Developer Browser-based

JSON Validator

Validate JSON and find syntax errors instantly in your browser.

This tool runs in your browser. Your input is processed locally and is not uploaded.
Paste JSON and validate it.

How to use JSON Validator

Use JSON Validator when you need a quick developer utility without installing software or creating an account. Enter your values or text in the tool above, review the instant result, then copy or save the output when the tool supports it.

  • Works directly in a modern browser on desktop or mobile.
  • Designed for fast repeat use from the root URL /json-validator.
  • Input stays in your browser unless a tool clearly says otherwise.

Features

  • Validate JSON syntax
  • Show parsing errors
  • Format valid JSON
  • Works locally in browser

Use Cases

  • Check API responses
  • Fix JSON config files
  • Validate structured data

JSON Formatter

Format, minify, and validate JSON data. See clear error messages with line numbers.

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CSV to JSON Converter

Convert CSV rows into formatted JSON locally.

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Generate SHA hashes from text using your browser crypto API.

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Frequently Asked Questions

Is this tool free?

Yes. This RunX tool is free to use in your browser.

Does this tool upload my data?

No. The tool runs in your browser and does not send your input to a server.

Can I use it on mobile?

Yes. The interface is responsive and works on modern mobile browsers.