JSON Validator
Use this JSON Validator to get fast and reliable results with a clear workflow and practical guidance.
100% Client-Side Processing
All processing happens in your browser. Your input is not uploaded to a server.
Common JSON Errors
❌ Trailing Commas
JSON doesn't allow commas after the last item in objects or arrays.
{
"key": "value",
}❌ Unquoted Keys
All object keys must be wrapped in double quotes.
{
key: "value"
}❌ Single Quotes
JSON only supports double quotes for strings.
{
"key": 'value'
}❌ Comments
JSON doesn't support comments (unlike JavaScript).
{
// This is a comment
"key": "value"
}Table of Contents
What is this tool?
JSON Validator helps you complete this task quickly and consistently without switching between multiple apps.
It is designed for day-to-day use with clear inputs, practical outputs, and a straightforward user experience.
How it works
- Enter or paste your input data in the fields provided.
- Adjust options to match your use case and preferred output format.
- Review the generated result and copy it for your workflow.
Best practices
- Use realistic sample data first to verify your settings.
- Double-check critical values before sharing or publishing results.
- Save final outputs in your project docs for repeatable workflows.
Frequently asked questions
Yes. You can use this tool directly in your browser at no cost.
Yes. Inputs are processed locally in your browser and are not sent to a server.
Yes. The tool is designed to work on both desktop and mobile browsers.