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.
When this tool is useful
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. JSON Validator sits in the json & data part of the site, which focuses on format, validate, and convert structured data for development work.
Open it when raw JSON, copied records, or lightweight data transforms are slowing down debugging, QA, or documentation work. Within that group, it leans toward json validation tasks, so the page is tuned for quick single-purpose use rather than a long multi-step workflow. If this step is only part of the job, the most relevant follow-up tools are Json Formatter and Regex Tester.
Before you copy the result
- Validate the structure after processing, especially when the source came from logs, APIs, or spreadsheet exports.
- Compare the first object or row before copying large results into another system.
- If the output is valid but still hard to review, switch to a related comparison or extraction tool next.
Example
A quick example of how this tool works.
Input
Sample input for JSON Validator
Output
Processed output from JSON Validator