Syntax
navigator.clipboard.writeText(text)
navigator.clipboard.readText()Examples
Copying Text to the Clipboard
A common "copy to clipboard" button implementation.
async function copyToClipboard(text) {
try {
await navigator.clipboard.writeText(text);
console.log("Copied to clipboard!");
} catch (error) {
console.log("Failed to copy:", error.message);
}
}
document.querySelector("#copyButton").addEventListener("click", () => {
copyToClipboard("https://example.com/share-link");
});Reading from the Clipboard
Pasting programmatically, which requires explicit user permission.
async function pasteFromClipboard() {
try {
const text = await navigator.clipboard.readText();
console.log("Clipboard contains:", text);
} catch (error) {
console.log("Clipboard access denied or unavailable");
}
}Best practices
- Always wrap Clipboard API calls in try/catch - both permissions and browser support can cause them to fail
- Trigger clipboard writes directly from a user gesture (like a click handler) - browsers block clipboard access outside of direct user interaction
- Remember the API requires a secure context (HTTPS or localhost) - it will not work on plain HTTP
- Provide clear visual feedback (like a "Copied!" tooltip) after a successful copy, since there is no built-in browser indication
At a glance
- Purpose
- Application logic and interaction
- File extension
- .js ยท .mjs
- Runs in
- Browsers and JavaScript runtimes
- Usually used with
- HTML, CSS and Web APIs
Specifications & further reading
Related JavaScript documentation
Arrow Functions
Arrow functions provide a more concise syntax for writing function expressions in JavaScript. Introduced in ES6, they use the => syntax and have some important differences from regular functions, particularly in how they handle the "this" keyword. Arrow functions are especially useful for callbacks, array methods, and short inline functions.Variables: var, let, const
JavaScript has three ways to declare variables. var is the original way, function-scoped and hoisted with a default value of undefined. let, introduced in ES6, is block-scoped and can be reassigned. const is also block-scoped but cannot be reassigned after its initial value is set. Modern JavaScript strongly favors let and const over var.Data Types
JavaScript has seven primitive data types - string, number, boolean, undefined, null, bigint, and symbol - plus the object type, which includes arrays, functions, and plain objects. JavaScript is dynamically typed, meaning a variable can hold any type and that type can change. The typeof operator reports a value's type at runtime.Arithmetic Operators
Arithmetic operators perform mathematical calculations on numbers: addition (+), subtraction (-), multiplication (*), division (/), remainder/modulo (%), and exponentiation (**). The + operator also performs string concatenation when either operand is a string. Increment (++) and decrement (--) adjust a variable by one.
Arrow functions provide a more concise syntax for writing function expressions in JavaScript. Introduced in ES6, they use the => syntax and have some important differences from regular functions, particularly in how they handle the "this" keyword. Arrow functions are especially useful for callbacks, array methods, and short inline functions.Variables: var, let, const
JavaScript has three ways to declare variables. var is the original way, function-scoped and hoisted with a default value of undefined. let, introduced in ES6, is block-scoped and can be reassigned. const is also block-scoped but cannot be reassigned after its initial value is set. Modern JavaScript strongly favors let and const over var.Data Types
JavaScript has seven primitive data types - string, number, boolean, undefined, null, bigint, and symbol - plus the object type, which includes arrays, functions, and plain objects. JavaScript is dynamically typed, meaning a variable can hold any type and that type can change. The typeof operator reports a value's type at runtime.Arithmetic Operators
Arithmetic operators perform mathematical calculations on numbers: addition (+), subtraction (-), multiplication (*), division (/), remainder/modulo (%), and exponentiation (**). The + operator also performs string concatenation when either operand is a string. Increment (++) and decrement (--) adjust a variable by one.