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diff --git a/‎src/GithubHelper.js‎
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+'use strict';
+
+class GithubHelper {
+    /**
+     * Set authentication repository config
+     * @param {Object} repo - personal access token
+     */
+    constructor(repo) {
+        this.repo = repo;
+    }
+
+    /**
+     * make and return promise, using github api
+     * @param {Function} api - api function
+     * @returns {Promise} - response data, or error
+     */
+    request(api) {
+        return api()
+            .then(response => {
+                if (response.status !== 200) {
+                    throw new Error(this.pretty(response));
+                }
+
+                return response;
+            });
+    }
+
+    /**
+     * console log on error
+     * @param {Exception} error - error while Promise
+     * @param {string} [description] - additional description on error
+     */
+    consoleError(error, description) {
+        if (error && error.message) {
+            console.error(error.message);
+        }
+
+        if (description) {
+            console.error(description);
+        }
+    }
+
+    /**
+     * Get all tags in github
+     * then set COMPARE and BASE tag by argments
+     * BASE tag omits when COMPARE tag is initial tag
+     * @returns {Promise} - compare tag and base tag
+     */
+    getTags() {
+        return this.request(this.repo.listTags.bind(this.repo))
+            .then(response => response.data)
+            .catch(err => this.consoleError(err, 'Could not get tags from github'));
+    }
+
+    /**
+     * tag range needed to collect commits
+     * @typedef {Object} Range - comparing ranges from `base` to `compare`
+     * @property {string} compare - tag to deploy
+     * @property {stirng} [base] - prior release tag
+     */
+    /**
+     * Get tag names to compare
+     * 
+     * @param {Array} tags - tags, latest tag comes first
+     * @param {string} argvTag - tag passed as a argument at bash
+     * @returns {Range} - tags to compare
+     */
+    getTagRange(tags, argvTag) {
+        const range = argvTag ? this.getTagsWithTagName(tags, argvTag) : this.getLatestTwoTags(tags);
+
+        this.releasingTag = range.compare.name;
+        console.log(`\n>>>> tag: ${this.releasingTag}`);
+
+        return range;
+    }
+
+    /**
+     * User set target tag by `--tag={tag}` option at bash
+     * Find target tag from tag list, 
+     * @param {Array} tags - tags, latest tag comes first
+     * @param {string} findingTag - tag name want to find, come from bash
+     * @returns {Range} - tags to compare
+     */
+    getTagsWithTagName(tags, findingTag) {
+        let compare = null;
+        let base = null;
+
+        const {length} = tags;
+        const index = tags.findIndex(tag => tag.name === findingTag);
+        compare = tags[index];
+        if (index < length - 1) {
+            base = tags[index + 1];
+        }
+
+        if (!compare) {
+            throw new Error(`Could not find ${findingTag} in GitHub tag list`);
+        }
+
+        return {
+            compare,
+            base
+        };
+    }
+
+    /**
+     * Get latest two tags
+     * @param {Array} tags - tags in Github
+     * @returns {Range} - tags to compare
+     */
+    getLatestTwoTags(tags) {
+        const [compare] = tags;
+        const base = tags[1] || null;
+
+        if (!compare) {
+            throw new Error('Could not find latest tag. No tags in GitHub');
+        }
+
+        return {
+            compare,
+            base
+        };
+    }
+
+    /**
+     * Get commit logs between tags
+     * @param {string} since - tag name registered former
+     * @param {string} until - tag name registered latter
+     * @returns {Promise} - get commit logs between tags
+     */
+    getCommitLogsBetweenTags(since, until) {
+        return this.request(this.repo.compareBranches.bind(this.repo, since, until))
+            .then(response => response.data.commits)
+            .catch(this.consoleError);
+    }
+
+    /**
+     * Get commit by tag name
+     * @param {string} tag - tag name 
+     * @returns {Promise} - get commit on tagging
+     */
+    getCommitByTag(tag) {
+        return this.request(this.repo.getSingleCommit.bind(this.repo, tag))
+            .then(response => response.data)
+            .catch(err => this.consoleError(
+                err, `Could not get commit of ${tag}. Please check tag is registered on GitHub.`
+            ));
+    }
+
+    /**
+     * Get commit by sha
+     * @param {string} sha - sha code
+     * @returns {Promise} - get commit by sha
+     */
+    getCommitBySHA(sha) {
+        return this.request(this.repo.getCommit.bind(this.repo, sha))
+            .then(response => response.data)
+            .catch(err => this.consoleError(err, `Could not get commit by ${sha.substr(0, 7)}`));
+    }
+
+    /**
+     * Get commit list
+     * @param {Object} options - list commit options
+     * @returns {Promise} get commit logs
+     */
+    getCommits(options) {
+        return this.request(this.repo.listCommits.bind(this.repo, options))
+            .then(response => response.data)
+            .catch(err => this.consoleError(err, 'Could not get commits'));
+    }
+
+    /**
+     * Post release note
+     * @param {string} releaseNote - generated release note
+     */
+    publishReleaseNote(releaseNote) {
+        const options = {
+            'tag_name': this.releasingTag,
+            name: this.releasingTag,
+            body: releaseNote
+        };
+
+        return this.request(this.repo.createRelease.bind(this.repo, options))
+            .then(() => {
+                console.log('Posted release notes to GitHub')
+            })
+            .catch(err => this.consoleError(err, 'Could not post release notes to GitHub'));
+    }
+
+    /**
+     * Print http request and response data on console
+     * @param {JSON} response - http response
+     */
+    pretty(response) {
+        console.log('****************************************************************');
+        console.log(`* method: ${response.config.method}`);
+        console.log(`* url: ${response.config.url}`);
+        console.log(`* status: ${response.status} ${response.statusText}`);
+        console.log('* ------------------------------------------------------------- *');
+        console.log('* data: ');
+        console.log(response.data);
+        console.log('****************************************************************');
+    }
+}
+
+module.exports = GithubHelper;