JSON Validator
JSON & Data Format · Free Online Tool
Validate JSON syntax and highlight error positions.
{
"name": "Alice",
"age": 30,
"skills": [
"JavaScript",
"Python"
],
"active": true
}Live Check
Validates on every keystroke — instant feedback.
Pinpoint Errors
Highlights the exact line and column of syntax issues.
Pretty Preview
Valid input is reformatted so you can confirm structure at a glance.
How to Use JSON Validator
- 1Paste your input data (JSON, CSV, XML, YAML, etc.) into the input field.
- 2The tool automatically processes and validates your data.
- 3Review the converted output in the result panel.
- 4Copy or download the converted result.
Features
- ✓100% free — no signup, no subscription, no ads
- ✓Runs entirely in your browser — data never leaves your device
- ✓Fast and lightweight — instant results
- ✓Cross-platform — works on desktop, tablet, and mobile
Frequently Asked Questions
Can I convert large JSON files?
Yes, but performance depends on your browser. Files up to 10MB are generally handled well.
Do you validate the input?
Yes, most tools validate input and show error messages with line numbers for invalid data.
Can I download the converted result?
Yes, most conversion tools provide a download button for the output file.
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