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apitool is a wrapper of axios. It provides an organized way to work with APIs.

This goes smoothly with your TypeScript-based project since it's written in TypeScript.

Table of contents


npm install apitool --save

Getting Started

Performing a simple GET request

import Api from 'apitool';
const result = await new Api().request("get", url);
// or
const result = await new Api().get(url);

You can, of course, put params like the following:

const params = {
const result = await new Api().request("get", url, params);
// or
const result = await new Api().get(url, params);

Performing a simple POST request

As you guess,

const data = {
const result = await new Api().request("post", url, data);
// or
const result = await new Api().post(url, data);

apitool provides get, post, put and delete.

result Schema

The request returns a result. It looks like the following:

  // It indicates if error has occurred
  error: boolean;
  // It indicates what kind of error has occurred
  errorType?: ErrorType;
  // It holds an error code or any error-related data
  errorCode?: any;
  // A response object which has been transformed by your transformers.
  response?: T | undefined;
  // An original axios response object
  orgResponse?: AxiosResponse;

So after executing api call, you can handle error like this:

const result = await new Api().get(url);
if (result.error) {
  // handleError with result.errorType and result.errorCode
} else {
  // do something with result.response

Or with object destructuring,

const { error, errorType, errorCode, response } = await new Api().get(url);
if (error) {
  // handleError
} else {
  // do something

Getting deeper

So far it doesn't seem to be different from axios. Here's an real life example to help you understand what apitool really exists for.

const myApi = new Api().extend({
  before: [
    () => showLoader()
  after: [
    () => hideLoader()
  transformData: [
    (data) => decamelizeKeys(data),
  transformResponse: [
    (response) => camelizeKeys(response),

In JavaScript people usually use camelCase and in rails or in some server-side languages they usually use snake_case. With transformData and transformResponse, you can convert cases easily. And unlike axios, transformData applies to all methods including get.

before and after helps you execute things before request and things after request.

With apitool, you can extend this.

const myAuthApi = myApi.extend({
  headers: {
    Authorization: () => getAuthToken()
  responseValidations: [
    async (response, context, orgResponse) => {
      if (!invalidAuth(orgResponse)) {
      if (needToRefreshToken(orgResponse)) {
        await refreshToken();
      } else {
    (response, context, orgResponse) => {
      if (!isOkay(orgResponse)) {
        context.error("not okay");

You can put headers. Each value could be a string or a function returning a string. When it's a function, it shouldn't be async.

Next, we see responseValidations. You can put an array of functions and they might be async or sync. Each function takes three arguments:

  • response : A response object which has been transformed by your transformResponse.
  • context : A context object with functions to be called when it's not successful.
    • error(errorCode?: any) : It returns an error. Once any of error, retry or cancelAll is called, then it will not execute next validation functions. However after callbacks will be still executed.
    • retry(retryNum = 1) : If you want to retry, call this function. The result from the retried request will be returned.
    • cancelAll() : It cancels all the other ongoing requests. For example, you can call this when user needs to be logged out due to expired token.
  • orgResponse : An original axios response object
const { error, errorType, errorCode, response, orgResponse } = await myAuthApi.get(path);

ErrorType Schema

enum ErrorType {
  // `retry()` has been called, it retried, but eventually failed
  // `errorCode` won't contain anything
  // `cancelAll()` has been called from this request
  // `errorCode` won't contain anything
  // `cancelAll()` has been called from other request, so this request has got canceled
  // `errorCode` won't contain anything
  // axios has thrown an exception
  // `errorCode` will contain exception object
  // `error()` has been called
  // `errorCode` will contain whatever you passed at `error(whatever)`

Combining configs

You can extend api objects like above, however there's another approach. You can combine configs and use it like the following:

import { mergeConfigs } from "apitool";
const config1 = {
  baseURL: ...
  headers: {},
  transformData: []
  transformResponse: []
  before: []
  after: []
  responseValidations: []
const config2 = {...};
const config3 = {...};
const config = mergeConfigs(config1, config2, config3)
const api = new Api(config);
const result = await api.get(path);

Importing things

All you can import from apitool is the following:

import Api, { Response, Context, ErrorType, mergeConfigs } from "apitool";


  1. Fork it!
  2. Create your feature branch: git checkout -b my-new-feature
  3. Commit your changes: git commit -am 'Add some feature'
  4. Push to the branch: git push origin my-new-feature
  5. Submit a pull request :D


Eunjae Lee, Released under the MIT License.




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