Common JSON errors fixed faster
- Trailing commas after the last item
- Single quotes instead of double quotes
- Unquoted object keys copied from JavaScript
- Comments pasted from config files or examples
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Developer Tools
JSON Formatter
Format, validate, repair, minify, compare and convert JSON in one clean browser workspace.
Runs in browser
No login required
Copy / download output
Privacy-friendly workflow
JSON toolkit
JSON Formatter Toolkit
Format, validate, repair, minify, compare and convert JSON in one clean browser-based workspace.
Private by design: your JSON is processed in your browser. Nothing is uploaded or stored by this tool.
Format or validate JSON to see an expandable tree view.
Validation errors will appear here with line and column details.
JSON size, keys, value types and depth will appear here after validation.
Compare JSON
JSON Diff Checker
Paste two JSON documents to compare formatted output and spot added, removed or changed lines.
Diff result will appear here...
How to use this tool
Clean JSON in a few clicks
- Paste or upload JSON into the input editor.
- Validate to see errors with highlighted line, line number and column details.
- Repair, format or minify depending on your workflow.
- Use tree, stats, convert or diff when working with larger API data.
Browser-side privacy
Error line highlight
Tree actions
JSONPath copy
Sample presets
Best for developers and everyday users
Use this page for API responses, webhook payloads, WordPress settings, app config, AI-generated JSON, logs and structured data snippets.
Related JSON tasks
After formatting, you can convert JSON to CSV, YAML, XML, TypeScript, query strings or HTML table markup from the same workspace.
How it works
Simple workflow
- Paste or type your input.
- Choose the action or option you need.
- Copy or download the result.