JSON Formatter
ConverterBeautify, minify and validate JSON data with syntax error detection. Catch malformed brackets and commas before they break your API integration.
About JSON Formatter
JSON (JavaScript Object Notation) is the most widely used data exchange format in modern web communication. This tool is a professional JSON Studio: a code editor with syntax highlighting, line numbers, bracket matching and code folding, supporting formatting (pretty-print), minification, validation, key sorting, escape/unescape, plus real-time JSONPath queries. On syntax errors it pinpoints the exact line and column with a plain-language hint. All processing happens in your browser — your data never leaves your machine, so it's safe to paste sensitive API responses, config files, or log data. Tip: Bookmark this tool for quick access whenever you need format conversion. All processing happens locally in your browser — no data upload, so feel free to paste sensitive content.
How to Use
- Open the JSON Formatter tool
- Paste or type your JSON data in the left editor
- Click 'Beautify' to format the JSON or 'Minify' to compress it
- Review the structured data with syntax highlighting and line numbers
- Copy the formatted JSON or download it as a file
Use Cases
- Debug API responses — Pretty-print flat backend JSON into a highlighted, readable structure; on errors it pinpoints the exact line and column.
- Extract with JSONPath — Use expressions like $.data.users[0].name to filter output in real time and pull target data from large responses.
- Validate config files — Check syntax of package.json, tsconfig.json and other configs with error-line highlighting before deployment.
- Reduce transfer size — Minify formatted JSON into a single line to reduce network payload — typically 20-50% smaller.
- Sort and escape — Sort keys with one click for easier diffing, or JSON-escape/unescape string content.
- Share data snippets — Compress the current JSON into a share URL — no server upload, just send the link to a colleague.
- Schema comparison — Format two JSON objects side by side to quickly spot structural differences in API responses or config files.
- Large file inspection — Collapse deeply nested nodes in the tree view to navigate massive JSON responses without scrolling endlessly.
FAQ
Can it pinpoint the error line?
Yes. On a parse failure the editor highlights the offending line and shows "line X, column Y" with a plain-language hint (missing comma, unquoted property, etc.), so no manual character hunting.
How do JSONPath queries work?
Type an expression like $.config.theme or $.tags[*] in the query bar; the output shows matches and a hit count in real time, with wildcards, recursive descent and filter expressions.
How large a JSON can it handle?
Built on the CodeMirror editor, it edits multi-MB JSON smoothly. For log-sized files, pre-process with a command-line tool like jq first.
Does it support JSON5 / JSONC?
No. This tool only handles strict JSON. For comments or single-quoted syntax, convert to standard JSON first.
Does the share link upload my data?
No. Sharing LZ-compresses the data into the URL hash fragment, so the data stays in the link itself and never hits a server.
How do I convert to YAML or TOML?
Use our Data Format Converter or the JSON to YAML / JSON to TOML tools for lossless multi-format conversion.
Any browser compatibility requirements?
This tool works in all modern browsers (Chrome, Firefox, Edge, Safari). No plugins or extensions required.
Can I use it offline?
After initial load, most features work offline. The core logic runs entirely in your browser with no network dependency.
Comments
Comments are stored locally in your browser. Configure Giscus for cloud-based comments.