Tag and category pages

gatsby-node.js

@@ -33,6 +33,11 @@ exports.createPages = async ({ graphql, actions }) => {
                     fieldValue
                 }
             }
+            categoriesGroup: allMarkdownRemark {
+                group(field: frontmatter___categories) {
+                    fieldValue
+                }
+            }
         }
     `);
 
@@ -55,4 +60,14 @@ exports.createPages = async ({ graphql, actions }) => {
             }
         });
     });
+
+    result.data.categoriesGroup.group.forEach((category) => {
+        createPage({
+            path: `/categories/${category.fieldValue}/`,
+            component: path.resolve(`./src/templates/category.js`),
+            context: {
+                category: category.fieldValue
+            }
+        });
+    });
 };