Edit JSON locally in your browser
Many online JSON tools send your paste to a server before formatting or validating it. If the document holds tokens, PII, or internal payloads, that is a risk you may not want. Online JSON Viewer is built so your JSON stays on the device while you view and edit it.
Why local processing matters
Local processing means parse, beautify, minify, search, tree edits, and transforms run in the page with your browser’s JavaScript — not as a round-trip to our servers. You can work on sensitive drafts without creating a copy in someone else’s database. Closing the tab (or clearing the page) drops the in-memory document; we do not keep a server-side history of what you edited.
What stays on your device vs AdSense
- Your JSON — paste, type, or open a file from your machine. The app does not upload, transmit, or store that document on our servers. Downloads save to your device via the browser.
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UI preferences — settings such as wrap text or dark
mode may live in
localStorageon your device only. Those values are not your JSON content. - Ads (Google AdSense) — the site may show ads. Google and partners can load third-party scripts and set cookies for ad delivery and measurement. That is separate from processing your JSON. See the Privacy Policy for full detail.
How to paste, edit, transform, and download
- Open the viewer and paste JSON into the left editor, or load a local file.
- When the document parses, use the tree on the right. Beautify or minify in the toolbar; both rewrite text locally.
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Double-click a primitive to edit inline. On an array or object, open
Transformfor recipes (or Advanced JS), preview, then apply. UseRevert last changeif you need to undo. - Search keys or values in the tree when you need to find a path — search highlights matches; it does not rewrite the document.
- Download when you want a file on disk. Sharing that file is outside this tool.
For syntax problems that block the tree, see Fix invalid JSON. Privacy wording that matches this guide lives in the Privacy Policy.