Debugging an API response, checking a config file, or just trying to make sense of a wall of minified JSON is a lot easier with a proper viewer instead of squinting at raw text. This tool validates your JSON as you type, tells you exactly where it breaks if it's invalid, and lets you explore it as a collapsible tree or a cleanly formatted, indented view.
The tool shows exactly what's wrong and where, using the browser's own JSON parser error, including the line and column it choked on, so you can find and fix the problem quickly.
No hard limit is enforced, though very large JSON (megabytes of text) may feel slower to render as a tree, since your browser has to build and display every node.
No. Parsing and formatting both happen using your browser's own built-in JSON support. Nothing you paste is uploaded or stored.