JSON Validator Online - Free & Local

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What is JSON Validator?

JSON Validator is a free ComTools utility that validate json syntax with error location. Data is processed locally in your browser; nothing is uploaded.

Features

Free to use
No signup required
Local processing
Data is processed locally in your browser; nothing is uploaded.
Bilingual UI
Chinese and English supported
Developer friendly
Validate JSON syntax with error location

Use cases

Daily development
Data conversion
Learning and demos
Quick format checks

How to use

Open the tool page
Enter or upload your data
Click the action button
Copy or download the result

FAQ

QIs my data uploaded?

Data is processed locally in your browser; nothing is uploaded.

QIs it free?

Yes, completely free with no usage limits.

QWhich browsers are supported?

Modern browsers: Chrome, Edge, Firefox, Safari.

QHow to report issues?

Use the Messages page for feedback or custom requests.