Convert between JSON, YAML, CSV, and XML formats instantly. Free browser-based tool with bidirectional conversion, no registration required.
Paste your data into the input panel — JSON, YAML, CSV, or XML.
Select the target format using the conversion buttons (e.g., JSON → YAML).
The converted output appears instantly in the output panel.
Click Copy to clipboard or Download to save the converted file.
Convert JSON → YAML, JSON → CSV, JSON → XML, and the reverse: YAML → JSON, CSV → JSON, XML → JSON.
Properly flattens nested objects to dot-notation in CSV, preserves hierarchy in YAML and XML conversions.
All conversions run locally in your browser with zero server communication. Your data never leaves your device.
One-click copy to clipboard or download the converted output as a file with the correct extension.
Configuration files, API responses, and database exports often contain tokens, credentials, or personal information. Because every conversion runs entirely in your browser, your data is never transmitted to any server. There is zero risk of interception, logging, or retention by third parties. Convert production configs and sensitive payloads with confidence.
Instead of searching for separate JSON-to-YAML, JSON-to-CSV, and JSON-to-XML converters, this tool handles all six directions in a single interface. Switch between formats instantly without copy-pasting between different websites. This saves time and reduces the risk of data corruption from multiple tool hops.
Converting between hierarchical formats (JSON, YAML, XML) and flat formats (CSV) requires careful handling of nested structures. This tool automatically flattens nested objects using dot notation for CSV headers (e.g., address.city) and reconstructs them when converting back. Arrays, null values, and mixed types are all handled correctly.
Start converting immediately — no account required, no daily caps, no file size restrictions. Whether you are converting a 5-line config snippet or a 10,000-row CSV dataset, the tool processes everything locally without throttling. There are no premium tiers or feature locks.
Modern software development uses multiple data serialization formats, each optimized for different use cases. Understanding when and how to convert between JSON, YAML, CSV, and XML is essential for developers working with APIs, configuration systems, databases, and data pipelines.
JSON (JavaScript Object Notation) is the dominant format for web APIs, NoSQL databases, and application configuration. Its strengths are simplicity, widespread language support, and native compatibility with JavaScript. JSON supports objects, arrays, strings, numbers, booleans, and null — but not comments, dates, or binary data natively.
YAML (YAML Ain't Markup Language) is designed for human readability. It uses indentation instead of brackets, supports comments, and handles multiline strings elegantly. YAML is the standard format for Kubernetes manifests, Docker Compose files, CI/CD pipelines (GitHub Actions, GitLab CI), and Ansible playbooks. Converting between JSON and YAML is lossless for all data types.
CSV (Comma-Separated Values) is the universal format for tabular data — spreadsheets, database exports, data science workflows, and ETL pipelines. CSV is inherently flat: it cannot natively represent nested objects or arrays. Converting JSON to CSV requires flattening nested structures using dot notation (e.g., user.address.city) and serializing arrays as JSON strings within cells. Converting back requires reversing this process.
XML (eXtensible Markup Language) dominated enterprise integration before JSON. It remains essential in SOAP web services, healthcare (HL7 CDA, FHIR), financial systems (FIX, SWIFT), and document formats (DOCX, SVG). XML supports attributes, namespaces, and schemas (XSD) that have no direct JSON equivalent. Converting between JSON and XML requires mapping conventions — typically elements for object keys and repeated <item> elements for arrays.
true could be a boolean or a string.Always validate the output after conversion, especially for CSV (check that nested structures were flattened correctly) and XML (verify element naming). Use round-trip tests to ensure no data loss. When converting for production use, prefer JSON ↔ YAML (lossless) over JSON ↔ CSV or JSON ↔ XML (potentially lossy). Document your flattening conventions when sharing CSV files derived from nested JSON.
Selecting the appropriate data format depends on the consumer, the transport layer, and the data structure. Use JSON when building web APIs, JavaScript applications, or NoSQL databases — it is the native data format of the web and offers the best tooling ecosystem. Choose YAML for configuration files that humans will read and edit frequently, especially in DevOps contexts like Kubernetes, Docker Compose, and CI/CD pipelines. Use CSV when exchanging tabular data with spreadsheet applications, business intelligence tools, or data science libraries like pandas. Choose XML when integrating with enterprise systems, SOAP services, or industry-specific standards like HL7 in healthcare or SWIFT in finance. Understanding these strengths helps you minimize unnecessary conversions and choose the right format from the start.
Every format conversion carries the risk of information loss, and understanding where loss occurs prevents surprises. Converting JSON to CSV loses hierarchical structure — nested objects must be flattened, and arrays may need to be serialized as strings within cells. Converting JSON to XML introduces ambiguity around attributes versus elements and how to represent arrays. Converting YAML to JSON discards comments, anchors, and aliases. Type coercion is another common pitfall: CSV stores all values as strings, so boolean true and string "true" become indistinguishable after a round trip through CSV. Null values, empty strings, and missing keys each behave differently across formats. Testing round-trip conversions (A → B → A) against your actual data reveals these edge cases before they cause problems in production.
The tool supports six bidirectional conversions: JSON to YAML, JSON to CSV, JSON to XML, and the reverse directions — YAML to JSON, CSV to JSON, and XML to JSON. All conversions run instantly in your browser.
Yes. All processing happens locally in your browser using JavaScript. Your data is never transmitted to any server, logged, or stored. This makes the tool safe for converting API responses, configuration files, database exports, and any other sensitive data.
Nested JSON objects are flattened using dot notation for CSV column headers. For example, an object with address.city and address.zip becomes two separate columns. When converting CSV back to JSON, dot-notation headers are automatically reconstructed into nested objects.
Arrays are converted to repeated sibling elements wrapped in a parent tag. Each array item becomes an <item> element. When converting XML back to JSON, repeated sibling elements with the same tag name are automatically grouped into arrays.
JSON ↔ YAML conversion is lossless for all standard JSON data types. JSON ↔ CSV may lose type information (numbers become strings) and cannot represent deeply nested structures without flattening. JSON ↔ XML preserves structure but null values and array semantics require conventions.
When converting YAML to JSON, comments are discarded because JSON does not support comments. This is standard behavior — no data is lost, only annotations. If you need to preserve comments, keep the original YAML file alongside the JSON output.
Empty strings, null values, and missing fields are handled consistently. In CSV, empty cells become null when converted to JSON. In XML, empty elements become null. In YAML, null and tilde (~) are both recognized as null values.
Yes. There are no file size limits. Processing runs entirely in your browser, so the practical limit depends on your device's available memory. Most devices handle files of several megabytes without issues.
The tool provides explicit conversion direction buttons so you select both the source and target format. This ensures accurate parsing — the tool knows whether to treat your input as JSON, YAML, CSV, or XML.
Yes. The Download button saves the converted output as a file with the correct extension (.json, .yaml, .csv, or .xml). The Copy button copies the output to your clipboard for pasting into editors or terminals.
Learn how to convert data between JSON, YAML, CSV, and XML formats. Understand conversion challenges, data loss risks, and best practices for each format.
Read more →Compare YAML and JSON across syntax, readability, security, and tooling. Learn when each format excels for APIs, Kubernetes, CI/CD, and configuration files.
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