Format and explore JSON
Paste JSON on the left to format, validate, query, and visualise — all in your browser, nothing sent anywhere.
A full JSON workspace: format, minify, validate, sort, repair, and explore. The editor supports overlay-style syntax highlighting that stays sub-frame for inputs up to ~100KB, then degrades gracefully for multi-MB pastes. Four view modes — Code, Tree, Table, Graph — let you pick the right lens for the document at hand. JSONPath queries, fuzzy search, structural diff, and ten output formats round out the tool.
Common use cases
- Debugging an API response. Paste the raw response, validate it, and use Tree view to drill into the shape. JSONPath quickly extracts specific values without manual navigation.
- Cleaning up minified JSON from network tools. Copy a long single-line JSON blob from DevTools / Postman / curl output, paste it here for instant pretty-printing with line numbers.
- Repairing broken JSON from LLM output. Use the Repair feature to fix trailing commas, single quotes, unquoted keys, and other near-miss invalidities that JSON.parse would reject.
- Comparing two API responses. Drop both into the Diff view to see exactly what changed — added, removed, and changed keys, with structural awareness rather than line-by-line text diff.
- Converting between formats. One-click conversion to YAML, CSV, XML, JSON Schema, or directly to TypeScript / Go / Python / Rust / Zod types from the Convert dropdown.
Frequently asked
Does my JSON leave my browser?
No. The entire tool runs client-side. No network calls, no telemetry on input contents, nothing leaves your device. Safe to use with sensitive payloads, internal API responses, or production data.
Why does the formatter feel slow on huge inputs?
Above ~100KB the syntax highlighter degrades to plain text to keep keystrokes responsive. Above ~1MB the parser also runs in a Web Worker. You may still see a moment of pause on the initial load — but typing should stay smooth.
What does the Repair feature do?
Fixes common near-miss invalidities: trailing commas, single-quoted strings, unquoted keys, JavaScript-style comments. Useful for JSON5 / JSONC files and LLM-generated output. It's lossless — the repair preview shows exactly what was changed.
Can I share a formatted document?
Click the share icon to generate a URL with the document encoded as a hash fragment. Hash fragments aren't sent in HTTP requests, so the contents stay between sender and receiver.
What's the difference between Tree, Table, and Graph views?
Tree: collapsible hierarchical view, best for deeply nested objects. Table: each row is an array item, each column a key — best for array-of-records data. Graph: SVG node-and-edge visualization of structure, best for understanding relationships in unfamiliar documents.
How does JSONPath search work?
Standard JSONPath syntax: `$.users[*].name` to extract all user names, `$..email` to find every `email` field at any depth. Hit Enter in the search panel and matching paths are highlighted in the editor.
Can I sort keys?
Yes — use the Sort dropdown for ascending / descending key sort. Useful for diff-friendly check-ins and canonical JSON.