JSON validator
Check JSON syntax and see a helpful error when it is invalid.
Enter text to get started.
Converting your file
Working on your device…
What this tool does
Check JSON syntax and see a helpful error when it is invalid.
Select a supported file or paste text.
Use the options shown in the workspace.
Download the result and review it on your device.
When to use json validator
Locate a JSON syntax error before using the data.
How to use json validator
- Paste the text or data into this tool’s input.
- Review the json validator options shown above.
- Run the tool and inspect the result before copying it.
Frequently asked questions
How does JSON validator work?
Choose the input, adjust any available options, and run the tool. Check JSON syntax and see a helpful error when it is invalid.
Is my file uploaded to ConvertExpress?
No. This demo performs this conversion in your browser. The site downloads its interface and code, but it does not upload the selected file for this tool.
Will the output always match the original?
Check JSON syntax and see a helpful error when it is invalid. Check the result before using it for important work.
Does valid JSON mean my data matches an API schema?
No. This tool checks JSON syntax. It does not verify required business fields, field types, or a separate JSON Schema.