json formatter & validator

Paste your raw JSON to format, pretty print, and validate it.

How It Works

1. Paste Your JSON

Enter your raw JSON data into the text area.

2. Format & Validate

Click the button to instantly format and validate your JSON.

3. Copy Result

Copy the pretty-printed JSON or view validation errors.

Why Use OnlineTinker's JSON Formatter?

Our free online JSON Formatter and Validator is an indispensable tool for developers, data analysts, and anyone working with JSON data. It helps you quickly make sense of complex JSON structures, identify errors, and ensure data integrity. It's fast, private, and easy to use:

  • Pretty Print: Formats messy JSON into a readable, indented structure.
  • Instant Validation: Quickly checks for syntax errors and invalid JSON.
  • Completely Free: No costs, no subscriptions, no limits.
  • Privacy-Focused: Your data is processed on the fly and not stored.

Perfect For:

  • Developers: Debug API responses, configure applications, or manage data.
  • Data Scientists: Clean and inspect JSON datasets.
  • Testers: Validate JSON payloads in API testing.
  • Anyone working with JSON: Quickly understand and verify JSON structures.

Frequently Asked Questions (FAQs)

What is JSON?

JSON (JavaScript Object Notation) is a lightweight data-interchange format. It is easy for humans to read and write and easy for machines to parse and generate.

How does this tool validate JSON?

The tool attempts to parse your input as JSON. If successful, it's valid. If not, it provides an error message indicating where the syntax issue might be.

Is this tool free to use?

Yes, our JSON Formatter and Validator is completely free to use, with no hidden costs or subscriptions.

Do I need to install any software?

No, our tool is entirely web-based. You can access it directly from your browser on any device without needing to download or install anything.