Calculator
What the JS Formatter does
JS Formatter: formats Status and Output from JavaScript Input. Example: the sample loaded on the page gives status Beautified.
Status and Output, derived from JavaScript Input. Results refresh instantly, so trying variations costs nothing but a moment.
Spotting a malformed field is far quicker when the structure is laid out clearly. That is usually what brings developers debugging a payload here.
Payloads stay in the tab, so you can safely paste production data without it reaching a third party.
If you want to check the arithmetic, the field table, the method and a worked example are further down.
What do the JS Formatter fields mean?
The JS Formatter uses 1 input. A complete set of starting values is loaded for you, so nothing is required before the first result appears.
| Field | What to enter | Default |
|---|---|---|
| JavaScript Input | paste or type any amount of text | function add(a,b){return a+b;} const x={a:1,b:2}; |
How does the JS Formatter work?
Each output is derived from the inputs above in a single pass; there is no hidden state carried between runs, so the same inputs always give the same formatted output.
Values are checked first: an out-of-range or non-numeric entry names the offending field instead of returning nonsense.
Worked example
These are the values the JS Formatter loads by default, and the result it produces from them. This walkthrough uses the starting values, which means you can follow along without typing anything.
| JavaScript Input | function add(a,b){return a+b;} const x={a:1,b:2}; |
|---|
| Status | Beautified |
|---|---|
| Output | function add(a, b){ return a+b; } const x={ a:1, b:2 }; |
How to use it
- Paste your content into JavaScript Input.
- Watch the results panel as you type: it recalculates on every keystroke.
- The panel reports Status and Output.
- Share the link rather than a screenshot. It carries the values with it.
What this tool does not do
- Output follows the common convention for this format; a specific toolchain may have its own house style.
- Processing happens in your browser, so very large inputs are bounded by available memory.
- Results are informational: check anything consequential against a second source.
Frequently asked questions
You need JavaScript Input. Each field is pre-filled with a sensible default, meaning you can explore the calculation before committing to real figures.
With the values loaded when the page opens, status comes out as Beautified. Change a value and the number is recomputed on the spot.
Nothing is logged. The tool is client-side code; your data stays where you entered it.
It is free to use, with no premium tier holding back the useful parts.
The formatted output is exact for the method described above. Where a value is rounded for display, the underlying figure keeps full precision.