Error: The property 'slice' cannot be read from an undefined value

Question

Error: The property 'slice' cannot be read from an undefined value

I am currently working on a prototype recipe app called Forkify, which is being developed using Javascript, NPM, Babel, and Webpack. In this project, I am utilizing a custom API.
API URL : forkify-api.herokuapp.com

TO SEARCH RESULT

This API returns a list of recipes based on a specific query.

Path:

Example URL:

GET

This endpoint retrieves details about a specific recipe.

Path:

Example URL:

While running the project from the command line with the command npm start run, I encountered an error when trying to search for "pizza" in the input box (refer to the attached images).

Below are the key code files :

index.js

(Code snippet provided)

Search.js

(Code snippet provided)

searchView.js

(Code snippet provided)

Recipe.js

(Code snippet provided)

base.js

(Code snippet provided)

Can anyone provide a solution?

javascript npm webpack babeljs

Answer 1

Answer №1

The await keyword is crucial in your axios call within the file Search.js:

const res = await axios(`https://forkify-api.herokuapp.com/api/search?q=${this.query}`);
this.result = res.data.recipes;

The absence of this keyword leads to the following error message:

TypeError: Cannot read property 'recipes' of undefined

Subsequently, passing undefined to renderResults triggers another console error:

TypeError: Cannot read property 'slice' of undefined

To prevent such errors, you can set a default value of an empty array for the recipes parameter in order for slice to function correctly even if undefined is provided:

export const renderResults = (recipes = [], page = 1, resPerPage = 10) => {
  // ...
}

Answer 2

The await keyword is crucial in your axios call within the file Search.js:

const res = await axios(`https://forkify-api.herokuapp.com/api/search?q=${this.query}`);
this.result = res.data.recipes;

The absence of this keyword leads to the following error message:

TypeError: Cannot read property 'recipes' of undefined

Subsequently, passing undefined to renderResults triggers another console error:

TypeError: Cannot read property 'slice' of undefined

To prevent such errors, you can set a default value of an empty array for the recipes parameter in order for slice to function correctly even if undefined is provided:

export const renderResults = (recipes = [], page = 1, resPerPage = 10) => {
  // ...
}

Error: The property 'slice' cannot be read from an undefined value

Answer №1

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