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Serialize JSON to well-formed XML — @_ attributes, repeated elements, text nodes and safe tag names.
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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.
Keys starting with the configurable @_ prefix become real XML attributes on their parent element.
Array values emit repeated sibling elements with the same tag — matching xmlToJson exactly for round-trips.
Illegal characters and leading digits in key names are sanitized into valid XML names automatically.
Toggle the <?xml?> prolog and pretty indentation; single-key roots unwrap to avoid a redundant wrapper.
Insert any JSON object — including output from our XML to JSON converter for a perfect round-trip.
Set the root tag, attribute prefix, declaration and pretty-print toggles.
Copy the XML or save it as data.xml for your integration.
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 |
Prefix the key with @_ (configurable): {"book": {"@_id": 1}} becomes <book id="1">.
Each element becomes a repeated sibling tag: {"book": [{...},{...}]} emits two <book> elements.
A #text key becomes the element text content, so xmlToJson output converts back losslessly.
Yes — spaces and illegal characters become underscores and leading digits/dashes get a safe _ prefix.
Attribute values escape & < > " and text nodes escape & < > correctly.