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Show HN: Fast, secure JSON Formatter with side-by-side JSON diffing

instantjsonformatter.com7 points2 comments
Screenshot of Show HN: Fast, secure JSON Formatter with side-by-side JSON diffing

InstantJSONFormatter is a browser-first toolkit for working with JSON that performs formatting, validation, minification, viewing and side-by-side diffs entirely on the client. It accepts pasted input, drag-and-drop or file upload and offers beautify, auto-fix, key sorting, preview of original vs formatted, and a collapsible JSON viewer. The interface is keyboard-friendly (common shortcuts like Ctrl+Enter for format), responsive from mobile to 4K, supports dark/system themes, highlights parsing errors with exact line and column, and streams files up to 10 MB without freezing. It also includes converters and generators (JSON→YAML/XML/CSV/SQL/TypeScript and JSON Schema).

The tool emphasizes privacy and speed: all parsing and transformations run in-browser with no server calls, tracking, cookies, signups or uploads, and claims near-instant formatting. It compares itself against "standard" online formatters by stressing local execution, no ad intrusions, WCAG accessibility readiness, and minimal bundle size; the project is MIT-licensed and open source. Practical details include download/upload shortcuts, offline operation after page load, guidance for malformed JSON correction, and a status bar that notes optimization for larger files. It’s positioned as a lightweight, secure alternative for developers who repeatedly process JSON.

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