YAML to JSON converter

How to convert YAML to JSON

To convert YAML to JSON, paste your YAML in the input box with YAML to JSON selected. Indented blocks become nested objects, dashes become arrays, and values such as true, 2 and null become real JSON booleans, numbers and null. If the YAML has a mistake, the tool points to the problem line. The conversion runs in your browser.

A worked example

This YAML mixes a string, a boolean, a number, a list and a nested block:

YAML input

name: UtilsDock
active: true
version: 2
tags:
  - tools
  - free
owner:
  city: Madrid
  since: 2026

JSON output

{
  "name": "UtilsDock",
  "active": true,
  "version": 2,
  "tags": [
    "tools",
    "free"
  ],
  "owner": {
    "city": "Madrid",
    "since": 2026
  }
}

Where you need this conversion

• Kubernetes, Docker Compose and GitHub Actions files are YAML, while their APIs and many tools speak JSON.
• OpenAPI specs are often written in YAML and consumed as JSON by generators and validators.
• Config files that have to be loaded by code that only has a JSON parser.

YAML gotchas

• Indentation defines the structure and must use spaces, never tabs.
• Unquoted values are guessed: yes, no and on may be read as booleans by some parsers, and 1.0 as a number. Quote them to keep text.
• Comments start with # and are dropped, because JSON has no comments.
• Anchors and aliases are resolved, so repeated blocks are written out in full.

Private by design

The conversion runs in your browser. What you type, paste or drop is never uploaded, which matters when the text holds tokens, personal data or internal files.