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Free JSON Validator

🟢 Runs Locally — verified: your files are processed in this browser. No uploads.

Instantly confirm your JSON is well-formed — precise inline errors point straight at the problem.

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Runs entirely in your browser — paste text and watch the results update instantly. Nothing is uploaded.

100% Client-Side — Your text stays in your browser. Nothing is uploaded.

How to use this tool

  1. 1

    Paste JSON to check

    API payloads, configs, exports — anything you're about to ship.

  2. 2

    Read the verdict

    Valid JSON shows a green status; errors reveal the message inline.

  3. 3

    Fix and re-check

    Edit the input and the verdict updates live.

Key features

InputVerdict
{"ok": true}Valid — no errors
{"ok": tru}Invalid — inline message
Trailing commaRejected (strict JSON)
Empty inputReported as invalid

Privacy: your text never leaves your browser

Every Toolflect Text Tool is 100% client-side. The moment you type or paste text, it is analyzed by JavaScript running inside this browser tab. Your text is never sent to our servers, never stored in a database, and never shared with any third party or AI service. Visit counting (see the note at the foot of this page) is separate from your text and never receives it.

  • No uploads, no accounts, no sign-up
  • Your text is processed locally in your browser and never stored.
  • Works offline once the page has loaded
  • Close the tab and your text is gone from memory

You can even verify it yourself: open your browser's developer tools, switch to the Network tab, and type into the tool — no request ever carries your text. You will also see the Google Analytics request that counts the visit; it carries a page view and never anything you typed, and no cookie or identifier is stored until you accept analytics.

Frequently asked questions

What JSON variant is enforced?
Strict ECMA JSON — trailing commas, comments and unquoted keys are all rejected.
Where does the error point?
The message mirrors the parser's position hint so you can locate the offending character.
Is this the same check other tools use?
Yes — it wraps the standard JSON.parse used by every modern runtime.
Private?
Fully — validation runs locally in your tab.

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