JSON Validator
Paste JSON into the input panel to validate it in the browser. Valid JSON is formatted for readability. Invalid JSON returns a clear error message.
Input
Paste raw JSON here...
Output
Validated and formatted JSON will appear here...
How it works
Paste JSON into the input panel to validate it in the browser. Valid JSON is formatted for readability. Invalid JSON returns a clear error message.
This page runs directly in the browser so users can paste, process, and copy the result without leaving the site.
Common use cases
- Validate payloads before using them in APIs or config files.
- Pretty-print minified JSON for easier review.
- Catch syntax errors quickly when editing structured data.
Frequently asked questions
Does this tool fix invalid JSON automatically?
No. It validates and formats valid JSON, but invalid JSON must be corrected manually.
Is the JSON processed in the browser?
Yes. Validation and formatting happen client-side in your browser.
Related tools
Example
A quick example of how this tool works.
Input
{"name":"Ada","roles":["admin","editor"],"active":true}
Output
{
"name": "Ada",
"roles": [
"admin",
"editor"
],
"active": true
}
How to use
Paste the JSON, click Validate JSON, then read either the formatted result or the error.
- Paste the JSON you want to validate into the input panel.
- Click Validate JSON to check the syntax.
- Use the formatted output if it is valid, or fix the error shown in the status message.
Use cases
This is useful when you are not sure whether the JSON is valid yet.
- Check API payloads before sending them to a request or test tool.
- Validate config snippets before committing them or sharing them.
- Catch syntax mistakes like missing quotes, commas, or braces.
Example
A quick example of how this tool works.
Input
Sample input for JSON Validator
Output
Processed output from JSON Validator