JSON Formatter & Format Converter
Format and convert JSON, YAML, TOML, XML, and CSV entirely in your browser — no data leaves your device.
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Convert structured data between common formats when you need to move between APIs, config files, or exports.
What to expectPaste JSON, YAML, TOML, XML, or CSV and the tool will detect the input format, convert it, and show the result instantly.
Good to knowBest for valid structured data; malformed input will surface parse errors rather than guessing.
How it works
- Paste JSON, YAML, TOML, XML, or CSV into the input panel on the left.
- Confirm the detected source format, pick a target format in the center strip, and click Convert.
- Review the formatted output on the right, then copy or download it for use in your project.
All processing happens in your browser. Pasted data is never uploaded, logged, or sent to any server.
Converted output appears here
Paste supported data on the left to begin.
Frequently Asked Questions
Can I convert JSON to YAML without installing anything?
Yes. Paste your JSON into the input panel, confirm that JSON was detected, choose YAML as the target format, and click Convert. Everything runs inside your browser, so you do not need to install CLIs, libraries, or IDE extensions.
Does this tool send my data to a server?
No. Parsing and conversion are performed with JavaScript in your browser. JSON, YAML, TOML, XML, and CSV content never leaves your device, which makes the tool suitable for handling sensitive configuration files in a private workspace.
Which formats does this converter support?
The converter supports JSON, YAML, TOML, XML, and CSV. It auto-detects the input format where possible and lets you select any of the other formats as the output target, so you can jump between config styles without memorizing syntax.
What happens if the input is invalid?
If the converter cannot parse your input, it shows a clear error message and, when possible, a line number. That makes it easy to correct malformed JSON, YAML, TOML, XML, or CSV before trying again.
Can I safely convert configuration files that contain secrets?
Because conversion is local to your browser, secrets in config files are not uploaded to DataSmith.io or any external service. You should still treat the browser tab as sensitive, avoid sharing your screen carelessly, and close the page when you're done.
Will the converter reformat my JSON or YAML for readability?
Yes. Structured formats are pretty-printed with consistent indentation so the result is easier to diff, review, and commit. This makes the tool useful as a quick formatter even if you are not changing formats.
Is there a size limit on the data I can paste?
The converter is tuned for typical configuration files and small to medium payloads. Very large inputs may still work but feel slower because all parsing happens in the browser; for huge exports, a local CLI might be more comfortable.
How to use this tool
Paste data in any supported format in the left panel. The tool detects the format automatically. Choose the target format in the center strip and click Convert. Use Swap to move output back to input.