JSON Validator
Validate JSON syntax and get detailed error messages.
💡 Common JSON Issues to Check:
- • Missing quotes around object keys (
{key: "value"}should be{"key": "value"}) - • Trailing commas before closing brackets (
[1, 2,]should be[1, 2]) - • Single quotes instead of double quotes (
'key': 'value'should be"key": "value") - • Unescaped special characters in strings (
"Hello\nWorld"needs escaping) - • Missing commas between array/object elements
About JSON Validator
JSON Validator parses your JSON and reports exactly where any syntax errors occur, including the line number and a description of the problem. This saves time compared to hunting for a missing comma or mismatched bracket by hand. It is a good first step before passing JSON to an API or storing it in a database.
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Frequently Asked Questions
Is JSON Validator free?
Yes, completely free. No signup, no account, no usage limits. Use it as much as you need.
Is my data secure?
All processing happens directly in your browser using JavaScript. Your data is never sent to any server, stored, or shared. It stays entirely on your device.
What is the difference between JSON validation and JSON Schema validation?
JSON validation checks that the text is syntactically correct JSON (proper brackets, quotes, commas, etc.). JSON Schema validation goes further and checks that the data matches an expected shape — for example, that a field is a number and not a string.
Can I validate JSON with comments (JSONC)?
Standard JSON does not allow comments, so JSONC will fail strict validation. Strip the comments first or use a JSONC-aware parser in your project.