The JSON toolwith no pasted-content upload.Prove it yourself.
Format, validate, and debug pasted JSON in a browser-local workflow.Open DevTools -> Network. You can verify pasted content is not uploaded during core tool use. That's the whole point.
Formatter and Beautifier are tested with 50MB JSON for local parsing. No pasted-content upload for this workflow.
In November 2025, popular online JSON tools were caught leaking over 80,000 credentials, including AWS keys, GitHub tokens, and bank details. SafeJSON keeps core JSON workflows browser-local and verifiable. Open DevTools -> Network, format once -> no pasted JSON in request URLs or bodies.
Handles files locally in your browser - no pasted-content upload.
Why developers choose SafeJSON
Verify, don't trust
We don't ask you to trust us. Open DevTools -> Network tab -> paste any JSON. Core tools avoid pasted-content upload requests for their inputs.
Instant Results
No loading spinners. No waiting. Paste your JSON and see formatted output immediately.
Built for Developers
Tree view with collapsible nodes, error location with line numbers, dark mode, keyboard shortcuts. No clutter, no ads.
Open Source
The entire codebase is on GitHub. You can audit every line. No obfuscated data-collection scripts. No surprises.
Free Forever
Core formatting, validation, and tree view are always free. Advanced tools like JSON diff, JWT decoder, JSONPath, and Schema are optional Pro features.
Browser Extension
Auto-detect and format JSON responses on any URL. Available on Edge Add-ons. The extension no longer sends page JSON through URL parameters.
More than a formatter
Advanced tools for developers who work with JSON every day. Built around verifiable browser-local workflows.
JSON Diff
Compare API responses, webhook payloads, and config snapshots in a browser-local workflow. No pasted-content upload for diff input.
JWT Decoder
Decode JWT headers and claims in the browser. Do not paste production secrets unless your policy allows local inspection.
JSONPath
Query nested API responses and logs in a browser-local workflow with XPath-like expressions.
Schema Validator
Validate JSON against schemas in the browser. Error paths and messages are generated locally for pasted input.