Paste minified or messy JSON into a browser-based JSON formatter and it re-indents the structure into a clean, nested layout you can actually read, while validating it at the same time. The formatting runs on your device, so an API response full of tokens or personal data is never uploaded, and any syntax error is flagged so you can find it.
JSON that arrives over the wire is usually minified into one long line with no whitespace, which is efficient to transmit but impossible to read. A formatter parses it and re-emits it with consistent indentation, so nested objects and arrays line up and you can follow the structure at a glance. The data is untouched; only the whitespace changes, which is what makes debugging an API payload bearable.
To indent JSON a formatter first has to parse it, so it can only pretty-print valid JSON. That means it doubles as a validator: if a comma is missing or a bracket is unbalanced, it points you at the problem instead of silently producing garbage. Because real payloads often carry credentials or emails, doing all of this in the browser keeps that data on your machine rather than pasting it into a server-side tool.
No. Only whitespace and indentation change; the values and structure stay identical.
Yes. It parses before formatting, so a missing comma or bracket is flagged rather than formatted.
No. Formatting and validation run entirely in your browser.