Developer Tools31 May 2026·4 min read
How to Format and Validate JSON Online
Learn to pretty-print, minify, and validate JSON in your browser with NxtTls — no signup, no server uploads.
JSON is everywhere — APIs, config files, and mobile app payloads. Raw JSON is hard to read when it arrives minified on one line. NxtTls JSON Formatter runs entirely in your browser, so your data never leaves your device.
Format vs minify vs validate
Use Format to add indentation and line breaks for debugging. Use Minify before sending JSON over the network to reduce size. Use Validate to catch syntax errors before they break your pipeline — you'll see the exact error message if a comma or bracket is wrong.
Keyboard shortcut
Press Ctrl+Enter (Cmd+Enter on Mac) to format instantly. Copy the output with one click when you're done.
Try the tool
JSON Formatter