diff --git a/cli.ts b/cli.ts
new file mode 100644
index 0000000..291756b
--- /dev/null
+++ b/cli.ts
@@ -0,0 +1,8 @@
+import {join} from 'https://deno.land/std@0.166.0/path/mod.ts';
+import { expandGlob } from 'https://deno.land/std@0.166.0/fs/mod.ts';
+import { DocParser, readDoc } from './doc_load/load.ts';
+
+for await(const dir of expandGlob('sample/*.md')) {
+  console.log(dir.path);
+  await readDoc(dir.path, true);
+}
\ No newline at end of file
diff --git a/deno.lock b/deno.lock
index cfdf63c..93fd286 100644
--- a/deno.lock
+++ b/deno.lock
@@ -1,6 +1,12 @@
 {
   "version": "2",
   "remote": {
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diff --git a/doc_load/load.test.ts b/doc_load/load.test.ts
new file mode 100644
index 0000000..e22bfd2
--- /dev/null
+++ b/doc_load/load.test.ts
@@ -0,0 +1,15 @@
+import { assertEquals } from "std/testing/asserts.ts";
+import { fromFileUrl, join } from "std/path/mod.ts";
+import { readDoc } from "./load.ts";
+
+Deno.test("readDoc", async () => {
+    let path = fromFileUrl(import.meta.url)
+    path = join(path,"../mysample.md");
+    const doc = await readDoc(path, true);
+    assertEquals(doc.name, "aws-cdk");
+    assertEquals(doc.star, 9537);
+    assertEquals(doc.fork, 2905);
+    assertEquals(doc.desc, "The AWS Cloud Development Kit is a framework for defining cloud infrastructure in code");
+    assertEquals(doc.url, "https://github.com/aws/aws-cdk");
+    assertEquals(doc.tags, ['aws', 'typescript', 'cloud-infrastructure', 'infrastructure-as-code']);
+});
diff --git a/doc_load/load.ts b/doc_load/load.ts
new file mode 100644
index 0000000..919dd67
--- /dev/null
+++ b/doc_load/load.ts
@@ -0,0 +1,136 @@
+import {parse as parseYaml, stringify} from "https://deno.land/std@0.166.0/encoding/yaml.ts";
+
+function trimSubstring(str: string, start: number, end: number) {
+    while (str[start] === ' ' || str[start] === '\t' || str[start] === '\r' || str[start] === '\n') {
+        start++;
+    }
+    return str.substring(start, end);
+}
+
+function splitTwo(str: string, separator: string): [string, string] {
+    const index = str.indexOf(separator);
+    if (index === -1) {
+        return [str, ''];
+    }
+    return [str.substring(0, index), str.substring(index + separator.length)];
+}
+
+export interface Doc {
+    from_url?: string;
+    name: string;
+    author: string;
+    star: number;
+    fork: number;
+    desc: string;
+    url: string;
+    tags: string[];
+    readme: string;
+}
+
+export class DocParser {
+    constructor() {
+    }
+    
+    parse(content: string) {
+        if(!content.startsWith('---')){
+            throw new Error('Invalid doc format');
+        }
+        const index = content.indexOf('\n---', 3);
+        const meta = content.substring(3, index);
+        const readme = trimSubstring(content, index + 4, content.length);
+        const doc = parseYaml(meta) as Doc;
+        doc.readme = readme;
+        return doc;
+    }
+
+    parseAlternative(content: string): Doc {
+        if(!content.startsWith('---')){
+            throw new Error('Invalid doc format');
+        }
+        const index = content.indexOf('\n---', 3);
+        const meta = content.substring(3, index);
+        const readme = trimSubstring(content, index + 4, content.length);
+        const doc = {} as Doc;
+        const lines = meta.split('\n').map(line => line.trim());
+        for(const line of lines){
+            if(line.length === 0) continue;
+            let [key, value] = splitTwo(line, ':');
+            value = value.trimStart();
+            if (value.startsWith('"') && value.endsWith('"')) {
+                value = value.substring(1, value.length - 1);
+                value = value.replace('\\"', '"');
+            }
+            key = key.trimEnd();
+            switch(key){
+                case 'name':
+                    doc.name = value;
+                    break;
+                case 'author':
+                    doc.author = value;
+                    break;
+                case 'star':
+                    doc.star = parseInt(value);
+                    break;
+                case 'fork':
+                    doc.fork = parseInt(value);
+                    break;
+                case 'desc':
+                    doc.desc = value;
+                    break;
+                case 'url':
+                    doc.url = value;
+                    break;
+                case 'tags':
+                    doc.tags = JSON.parse(value.replaceAll("'",'"'));
+                    break;
+                case 'from_url':
+                    doc.from_url = value;
+                    break;
+                default:
+                    throw new Error(`Invalid key: ${key}`);
+            }
+        }
+        doc.readme = readme;
+        return doc;
+    }
+}
+
+export async function readDoc(path: string, alternative: boolean = false): Promise<Doc> {
+    const doc = await Deno.readTextFile(path);
+    const parser = new DocParser();
+    if(alternative){
+        return parser.parseAlternative(doc);
+    }
+    return parser.parse(doc);
+}
+
+function genDocContent(doc: Doc): string {
+    return `---
+${doc.from_url ? `from_url: ${doc.from_url}\n` : ''}name: "${doc.name}"
+author: "${doc.author}"
+star: ${doc.star}
+fork: ${doc.fork}
+desc: "${doc.desc.replaceAll("\"", "\\\"")}"
+url: ${doc.url}
+tags: ${JSON.stringify(doc.tags)}
+---
+${doc.readme}
+`;
+}
+
+export async function writeDoc(path: string, doc: Doc, options?: Omit<Deno.WriteFileOptions, "append">) {
+    const content = genDocContent(doc);
+    await Deno.writeTextFile(path, content, options);
+}
+
+async function main() {
+    const doc = await readDoc('./mysample.md');
+    console.log(stringify(doc as any));
+    const doc2 = await readDoc('./mysample.md', true);
+    console.log(stringify(doc2 as any));
+    console.log(genDocContent(doc2));
+}
+
+if (import.meta.main) {
+    await main();
+}
\ No newline at end of file
diff --git a/doc_load/mysample.md b/doc_load/mysample.md
new file mode 100644
index 0000000..943310d
--- /dev/null
+++ b/doc_load/mysample.md
@@ -0,0 +1,11 @@
+---
+from_url: https://github.com/donnemartin/awesome-aws
+name: aws-cdk
+author: 0x0d
+star: 9537
+fork: 2905
+desc: "The AWS Cloud Development Kit is a framework for defining cloud infrastructure in code"
+tags: ['aws', 'typescript', 'cloud-infrastructure', 'infrastructure-as-code']
+url: https://github.com/aws/aws-cdk
+---
+read
\ No newline at end of file
diff --git a/import_map.json b/import_map.json
index 4312cca..97893bf 100644
--- a/import_map.json
+++ b/import_map.json
@@ -7,6 +7,9 @@
     "@preact/signals": "https://esm.sh/*@preact/signals@1.0.3",
     "@preact/signals-core": "https://esm.sh/*@preact/signals-core@1.0.1",
     "twind": "https://esm.sh/twind@0.16.17",
-    "twind/": "https://esm.sh/twind@0.16.17/"
+    "twind/": "https://esm.sh/twind@0.16.17/",
+    "cliffy": "https://deno.land/x/cliffy@v0.25.4/mod.ts",
+    
+    "std/": "https://deno.land/std/"
   }
 }
diff --git a/validator.ts b/validator.ts
new file mode 100644
index 0000000..297c753
--- /dev/null
+++ b/validator.ts
@@ -0,0 +1,93 @@
+import { Command } from "cliffy";
+import { DocParser, readDoc, writeDoc, Doc } from "./doc_load/load.ts";
+import { expandGlob } from "https://deno.land/std@0.166.0/fs/mod.ts";
+
+function checkAndPrint(doc: Doc, another: Doc): [boolean, string[]] {
+    const diffs = [];
+    if (doc.name !== another.name) {
+        diffs.push(`name: ${doc.name} => ${another.name}`);
+    }
+    if (doc.author !== another.author) {
+        diffs.push(`author: ${doc.author} => ${another.author}`);
+    }
+    if (doc.star !== another.star) {
+        diffs.push(`star: ${doc.star} => ${another.star}`);
+    }
+    if (doc.fork !== another.fork) {
+        diffs.push(`fork: ${doc.fork} => ${another.fork}`);
+    }
+    if (doc.desc !== another.desc) {
+        diffs.push(`desc: "${doc.desc}" => ${another.desc}`);
+    }
+    if (doc.url !== another.url) {
+        diffs.push(`url: ${doc.url} => ${another.url}`);
+    }
+    if (doc.tags.length !== another.tags.length) {
+        diffs.push(`tags: ${doc.tags} => ${another.tags}`);
+    }
+    else {
+        doc.tags = doc.tags.sort();
+        another.tags = another.tags.sort();
+        for (let i = 0; i < doc.tags.length; i++) {
+            if (doc.tags[i] !== another.tags[i]) {
+                diffs.push(`tags: ${doc.tags} => ${another.tags}`);
+                break;
+            }
+        }
+    }
+    if (doc.readme !== another.readme) {
+        diffs.push(`readme: ${doc.readme} => ${another.readme}`);
+    }
+    if (doc.from_url !== another.from_url) {
+        diffs.push(`from_url: ${doc.from_url} => ${another.from_url}`);
+    }
+    return [diffs.length === 0, diffs];
+}
+
+if(import.meta.main){
+    const app = new Command()
+        .name("validator")
+        .version("0.1.0")
+        .description("Validate and fix the doc files in the sample directory. glob is supported.")
+        .option("-v, --verbose", "Enable verbose mode.")
+        .option("-f, --fix", "Fix the doc files.")
+        .arguments("[pathes...:string]")
+        .action(async (options, ...pathes) => {
+            const { verbose, fix } = options;
+            const parser = new DocParser();
+            for (const path of pathes) {
+                for await (const dir of expandGlob(path)) {
+                    if (verbose) {
+                        console.log(`Processing ${dir.path}`);
+                    }
+                    const content = await Deno.readTextFile(dir.path);
+                    const doc = parser.parseAlternative(content);
+                    if (fix) {
+                        await writeDoc(dir.path, doc);
+                    }
+                    else {
+                        try {
+                            parser.parse(content);
+                            const another = parser.parse(content);
+                            const [isSame, errors] = checkAndPrint(doc, another);
+                            if (!isSame) {
+                                console.log(`File ${dir.path} is not valid.`);
+                                for (const error of errors) {
+                                    console.log("\t",error);
+                                }
+                            }
+                        }
+                        catch (e) {
+                            if ( e instanceof Error) {
+                                console.log(`File ${dir.path} is not valid. error: ${e.name}`);
+                            }
+                            else {
+                                throw e;
+                            }
+                        }
+                    }
+                }
+            }
+        });
+    await app.parse(Deno.args);
+}
\ No newline at end of file