Lintly.cloud

About JSON Formatter & Validator

Free online JSON formatter and validator. Paste your JSON data to instantly format, beautify, minify, and validate it. Features include syntax highlighting, error detection with line numbers, auto-fix suggestions, tree view, bidirectional mapping, and download support. All processing happens in your browser — your data never leaves your device.

Frequently Asked Questions

How do I format JSON online?

Paste your JSON into the input editor on the left. Lintly.cloud will instantly format and validate it, showing the beautified output on the right with syntax highlighting.

Is my JSON data safe?

Yes. All processing happens entirely in your browser. Your data never leaves your device — no server requests are made.

Can I fix invalid JSON?

Yes. Lintly.cloud detects common JSON errors like missing commas, unquoted keys, and trailing commas, and offers one-click auto-fix suggestions.

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Privacy: This tool runs entirely in your browser. No data is sent to any server. Your input is processed locally using JavaScript and is never stored, logged, or transmitted. Lintly.cloud does not use cookies for tracking and does not require an account.