I Built a Free JSON Formatter (Because Postman's Web UI is Clunky)

Description and use

A browser-based JSON formatter that runs offline, requires no account, and never uploads data.

Problem

Postman's web UI requires an account and uploads JSON to a remote server, posing privacy risks and usability issues for simple formatting tasks.

Outcome

The tool provides a free, private, offline JSON formatting and validation experience, eliminating the need for accounts or server uploads.

Workflow

• Paste raw JSON or drag-and-drop a .json file
• Click "Format" to pretty-print with chosen indent
• Click "Validate" to check syntax and see error locations
• Click "Minify" to collapse JSON to one line
• Use one-click copy to clipboard
• Toggle dark/light theme as needed
• Use offline after first load

Evidence

Your data never leaves your device

Source

Works offline after the first load

Source