Checking pasted payloads
Confirm that copied JSON from an API response, config file, or dashboard is valid before you reuse it.
JSON Validator
JSON Validator is for syntax checks. Use it when a payload, config block, or pasted response might be malformed and you need to confirm whether the JSON is valid before you import it, format it, or send it to another system.
Tool interface
What this tool does
JSON Validator helps you check whether JSON is valid and identify parsing issues in the browser for debugging payloads, testing API responses, or reviewing copied configuration data.
Related next steps include JSON Formatter, JSON Minifier, and the Format JSON for API debugging page if you want to keep working on the same task from a different angle.
When to use it
Use it when the question is whether the JSON is valid at all. This page is best for catching syntax errors, misplaced commas, broken quotes, and malformed objects before you format or reuse the payload.
Once the JSON passes validation, the next useful step is often JSON Formatter. If the real goal is debugging an API response, open the Format JSON for API debugging workflow page.
How to use it
Paste or type your input, review the result, and copy or export it once it matches what you need.
- Paste the source input or load the example if you want to see the expected format first.
- Review the output, preview, or validation result carefully.
- Copy, download, or pass the result into the next workflow only after you confirm it matches what you need.
Example
This example shows the kind of input that often fails validation and the feedback you can review before fixing it.
Example input
{"name":"Ana","active":true,}Example output
Invalid JSON: Unexpected token } in JSON at position 28Common use cases
Finding syntax problems
Use it to catch trailing commas, missing quotes, broken brackets, or other syntax errors that stop parsing.
Reviewing import data
It is useful when a form, upload, or integration expects valid JSON and you want to catch issues early.
Formatting valid output next
Once the payload passes, continue with JSON Formatter to make it easier to read.
FAQ
What does JSON Validator do?
JSON Validator helps you check whether JSON is valid and identify parsing issues in the browser for debugging payloads, testing API responses, or reviewing copied configuration data.
When should I use JSON Validator?
Use it when the question is whether the JSON is valid at all. This page is best for catching syntax errors, misplaced commas, broken quotes, and malformed objects before you format or reuse the payload.
How is JSON Validator different from JSON Formatter?
JSON Validator focuses on correctness and error checking. Use JSON Formatter when you need to format JSON with readable spacing and indentation in the browser for reviewing API payloads, debugging responses, or preparing JSON for documentation.
Does JSON Validator run in the browser?
Yes. This tool runs in the browser so you can work with the input on the page without sending it through a custom backend on this site.
What should I use after JSON Validator?
A good next step is JSON Formatter or the Format JSON for API debugging page.
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Open tool pageUse case guides
These workflow pages show where this tool fits inside a real task and which next step usually follows.
Compare with
Use these comparison pages when the job is close enough that the user still needs help choosing between adjacent tools.
Learn more
These topic hubs connect this tool to the wider cluster so users and crawlers can continue into broader informational intent when needed.
Working with this result
Use the output here as a quick browser-side check, then confirm it against your live system or source data if the result will be used in a production workflow.