Check JSON or XML for Errors | Free Validator & Formatter
Validate JSON or XML online with instant error highlighting, beautify/minify, copy or download results, and keep data private with in-browser processing.
Validate and format JSON with instant syntax checks, line-level feedback, and in-browser processing.
Validate XML for well-formed markup, format output, and catch structural issues before export or import.
- Instant JSON and XML syntax checks with readable error messages.
- Format or minify content before copying or downloading the result.
- Browser-only processing keeps API payloads and config files private.
- Useful for API debugging, CMS imports, SOAP payloads, and config validation.
How This Validator Helps
Fast Feedback
See malformed JSON or XML immediately instead of testing broken payloads downstream.
Cleaner Formatting
Beautify payloads for review, or minify JSON when you need compact output.
Private by Default
All parsing runs locally in your browser, so nothing needs to be uploaded.
Typical Use Cases
Use the JSON tab to inspect API responses, config files, and request bodies. Switch to XML when checking SOAP payloads, feeds, sitemap fragments, or import/export documents that need to be well formed before another system will accept them.
If you also need encoding tools, use our Text & Code Converter.