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.