JSON Formatter & Validator
Validate, format and minify JSON instantly.
"Fix common issues" repairs things like trailing commas — explicitly, never silently. The original is never modified without this button.
Working…
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Fill in the input above and run the tool to get started.
Honest limits
Error messages come from the parser and can be cryptic — the tool translates the common ones into plain language.
How to use the JSON Formatter & Validator
- Paste JSON (or open a
.jsonfile) — validation runs as you type. - Pick a mode: Beautify, Minify, Validate, or the collapsible Tree view.
- If the JSON is invalid, the error panel pinpoints the exact line and column. Use "Fix common issues" for trailing commas and similar slips.
Examples
Example
Paste {"a":1,"b":[2,3],} → the tool flags the trailing comma at line 1, column 21. Press Fix common issues → clean, beautified JSON.
What this tool doesn't do
- Validates syntax only — it cannot check your JSON against a remote schema or API contract.
- Duplicate keys: per the JSON spec, the last value wins — the tool warns you rather than guessing.
- Fixes are explicit (button press), never silent — review the diff before trusting the output.
Frequently asked questions
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