.
Browser support for FormData.prototype.delete is excellent across all modern browsers including Chrome, Firefox, Safari, and Edge. It is also fully supported in Node.js and Deno. For older environments, transpilation with Babel or a polyfill may be needed.
Browser Compatibility
Supported in all modern browsers (Chrome, Firefox, Safari, Edge) and Node.js. Part of the ECMAScript standard.
Related Methods
FormData.prototype.getReturns the first value associated with a given key from within a FormData object
FormData.prototype.setSets a new value for an existing key, or adds the key/value if it does not already exist, unlike append which adds another value
FormData.prototype.appendAppends a new value onto an existing key inside a FormData object, or adds the key if it does not already exist
More FormData Methods
Other methods in the FormData object
Related Tools
More FormData Methods
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