How to Change YAML to JSON (and Back)

Developer · Step-by-step guide · 4 steps · 2 min read

YAML and JSON are two ways to write data as text. Settings files often use YAML. Apps often want JSON. This tool swaps between them as you type.

In the pictures, orange letters like A show where to look. Each step tells you its letter.

Step 1: Pick the direction

At the top, choose YAML → JSON or JSON → YAML. See A in the picture.

Paste your YAML or JSON into the left box. Or press Load Sample to try it. See B in the picture.

The result shows on the right right away. If there is a mistake, the tool tells you which line it is on. See C in the picture.

Press Copy Output. Use Result as Input moves the result to the left box. See D in the picture.

YAML is strict about spaces. Use spaces, not tabs. Items at the same level must line up exactly. The error points to the line to fix.

No. JSON has no comments. So YAML comments are dropped.

Yes, as much as your browser can hold. Everything runs on your device.

Your data is handled in your browser. It is never sent to us. So it is safe to paste private or work data.

The YAML to JSON Converter is free. You do not need an account.