diff --git a/.github/README.md b/.github/README.md
new file mode 100644
index 0000000..830f5b3
--- /dev/null
+++ b/.github/README.md
@@ -0,0 +1,10 @@
+# yasch
+
+Some YAML utilities, including:
+
+* Converts any Go structs into a JSON Schema file
+* A command line tool `yamlchk` for validating YAML files with a local JSON Schema file
+
+## License
+
+MIT
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..662c840
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,23 @@
+.DS_Store
+/.idea/
+/.vscode/
+
+### Go ###
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+# vendor/
+
+# Go workspace file
+go.work
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..6c70264
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2023 ANQUR
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/cmd/yamlchk/main.go b/cmd/yamlchk/main.go
new file mode 100644
index 0000000..713ef22
--- /dev/null
+++ b/cmd/yamlchk/main.go
@@ -0,0 +1,62 @@
+// Package main checks YAML files for a given JSON schema.
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"net/url"
+	"os"
+	"path/filepath"
+
+	validator "github.com/xeipuuv/gojsonschema"
+	"gopkg.in/yaml.v3"
+)
+
+func main() {
+	var (
+		schemaFile string
+		files      []string
+	)
+	flag.StringVar(&schemaFile, "s", "", "schema file path")
+	flag.Parse()
+	files = flag.Args()
+
+	if len(files) == 0 {
+		flag.Usage()
+		log.Fatalln("no YAML files to check")
+	}
+
+	p, err := filepath.Abs(schemaFile)
+	if err != nil {
+		log.Panicln(err)
+	}
+
+	refURL := &url.URL{Scheme: "file", Path: p}
+	schemaLoader := validator.NewReferenceLoader(refURL.String())
+
+	for _, file := range files {
+		log.Println("checking", file)
+
+		d, err := os.ReadFile(file)
+		if err != nil {
+			log.Panicln(err)
+		}
+
+		m := make(map[string]interface{})
+		if err := yaml.Unmarshal(d, &m); err != nil {
+			log.Panicln(err)
+		}
+
+		ret, err := validator.Validate(schemaLoader, validator.NewGoLoader(m))
+		if err != nil {
+			log.Panicln(err)
+		}
+		if !ret.Valid() {
+			for _, err := range ret.Errors() {
+				log.Printf("%s\n", err)
+			}
+			log.Panicln(fmt.Sprintf("invalid file: %s", file))
+		}
+	}
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..96aea95
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,15 @@
+module github.com/anqur/yasch
+
+go 1.20
+
+require (
+	github.com/alecthomas/jsonschema v0.0.0-20220216202328-9eeeec9d044b
+	github.com/xeipuuv/gojsonschema v1.2.0
+	gopkg.in/yaml.v3 v3.0.1
+)
+
+require (
+	github.com/iancoleman/orderedmap v0.0.0-20190318233801-ac98e3ecb4b0 // indirect
+	github.com/xeipuuv/gojsonpointer v0.0.0-20180127040702-4e3ac2762d5f // indirect
+	github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..ad576e3
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,22 @@
+github.com/alecthomas/jsonschema v0.0.0-20220216202328-9eeeec9d044b h1:doCpXjVwui6HUN+xgNsNS3SZ0/jUZ68Eb+mJRNOZfog=
+github.com/alecthomas/jsonschema v0.0.0-20220216202328-9eeeec9d044b/go.mod h1:/n6+1/DWPltRLWL/VKyUxg6tzsl5kHUCcraimt4vr60=
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/iancoleman/orderedmap v0.0.0-20190318233801-ac98e3ecb4b0 h1:i462o439ZjprVSFSZLZxcsoAe592sZB1rci2Z8j4wdk=
+github.com/iancoleman/orderedmap v0.0.0-20190318233801-ac98e3ecb4b0/go.mod h1:N0Wam8K1arqPXNWjMo21EXnBPOPp36vB07FNRdD2geA=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+github.com/stretchr/testify v1.3.1-0.20190311161405-34c6fa2dc709 h1:Ko2LQMrRU+Oy/+EDBwX7eZ2jp3C47eDBB8EIhKTun+I=
+github.com/stretchr/testify v1.3.1-0.20190311161405-34c6fa2dc709/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+github.com/xeipuuv/gojsonpointer v0.0.0-20180127040702-4e3ac2762d5f h1:J9EGpcZtP0E/raorCMxlFGSTBrsSlaDGf3jU/qvAE2c=
+github.com/xeipuuv/gojsonpointer v0.0.0-20180127040702-4e3ac2762d5f/go.mod h1:N2zxlSyiKSe5eX1tZViRH5QA0qijqEDrYZiPEAiq3wU=
+github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415 h1:EzJWgHovont7NscjpAxXsDA8S8BMYve8Y5+7cuRE7R0=
+github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415/go.mod h1:GwrjFmJcFw6At/Gs6z4yjiIwzuJ1/+UwLxMQDVQXShQ=
+github.com/xeipuuv/gojsonschema v1.2.0 h1:LhYJRs+L4fBtjZUfuSZIKGeVu0QRy8e5Xi7D17UxZ74=
+github.com/xeipuuv/gojsonschema v1.2.0/go.mod h1:anYRn/JVcOK2ZgGU+IjEV4nwlhoK5sQluxsYJ78Id3Y=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..451b7ae
--- /dev/null
+++ b/main.go
@@ -0,0 +1,18 @@
+package yasch
+
+import (
+	"os"
+
+	"github.com/alecthomas/jsonschema"
+)
+
+// WriteFile Write the structure definition to a JSON schema file.
+func WriteFile(data interface{}, path string) {
+	d, err := jsonschema.Reflect(data).MarshalJSON()
+	if err != nil {
+		panic(err)
+	}
+	if err := os.WriteFile(path, d, 0644); err != nil {
+		panic(err)
+	}
+}