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Paste JSON to validate it instantly. Struct highlights errors inline as you type, with messages like 'Missing comma after line 12' instead of cryptic parser output. The status bar shows validity, line count, and file size at a glance.
Yes. Struct processes everything 100% in your browser. Your data never leaves your device — nothing is sent to any server. Most online tools send your data to their servers for processing. Struct is different: you can verify this by disconnecting your network and confirming the tool still works. Read our privacy policy for full details.
Paste your JSON into Struct's editor. Validation happens automatically in real-time. Errors appear inline with human-readable messages showing exactly what's wrong and where.
Struct detects all syntax errors (missing commas, brackets, quotes) plus structural issues like mixed naming conventions, deeply nested objects, stringified booleans, and duplicate-like keys.
Yes. Struct can auto-fix trailing commas, single-quoted strings, unquoted keys, JavaScript comments, and missing closing brackets. Click 'Fix All' to repair everything at once.