JSON XML Validator
Online JSON XML validator with syntax checks, error location, and formatted preview for API integration, configuration verification, and debugging workflows.
Validation Mode
Input JSON
Validation Result
Please enter JSON
Guide
Positioning
JSON XML Validator checks syntax validity for two common data formats and shows error positions plus formatted preview, helping teams diagnose issues faster during integration and config maintenance.
Core Features
- Supports instant syntax validation for both JSON and XML modes.
- Shows clear error messages with location hints for quick fixes.
- Provides formatted preview and one-click copy for clean output.
- Includes common error checklist for faster troubleshooting and onboarding.
How To Use
- Select JSON or XML validation mode.
- Paste the text content and trigger validation in real time.
- Fix syntax issues based on error details, or inspect formatted output.
- Copy the formatted result for docs, debugging, or code review.
Use Cases
- Format checks before API request and response integration
- Syntax verification before config file submission
- Troubleshooting log snippets and captured payloads
- Normalizing examples for training and technical documents
Common Errors and Fixes
Common JSON Errors
- Unexpected token near comma, bracket, or quote
- Keys are not wrapped in double quotes (strict JSON)
- Escaping issue in string values such as backslash or quote
- Trailing comma after the last property or array item
Common XML Errors
- Opening and closing tags do not match in nested nodes
- Reserved characters are not escaped, for example &, <, >
- Attribute values are missing single or double quotes
- Malformed XML declaration, namespace, or encoding attribute
FAQ
- Will my data be uploaded: no, validation runs locally in browser.
- Why XML position hints vary: browser parsers expose different error formats.
- Is JSON5 supported: currently only standard JSON is supported.
- Will formatting change meaning: no, it only adjusts layout and indentation.
Privacy
Your JSON and XML content is never uploaded. Validation and formatting run entirely in your current browser session.