Format Converter
ConvertersConvert between JSON, YAML, XML, TOML, ENV, Markdown and NDJSON bidirectionally — instantly in your browser. Swap direction with one click. No upload, no account, 100% client-side.
JSONjson
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YAMLyaml
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Input: 206 chars
About Format Converter
A single tool for all your bidirectional data format conversions. Paste your source, pick the target format, and get the converted output instantly — with syntax highlighting and one-click direction swapping. All processing happens in your browser using well-tested libraries.
Features
- ✓JSON ↔ YAML — fully round-trip preserving comments hints and multi-line scalars
- ✓JSON ↔ XML — configurable attribute prefix, array wrapping and pretty-print indentation
- ✓JSON ↔ TOML — handles nested tables, inline tables, arrays of tables and date values
- ✓JSON ↔ ENV — bidirectional .env key=value file conversion with nested key flattening
- ✓JSON → Markdown Table — generates GFM-compatible tables from arrays of objects
- ✓JSON ↔ NDJSON — line-by-line newline-delimited JSON split and join
- ✓One-click direction swap — reverse source and target without copy-pasting
- ✓Syntax highlighted input and output with CodeMirror editor
- ✓Error reporting — inline parse errors pinpointing exactly what went wrong
- ✓Runs 100% in the browser — nothing uploaded, no account required
Common Use Cases
- Convert a package.json or tsconfig.json snippet to YAML for a CI config file
- Transform an OpenAPI YAML spec to JSON for tooling that requires JSON input
- Convert a .env file to JSON for use in a configuration object or test fixture
- Turn an XML API response into JSON for easier JavaScript processing
- Generate a Markdown summary table from a JSON array of objects for documentation
- Split a large NDJSON log file into individual JSON objects for debugging
- Convert Cargo.toml or pyproject.toml data to JSON for programmatic processing
Frequently Asked Questions
QIs my data sent to a server?
No. All conversions run entirely in your browser using JavaScript libraries. Your data never leaves your device.
QWhich direction of conversion is supported?
All pairs are fully bidirectional — you can swap source and target formats with a single click. Not all pairs are losslessly round-trippable (e.g. XML attributes have no direct JSON equivalent), but the converter handles the most common cases correctly.
QCan I convert large files?
Yes. The converter is limited only by your browser's available memory. For very large files (tens of MB) the conversion may take a moment, but there is no artificial size limit.
QWhat happens to YAML comments during conversion?
YAML comments are not part of the JSON data model and are lost when converting YAML → JSON. They are preserved in the raw YAML input but cannot round-trip through JSON.
QDoes the TOML converter support TOML v1.0?
Yes. The converter uses a TOML v1.0-compliant library and correctly handles dotted keys, multi-line strings, local dates and times, and all array/table variants.
See Also
- JSON → YAMLConvert a JSON document into YAML format
- YAML → JSONConvert a YAML document back into JSON
- JSON → XMLWrap JSON data in XML elements
- JSON → TOMLConvert a JSON config to TOML format
- JSON FormatterFormat and syntax-highlight JSON with collapsible tree view
- YAML FormatterLint and pretty-print YAML documents
- XML FormatterIndent and validate XML markup