JSON viewer

JSON viewer features

• 01

  One pane, three actions

  Format pretty-prints your JSON in place, Minify collapses it to a single line, and Check confirms it's valid without changing a thing.

• 02

  Configurable indentation

  Switch between 2-space, 4-space and tab indentation in one click. The viewer reformats immediately so you can match your project's style.

• 03

  100% private, works offline

  Your JSON never leaves your device. Parsing runs in your browser with the native JSON engine, so the viewer keeps working even without a network connection.

JSON viewer FAQ

How do I view JSON in the browser?

Paste your JSON into the editor and click Format. The pane updates in place with a pretty-printed version using your chosen indentation. Nothing is uploaded — everything happens locally.

What does the Check button do?

Check parses your JSON without modifying it. If it's valid you'll see a confirmation; if not, you'll see the exact error message and the position where parsing failed.

Why is my JSON invalid?

Common causes are trailing commas, single quotes around strings, unquoted keys, or comments — none of which are allowed by the JSON specification. The error message highlights where parsing failed.

Is my JSON sent to a server?

No. The viewer runs entirely in your browser using JavaScript's built-in JSON parser. Your data is never uploaded, logged or stored.

Is there a size limit?

No hard cap, but very large documents (tens of megabytes) may take a moment to render. The viewer handles typical API responses and config files instantly.

Is the JSON viewer free?

Yes. Every Handytool is free, with no accounts, sign-ups or usage limits.