# JSON Validator

> Check whether your JSON is valid and find the exact line and column of any syntax error.

URL: https://uttir.com/json-validator
Categories: developer-tools, data-tools
Privacy: Validation runs locally in your browser. Your JSON is never transmitted or stored.

## About

The JSON validator tells you in plain language whether a document is valid JSON, and when it is not, exactly where the first problem is. Instead of a cryptic stack trace you get a friendly message with line and column numbers.

It uses the same parser your browser and most runtimes rely on, so a document that passes here will parse with JSON.parse in JavaScript and equivalent parsers elsewhere.

## How to use

1. **Paste your JSON** — The check runs automatically as you type or paste.
2. **Read the verdict** — A green banner means valid; a red banner shows the error location.
3. **Fix and re-check** — Correct the reported line and column, and the verdict updates instantly.

## Examples

### Trailing comma

A trailing comma after the last property is the most common JSON mistake.

Input:

```
{
  "a": 1,
}
```

Output:

```
Invalid — expected a property name after the comma (line 3).
```

## FAQ

### What makes JSON invalid?

Typical issues: trailing commas, single quotes, unquoted keys, comments, NaN/Infinity, or cut-off documents. JSON is a strict subset of JavaScript object syntax.

### Can it validate large files?

Yes. Parsing runs natively in your browser, so even multi-megabyte documents validate quickly on modern hardware.

### Is my JSON uploaded to a server?

No. Validation happens in your browser using the browser's built-in parser. The text never leaves your device.

## Related tools

- [JSON Formatter](https://uttir.com/json-formatter) — Format, beautify, and validate JSON with adjustable indentation — instantly in your browser.
- [CSV to JSON Converter](https://uttir.com/csv-json-converter) — Convert CSV to JSON and JSON to CSV instantly, right in your browser.
- [JWT Decoder](https://uttir.com/jwt-decoder) — Decode a JWT’s header and payload and check its expiration — without sending it anywhere.
- [JSON-LD Schema Generator](https://uttir.com/json-ld-generator) — Generate valid schema.org JSON-LD structured data for articles, FAQs, organizations, and local businesses.

---

For the full HTML page with the live tool, visit https://uttir.com/json-validator.
This file is the markdown rendering at https://uttir.com/json-validator.md. See https://uttir.com/llms.txt for a site-wide summary.