Common Invalid JSON in JSON

From the JSON cheat sheet · Validation and Security · verified Aug 2026

Recognize syntax accepted by JavaScript but not JSON.

json

Invalid:
{'name':'Ana'}
{"active":True}
{"items":[1,2,]}

📌 JSON is stricter than JavaScript object syntax

⚠️ Comments are not part of RFC 8259

💡 Use a parser instead of visual inspection

🎯 Return useful validation errors without leaking data

validationinvalid-jsonpitfalls

Continue with JSON

Save the full cheat sheet or work through every related task.

More JSON tasks