Online JSON Viewer

A JSON viewer renders a payload as a structured, color-coded document you can browse without modifying — nested objects and arrays collapse into a navigable tree. JSON Pretty's viewer also lints what you paste, so any malformed input is flagged with the exact line.

Every object and array gets a fold control in the gutter. Click a chevron to collapse a subtree out of the way, or expand only the parts you care about. Keys, strings, numbers, booleans, and null all get distinct colors, so a deep structure reads at a glance.

Yes — install the Chrome extension and any URL that returns JSON opens already rendered as a viewer, with the same fold and raw/pretty controls. No paste step, no second tab.

Yes. Parsing happens off the main thread, so the page stays responsive even when you drop in a large JSON file. Folded nodes are not rendered until you expand them, which keeps scrolling smooth.

A viewer is for reading and exploring — you scan, search, copy. An editor lets you change the data in place. JSON Pretty includes both: read in the viewer, then jump to the editor with one click if you need to modify the document.

Yes. The viewer parses and renders everything locally. JSON Pretty never sends your data to a server, never logs it, and never stores it outside your machine.