Create ajv-validator.md

docs/3rd-party-lib/ajv-validator.md

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+# AJV Validator
+
+### Import
+#### Nodejs
+```ts
+import nhttp from "nhttp-land";
+import Ajv from "ajv";
+```
+
+### Usage
+#### Nodejs
+```ts
+const app = nhttp();
+const ajv = new Ajv();
+
+// ajv validate middleware
+const validate = (schema) => (rev, next) => {
+  const valid = ajv.validate(schema, rev.body);
+  if (valid) return next();
+  throw new HttpError(422, ajv.errors);
+}
+
+const foobarSchema = {
+  type: "object",
+  properties: {
+    foo: {type: "integer"},
+    bar: {type: "string"}
+  },
+  required: ["foo"],
+  additionalProperties: false
+}
+
+app.post("/save", validate(foobarSchema), () => "success save foobar");
+```