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React Native Academy · Lección

POST, PUT y DELETE con Axios

Envíe datos a una API mediante Axios POST y PUT, gestione la respuesta para actualizar el estado local e implemente una acción de eliminación que quite un elemento tanto del servidor como de la lista.

POST, PUT y DELETE con Axios es una lección gratuita de React Native Academy en CoddyKit. Esta es la lección 4 de 4. Puedes leer la lección completa abajo gratuitamente — luego la practicas en el navegador con un editor de código integrado y un tutor de IA 24/7. Forma parte de la ruta de aprendizaje de React Native Academy, y tu progreso se sincroniza en la web y la app de CoddyKit. El curso de React Native Academy incluye 4 lecciones en total.

Partes de esta lección aún no han sido traducidas y se muestran en inglés.

CRUD Operations with Axios

Beyond fetching data, most apps need to create, update, and delete resources on a server. Axios provides axios.post, axios.put, axios.patch, and axios.delete methods that map directly to HTTP verbs. Each method returns a Promise resolving to the server's response.

POST: Creating a New Resource

axios.post(url, data) sends a request body as JSON to create a new resource. The second argument is the request body object — Axios automatically serializes it to JSON and sets the Content-Type: application/json header. The server typically responds with the created resource including its assigned ID.

const createPost = async (title, body) => {
  const response = await axios.post(
    'https://jsonplaceholder.typicode.com/posts',
    { title, body, userId: 1 }
  );
  console.log('Created:', response.data);
  // { id: 101, title: '...', body: '...', userId: 1 }
  return response.data;
};

Adding a New Item to State After POST

After a successful POST, add the returned item to your local state array to reflect the creation without a full re-fetch. Use the functional form of setState to safely merge the new item with the existing array. The server-assigned ID is used as the unique key in subsequent renders.

const handleCreate = async (formData) => {
  try {
    const response = await axios.post('/posts', formData);
    const newPost = response.data;
    setPosts((prev) => [newPost, ...prev]);
  } catch (err) {
    setError('Failed to create post');
  }
};

PUT: Replacing a Full Resource

axios.put(url, data) replaces an entire resource with the provided data. Include the resource's ID in the URL and send all fields in the body. PUT is idempotent — calling it multiple times with the same data produces the same result. Use PUT when you are replacing the complete resource, not just updating a few fields.

const updatePost = async (postId, updatedData) => {
  const response = await axios.put(
    '/posts/' + postId,
    updatedData
  );
  return response.data;
};

PATCH: Partial Update

axios.patch(url, data) sends only the changed fields instead of the entire resource. This is more efficient than PUT when you are updating a single field (like a user's avatar or a post's title). Many REST APIs support both PUT and PATCH — check the API documentation to see which one is expected.

// Only update the title, leave other fields untouched
const patchPostTitle = async (postId, newTitle) => {
  const response = await axios.patch(
    '/posts/' + postId,
    { title: newTitle }
  );
  return response.data;
};

Updating State After PUT/PATCH

After a successful update, replace the old item in the state array with the server's returned version. Use Array.map to iterate over the state and swap the matching item. This keeps the local state in sync with the server without a full re-fetch.

const handleUpdate = async (postId, updatedData) => {
  try {
    const response = await axios.put('/posts/' + postId, updatedData);
    const updatedPost = response.data;
    setPosts((prev) =>
      prev.map((p) => (p.id === postId ? updatedPost : p))
    );
  } catch (err) {
    setError('Failed to update post');
  }
};

DELETE: Removing a Resource

axios.delete(url) removes the resource at the given URL. Most APIs return a 200 or 204 (No Content) response on successful deletion. Unlike POST and PUT, DELETE does not send a request body. The third argument to axios.delete can pass config options like auth headers.

const deletePost = async (postId) => {
  await axios.delete('/posts/' + postId);
  console.log('Post deleted');
};

Removing the Item from State After DELETE

After a successful DELETE, filter the item out of your local state array with Array.filter. The UI updates immediately without a round-trip to re-fetch the full list. If the DELETE fails, the error is caught and the item remains in state — showing the user an error message.

const handleDelete = async (postId) => {
  try {
    await axios.delete('/posts/' + postId);
    setPosts((prev) => prev.filter((p) => p.id !== postId));
  } catch (err) {
    setError('Failed to delete post');
  }
};

Optimistic Updates

Optimistic updates update the local state immediately (before the server confirms) to make the UI feel instant. If the request fails, revert to the original state and show an error. This pattern is used by Twtter's like button and Gmail's delete — the action feels instant even over a slow connection.

const handleDelete = async (postId) => {
  const originalPosts = posts;
  // Update immediately
  setPosts((prev) => prev.filter((p) => p.id !== postId));
  try {
    await axios.delete('/posts/' + postId);
  } catch (err) {
    // Revert on failure
    setPosts(originalPosts);
    setError('Delete failed. Please try again.');
  }
};

Uploading Files with FormData

To upload an image or file via POST, create a FormData object, append the file using the React Native URI format, and pass it to axios.post. Set the Content-Type header to multipart/form-data so the server parses it correctly as a file upload rather than JSON.

const uploadAvatar = async (imageUri) => {
  const formData = new FormData();
  formData.append('avatar', {
    uri: imageUri,
    name: 'avatar.jpg',
    type: 'image/jpeg',
  });

  const response = await axios.post('/user/avatar', formData, {
    headers: { 'Content-Type': 'multipart/form-data' },
  });
  return response.data.avatarUrl;
};

Chaining Mutations: Create Then Navigate

After a successful POST or PUT, you often want to navigate the user to the newly created resource's detail screen. Chain the navigation call after the state update in the success path of your try/catch. Pass the new resource's ID or the full object as navigation params.

const handleCreatePost = async (formData) => {
  try {
    const response = await axios.post('/posts', formData);
    const newPost = response.data;
    setPosts((prev) => [newPost, ...prev]);
    navigation.navigate('PostDetail', { postId: newPost.id });
  } catch (err) {
    setError('Failed to create post');
  }
};

Quick Check

Test your understanding of POST, PUT, and DELETE requests with Axios from this lesson.

Lesson Recap

In this lesson you learned: axios.post sends a JSON body to create a resource and returns the created item from the server, axios.put/patch replaces or partially updates a resource — update state with Array.map after success, and axios.delete removes a resource — update state with Array.filter and use optimistic updates for a snappy UX. Next up we explore Redux Toolkit for managing complex application state.

Preguntas frecuentes

¿La lección «POST, PUT y DELETE con Axios» es gratis?

Sí — el texto completo de «POST, PUT y DELETE con Axios» es gratis para leer aquí en la web. Para practicarla de forma interactiva (editor de código integrado y tutor de IA 24/7) y desbloquear el resto del curso de React Native Academy, actualiza a CoddyKit PRO. El curso de React Native Academy incluye 4 lecciones en total.

¿Qué aprenderé en «POST, PUT y DELETE con Axios»?

Envíe datos a una API mediante Axios POST y PUT, gestione la respuesta para actualizar el estado local e implemente una acción de eliminación que quite un elemento tanto del servidor como de la lista. Practicas React Native Academy con código real que ejecutas directamente en el navegador, y un tutor de IA 24/7 responde tus preguntas mientras trabajas en la lección.

¿Necesito experiencia previa para empezar React Native Academy?

No se requiere experiencia previa. React Native Academy en CoddyKit está estructurado para principiantes hasta estudiantes avanzados, así que puedes empezar aquí o desde el inicio y avanzar a tu ritmo. Esta es la lección 4 de 4.

¿Cuánto tiempo toma la lección «POST, PUT y DELETE con Axios»?

La mayoría de las lecciones de CoddyKit toman alrededor de 5–10 minutos. Cada una es compacta e interactiva, así que avanzas constantemente y retomas exactamente por donde dejaste en la web y la app.

¿Puedo escribir y ejecutar código en esta lección de React Native Academy?

Sí. Cada lección de React Native Academy incluye un editor de código integrado, así que escribes y ejecutas código real directamente en tu navegador y obtienes retroalimentación instantánea de IA — sin configuración local necesaria.

Todas las lecciones de este curso

  1. El hook useEffect y los arrays de dependencias
  2. Realización de solicitudes GET con Axios
  3. Gestión de los estados de carga y error
  4. POST, PUT y DELETE con Axios
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