JavaScript Pad start
padStart() pads the front of a string with a filler until it reaches a target length, returning the padded copy. It is the classic way to zero-pad numbers or align text in columns.
Syntax
str.padStart(targetLength, padString)Examples
| Input | Arguments | Output |
|---|---|---|
| "5" | 3, "0" | "005" |
| ↳ Zero-pad to width 3. | ||
When to use it
- Zero-pad numbers, times and IDs.
- Right-align text in fixed-width output.
Try it live
Type your input and see Pad start transform it instantly.
Want to go further? Chain Pad start with other functions in the visual Playground — pipe one output into the next and watch your data transform.