Developer Data Tool
Local JSON Editor & Diff
Paste API responses, config files, or log payloads, then format, validate, minify, sort keys, compare JSON, or generate a TypeScript interface locally in your browser.
Original JSON
Paste JSON to begin.
Local JSON editor for API debugging
This JSON editor is built for developers who need a fast JSON formatter, JSON validator, JSON diff tool, and local JSON editor while debugging API responses. Paste JSON from an endpoint, webhook, log, feature flag, package file, or application config, then inspect a readable tree view without sending data to a server.
Use Diff mode to compare JSON online, spot changed paths, and review added or removed values. The formatter, minifier, key sorter, copy action, JSON download, and TypeScript interface generator all run inside your browser tab.
Private developer workflow
All JSON is processed locally in your browser. API payloads, tokens, customer records, and debugging data are not uploaded.