Input JSON
Showing
Node Details
Select a node to view details
Format, validate, and explore JSON — 100% client-side, private by design
Select a node to view details
Format, validate, and explore JSON — 100% client-side, private by design
Paste XML, get clean JSON — attributes, repeated elements and text nodes handled correctly
Turn CSV rows into JSON arrays of objects — quoted fields, custom delimiters and types handled for you
Flatten nested JSON into clean CSV columns — download Excel-ready .csv files in one click
Compress JSON to a single line and watch exactly how many bytes you save
Compare two JSON documents semantically — key order and whitespace never count as differences
Escape JSON strings for embedding — or unescape stringified logs back into readable JSON
One-click repair for broken JSON, JSON5, JS objects, Python dicts and truncated LLM output.
Turn any JSON payload into clean TypeScript interfaces or type aliases — merge arrays, detect optional fields and unions.
Parse YAML configs — K8s, Docker Compose, GitHub Actions — into clean JSON, then explore and edit visually.
Generate clean, idiomatic YAML from any JSON — smart string quoting, compact list style, 2 or 4 space indent.
Serialize JSON to well-formed XML — @_ attributes, repeated elements, text nodes and safe tag names.
Infer a standards-compliant JSON Schema from example data — formats, required keys, unions and additionalProperties control.
Query any JSON with live JSONPath evaluation — wildcards, recursive descent, slices and filters, all in your browser.
Live JSON validation with instant error feedback as you type — your text is never rewritten mid-typing, and errors point to the exact line and column.
Switch between highlighted text, an interactive tree, and a real table view for arrays of objects — perfect for inspecting API responses.
Find any key or value instantly, and copy a node's standard JSONPath (like $.store.book[0].title) with one click.
Pasted XML or CSV by accident? The tool detects it and offers a one-click conversion to JSON, plus a link to the dedicated converter.
Copy your JSON data and paste it into the input field, or drag and drop a JSON file directly onto the editor.
Click "Format" (or press Cmd/Ctrl+Enter) to format, validate, and beautify your JSON. Use "Minify" to compress it to a single line.
Explore data in tree or table view, search for keys, copy JSONPath expressions, and edit values inline in the details panel.
How formatjson.net compares to traditional server-based JSON formatters and converters
| Capability / Standard | formatjson.net (Client-Side Workbench) | Traditional Server-Based Tools |
|---|---|---|
| Data Processing & Privacy | 100% local in-browser JavaScript — payloads never leave your device | Often uploads JSON/XML/CSV to remote backend servers |
| Confidential API Keys, JWTs & PII | Safe by design — zero network transmission, works offline via Service Worker | Risk of server access logs or third-party data retention |
| Broken & Truncated LLM JSON Repair | 1-click lexical state machine fixes comments, single quotes, trailing commas, Python literals & unclosed brackets | Fails with syntax error on non-strict JSON |
| 64-Bit Snowflake IDs & Leading Zeros | Preserves unsafe integers (> 2^53 - 1) and leading-zero codes ("00123") without precision loss | Silently truncates 64-bit IDs or strips leading zeros |
| Deep Nested Array Exploration | Interactive spreadsheet drill-down ([n items] →) with breadcrumbs, 3-state sorting & inline cell editing | Flat root-only tables or read-only trees |
| Large File Responsiveness | Chunked lazy tree (200 nodes/batch) + paginated table + 150 KB highlight guard | Main-thread DOM freeze on multi-megabyte files |
JSON formatting (also called beautifying or pretty-printing) adds indentation and line breaks to raw JSON so it is easy for humans to read. Minified JSON is great for machines, but almost impossible to debug by eye — formatting makes the structure visible without changing the data.
Yes. All formatting, validation, and editing happen entirely in your browser with plain JavaScript. Your JSON is never uploaded to a server, so it is safe to paste sensitive API responses, tokens, or configuration.
Paste your JSON into the input panel — the validator reports the exact parse error and can jump to the precise line and column. The most common issues are trailing commas, single quotes instead of double quotes, unquoted keys, and comments (which JSON does not allow).
Yes. Click any node in the tree view to open the details panel, then edit primitive values (strings, numbers, booleans, null) inline. The input JSON, tree, and table all update automatically.
Very large. The tree view renders nodes lazily — only expanded branches are added to the page in chunks of 200 — and the table view paginates rows, so multi-megabyte files stay responsive. You can also drop a .json file directly onto the input area.