YAML to JSON converter
Paste a YAML file such as docker-compose.yml or a settings file to get formatted JSON. If something is wrong you see the line number and the reason.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Enter yaml text and indentation.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
YAML is read with the YAML 1.2 core schema: null and ~ become null, true and false become booleans, decimal, 0x hex and 0o octal numbers become numbers, and everything else is text. A | block keeps line breaks and a > block folds lines with spaces. The JSON is then written with 2 or 4 space indentation.
Example
Inputs: Indentation = 2 spaces. Result: JSON: { "app": "toolsahla", "port": 8080, "debug": false, "languages": [ "ar", "en" ], "database": { "host": "localhost", "user": "admin" }, "welcome": "Welcome to ToolSahla\nأهلا بك\n" }.
# App settings app: toolsahla port: 8080 debug: false languages: - ar - en database: host: localhost user: admin welcome: | Welcome to ToolSahla أهلا بك
{
"app": "toolsahla",
"port": 8080,
"debug": false,
"languages": [
"ar",
"en"
],
"database": {
"host": "localhost",
"user": "admin"
},
"welcome": "Welcome to ToolSahla\nأهلا بك\n"
}Limits and caveats
- The tool supports a clear YAML subset: maps, lists, scalars, quoted strings, | and > block scalars and [ ] and { } flow collections. Anchors &, aliases *, tags ! and multiple documents are rejected with a clear message.
- Comments are dropped because JSON has none.
- .inf and .nan have no JSON equivalent and give an error.
Questions about this tool
Why do I see "anchors are not supported"?
The file uses & and * to repeat a part. Write the repeated values out in full and convert again.
Do yes and no become true and false?
No. Under YAML 1.2 yes and no stay text; only true and false are booleans.
What does the tab indentation error mean?
YAML does not allow the Tab key for indentation. Replace it with spaces on the line shown.