JSON (JavaScript Object Notation) is the standard format for API data transmission. Our suite of local JSON Utilities lets you format, validate, compress, and inspect complex data files without sending sensitive configurations, credentials, or client secrets to external servers.
Clean up minified, single-line, or messy JSON into readable, properly indented structure instantly in your browser. Pick your indent style — 2 spaces, 4 spaces, or tabs — and get copy-paste-ready output with syntax errors flagged at the exact line and column. 100% free and fully offline, so even API keys and production payloads never leave your machine.
Paste JSON and get an instant verdict — valid or broken, with the exact line and column of every syntax error. Strict RFC 8259 checking runs entirely in your browser, so API keys and production payloads never leave your machine. Free, no signup.
Strip every unnecessary byte from your JSON — whitespace, indentation, and line breaks gone in one step, with all values byte-identical. Shrink API payloads, config files, and localStorage blobs before they hit the wire. Free, offline, and instant.
Turn a wall of minified JSON into a beautiful, readable tree — syntax-colored, with collapsible objects and arrays so you can drill into exactly the branch you care about. Built for inspecting real API responses, not toy examples. Free and fully offline.