How to use it
- Paste JSON/JSONC or load a file, URL or CSV/XLSX.
- Fix errors, format the document or edit values in the tree.
- Copy the result or download it as UTF-8 JSON.
Runs locally in your browser
Online JSON editor
Free JSON editor with syntax highlighting, data tree, search, validation and safe repair. Format and minify JSON locally in your browser.
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A practical JSON editor that keeps data private
Use the editor for API responses, configuration files and nested structures. Text mode is convenient for quick changes, while the tree helps you edit keys, values and JSON types safely.
Validation points to syntax errors. Common issues can be repaired with a preview first, so your original text is never replaced without an explicit action.
- Text and tree as tabs
- JSONC: comments in JSON
- Import file, URL, CSV/XLSX
- Local file processing
Frequently asked questions
Is my JSON uploaded?+
No. Parsing, editing and formatting happen in your browser. Document contents are not put in URLs or stored on the application server.
Can it repair trailing commas and single quotes?+
Yes. Repair handles common mistakes and shows the proposed result first. Complex documents may still require manual fixes.
How is formatting different from minification?+
Formatting adds indentation and line breaks for readability. Minification removes insignificant whitespace to reduce size. Neither operation changes the data.