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Version: 0.4.4



The KCL Validation tool supports basic configuration data verification capabilities. You can write a KCL schema to verify the type and value of the input JSON/YAML files.

How to use

There is a JSON format file data.json:

"name": "Alice",
"age": "18",
"message": "This is Alice",
"data": {
"id": "1",
"value": "value1"
"labels": {
"key": "value"
"hc": [1, 2, 3]

Build a validated KCL file schema.k:

schema User:
name: str
age: int
message?: str
data: Data
labels: {str:}
hc: [int]

age > 10

schema Data:
id: int
value: str

Execute the following command:

$ kcl-vet data.json schema.k
Validate succuss!

Specify the schema for validation

When multiple schema definitions exist in the KCL file, by default, the KCL Validation tool will use the first schema to check. If you need to specify a schema for verification, you can use the -d|--schema parameter

$kcl-vet data.json schema.k -d User


$ kcl-vet -h
usage: kcl-vet [-h] [-d schema] [--format format] [-n attribute_name]
data_file kcl_file

positional arguments:
data_file Validation data file
kcl_file KCL file

optional arguments:
-h, --help show this help message and exit
-d schema, --schema schema
--format format Validation data file format, support YAML and JSON
-n attribute_name, --attribute-name attribute_name