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JSON to YAML Converter

Convert between JSON and YAML both ways, privately in your browser.

Maintained by BrowserTools · Last updated 2026-06-21

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JSON and YAML are two of the most common formats for configuration and data exchange, and converting between them is a daily chore for anyone working with Kubernetes manifests, CI pipelines, API payloads, or application config. JSON is strict and ubiquitous, ideal for machine-to-machine communication, while YAML is far more pleasant for humans to read and edit thanks to its indentation-based structure, comments, and lack of braces and quotes. This converter moves data in either direction so you can pick whichever format fits the job in front of you.

Frequently asked questions

Is my data sent to a server during conversion?
No. Both JSON-to-YAML and YAML-to-JSON conversion run entirely in your browser using a bundled library and the built-in JSON parser. Your input, which may include secrets or internal hostnames in config files, never leaves your device and is never logged.
Does converting lose any data or comments?
The data values and structure are preserved exactly when converting between the formats. YAML comments are the one thing that cannot survive a trip through JSON, because JSON has no concept of comments, so converting YAML to JSON and back will drop them. Plain data, including nested objects and arrays, round-trips cleanly.
Which YAML version and features are supported?
The converter uses a widely adopted YAML library that supports the common YAML 1.1 and 1.2 features you will meet in real config files: scalars, sequences, mappings, multi-line strings, and anchors. Highly exotic or non-standard YAML constructs may not convert, in which case the tool reports a clear parse error.
Why am I getting a parse error?
A parse error means the input is not valid in the format you selected. For JSON that is usually a trailing comma, a missing quote, or single quotes instead of double. For YAML it is most often inconsistent indentation or a tab character, since YAML requires spaces. The error message points you toward the problem.
What does the Swap button do?
Swap flips the conversion direction and moves the current output into the input box, so you can immediately convert it back. It is a quick way to round-trip data, verify a conversion, or continue working in the other format without copying and pasting by hand.
Can it handle large config files?
Yes, within reason. Files up to a few hundred kilobytes convert instantly. Very large documents are held in memory as strings and parsed in one pass, so extremely large files (many megabytes) may be slow on low-memory devices, but typical Kubernetes manifests and app configs are no problem.
Why is YAML so popular for configuration?
YAML is designed to be human-friendly: indentation shows structure, quotes and braces are mostly optional, and comments are allowed. That makes config files easier to read and review in pull requests. JSON remains the better choice for APIs and machine interchange because it is stricter and supported everywhere, which is exactly why converting between them is so common.
Does the tool work offline?
Yes. The YAML library is bundled into the page, so once it has loaded the converter runs entirely on your machine with no further network requests, even with no internet connection at all.

About JSON to YAML Converter

Choose JSON to YAML to turn a compact JSON object into a clean, indented YAML document, or switch to YAML to JSON to produce strict, pretty-printed JSON from a YAML file. The converter parses your input fully before serialising it back out, so structural mistakes such as a missing comma in JSON or inconsistent indentation in YAML are caught and reported clearly rather than producing silently broken output. A Swap button lets you flip the direction and feed the previous result straight back in, which is handy for round-tripping and quick checks.

The whole conversion happens in your browser using a bundled YAML library and the platform's native JSON parser. No data is ever sent to a server, nothing is logged, and the tool keeps working with no network connection. Because your configuration files often contain secrets, internal hostnames, and other sensitive details, keeping everything local matters, and with this tool your data never leaves the machine you are working on.

YAML stands for what, exactly?

YAML originally stood for 'Yet Another Markup Language', a slightly tongue-in-cheek name chosen when the format first appeared in 2001. The creators later changed the expansion to the recursive 'YAML Ain't Markup Language' to emphasise that it is meant for data, not for marking up documents the way HTML or XML do.

One of YAML's defining design goals was to be a strict superset of JSON. Because of that lineage, any valid JSON document is also valid YAML, which is why converting JSON to YAML is always possible and why some YAML parsers can read JSON directly. The reverse is not guaranteed, since YAML has features such as comments and anchors that JSON simply cannot represent.

YAML's reliance on significant whitespace is both its greatest strength and its most notorious pitfall. Indentation makes documents readable, but a single stray tab or a misaligned key can change the meaning of a file or break it entirely. That sensitivity is exactly why a round-trip through a strict JSON parser, as this tool offers, is such a useful way to validate that a YAML file really has the structure you intended.

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