In1.

JSON to YAML converter

Paste JSON to get clean YAML, or paste YAML to get formatted JSON. The conversion runs both ways, validates your input and reports errors clearly — all instantly in your browser.

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How to use JSON to YAML

  1. 1

    Choose a direction

    Pick JSON to YAML or YAML to JSON.

  2. 2

    Paste your data

    Drop in the JSON or YAML you want to convert.

  3. 3

    Read the result

    The converted format appears instantly, cleanly formatted, with errors flagged if the input is invalid.

  4. 4

    Copy it out

    Copy the converted output with one click.

Two formats for the same data

JSON and YAML are two of the most common ways to represent structured data, and they describe exactly the same kinds of things — objects, lists, strings, numbers and booleans — just with different syntax. JSON, with its braces, brackets and quotes, is compact and universal, the lingua franca of APIs and JavaScript. YAML, with its indentation and minimal punctuation, is easier for humans to read and write, which is why it dominates configuration files for tools like Docker, Kubernetes, CI pipelines and countless others. Because both formats are everywhere, you constantly need to move data between them: turning an API's JSON response into readable YAML, or converting a YAML config into the JSON a program expects. This converter does that in either direction. You paste one format and get the other, faithfully preserving the structure and values, so you never have to translate the nesting and syntax by hand — a process that is tedious and remarkably easy to get wrong on anything but the smallest snippet.

Convert in both directions

A one-way converter only solves half the problem, so In1 handles both directions with a single toggle. Switch it to JSON-to-YAML when you want to take compact, punctuation-heavy JSON and turn it into clean, indented YAML that is pleasant to read and edit — ideal when you are writing or reviewing configuration. Switch it to YAML-to-JSON when you need to feed YAML-authored data into something that only speaks JSON, such as an API, a JavaScript program or a tool that does not parse YAML. The output updates the moment you type or flip the direction, so you can paste into either side and immediately get the other. This bidirectional design means the same tool serves both the person who prefers writing YAML but has to deliver JSON, and the person who receives JSON but wants to read it as YAML. You are never stuck with the wrong format or forced to find a second tool to go back the other way.

Clean output and clear errors

A conversion is only useful if the result is correct and the formatting is sensible, so In1 produces clean output you can use directly. YAML is generated with consistent two-space indentation, the widely accepted convention, and without arbitrary line wrapping that would mangle long string values. JSON is pretty-printed with proper indentation so it is easy to read and review rather than crammed onto one line. Just as important is what happens when the input is wrong. Both JSON and YAML have strict syntax, and a misplaced comma, a bad indent or an unclosed quote makes the input unparseable. Instead of failing silently or producing garbage, the converter validates your input and shows a clear error message describing what went wrong, so you can find and fix the problem quickly. That feedback turns the tool into a lightweight validator as well as a converter: if it produces output, your input was well-formed, and if it does not, it tells you why.

Private by design — converted in your browser

Configuration and data files often hold sensitive details: hostnames, settings, structure that reveals how an internal system is built, sometimes even credentials that should never have been there. There is no reason to send any of that to a server just to reshape its syntax. In1 performs the entire JSON-and-YAML conversion locally in your browser using a well-established parsing library bundled into the page. Nothing is uploaded, nothing is stored and there is no account to create. The conversion happens instantly because there is no network round trip, and it works exactly the same offline as online, which is handy when you are deep in a project on a locked-down network. You can paste a large config and get the converted form immediately, then copy it with a single click. This local-only approach is the responsible default for developer tools that handle configuration, because the data you are converting is frequently something you would never paste into an unknown online service.

Who converts between JSON and YAML?

The need is everywhere in modern software work. DevOps and platform engineers move constantly between the two formats while writing and debugging configuration for containers, orchestration, infrastructure-as-code and CI/CD pipelines, most of which use YAML, while the data and APIs around them use JSON. Back-end developers convert API responses to YAML to read them more easily, or YAML fixtures to JSON for their code. Front-end developers turn YAML content files into the JSON their apps consume. Site reliability engineers reshape configuration between formats while troubleshooting. Technical writers convert example data so documentation can show both forms. QA engineers translate test data between the format a tool emits and the format another expects. Even people new to YAML paste in some JSON to see the equivalent and learn the syntax by comparison. For all of them, a converter that goes both ways, formats the output cleanly, reports errors plainly and keeps the data on the device is exactly the quick, trustworthy tool the job calls for.

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