jsonyo.
local json validator + formatter + JMESPath queries.
paste json or click 'inspect this page' to grab the dom's json. validate with ajv, query with JMESPath, format on the fly. nothing leaves the tab.
v1.0.0·published 2026·manifest v3
want the shortest path to install? read the install guide → or compare WordPress vs browser first.
wondering how jsonyo stacks up against JSON Formatter or JSON Viewer? see the full comparison →
prefer the command line? jsonyo also ships as a free npm cli — pipe JSON, run JMESPath queries, pretty-print, validate →
using WordPress? jsonyo JSON Toolkit is a free wp-admin plugin on WordPress.org →
four things, in four lines.
AJV validation
json-schema (draft-07/2019/2020) right in the popup. errors shown with line + path.
JMESPath queries
compose queries with autocomplete. instant preview against pasted json.
inspect this page
extracts inline json from the current tab (script[type=application/ld+json] etc).
zero round-trips
pure browser. no server, no rate limit.
four states of the popup.
stylized previews of the popup in four different states — same look as the hero mock above. the current browser-store pack uses the same popup states, and this gallery stays stylized for now.
required pages.
every extension here ships a full paddle-compliant suite. no hidden terms, no opt-out cookies, no email-grab on first install.