Common JSON errors fixed
- 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
- Missing commas between items
- Invalid escape sequences
Developer Tools
JSON Formatter Toolkit
Format, validate, beautify, minify, and convert JSON data. Best for developers and everyday users.
Runs in your browser
No login required
Copy / download output
Premium workflow
⚡
Fast workflow
Add your input and get a usable result quickly.
⌘
Practical controls
Only the options you need, with readable output.
🛡
Runs in your browser
Built with safer defaults and clear actions.
⬇
Copy or download
Use the result in your project, website, file, or report.
Ln 1, Col 10 characters
Ln 1, Col 10 characters
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 details.
- Repair, format or minify depending on your workflow.
- Use tree, stats, convert or diff for advanced insights.
Browser-side privacy
Error line highlight
Tree view
JSONPath copy
Sample presets
Who is this tool for?
- Developers and backend engineers
- API testers and QA engineers
- Students and learners
- Technical writers and documenters
- Anyone working with JSON data
Related JSON tasks
Do more with the same data.
- Convert JSON to CSV, YAML, XML
- Extract values with JSONPath
- Compare JSON documents
- Generate TypeScript interfaces