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Strapi Client

The Strapi Client library simplifies interactions with your Strapi back end, providing a way to fetch, create, update, and delete content. This guide walks you through setting up the Strapi Client, configuring authentication, and using its key features effectively.

Getting Started​

Prerequisites
  • A Strapi project has been created and is running. If you haven't set one up yet, follow the Quick Start Guide to create one.
  • You know the URL of the Content API of your Strapi instance (e.g., http://localhost:1337/api).

Installation​

To use the Strapi Client in your project, install it as a dependency using your preferred package manager:

yarn add @strapi/client

Basic configuration​

To start interacting with your Strapi back end, initialize the Strapi Client and set the base API URL:

With Javascript, import the strapi function and create a client instance:

import { strapi } from '@strapi/client';

const client = strapi({ baseURL: 'http://localhost:1337/api' });

The baseURL must include the protocol (http or https). An invalid URL will throw an error StrapiInitializationError.

Authentication​

The Strapi Client supports different authentication strategies to access protected resources in your Strapi back end.

If your Strapi instance uses API tokens, configure the Strapi Client as follows:

const client = strapi({
  baseURL: 'http://localhost:1337/api',
  auth: 'your-api-token-here',
});

This allows your requests to include the necessary authentication credentials automatically. If the token is invalid or missing, the client will throw an error during initialization StrapiValidationError.

API Reference​

The Strapi Client provides the following key properties and methods for interacting with your Strapi back end:

ParameterDescription
baseURLThe base API URL of your Strapi back end.
fetch()A utility method for making generic API requests similar to the native fetch API.
collection()Manages collection-type resources (e.g., blog posts, products).
single()Manages single-type resources (e.g., homepage settings, global configurations).
files()Enables upload, retrieve and management of files directly to/from the Strapi Media Library.

General purpose fetch​

The Strapi Client provides access to the underlying JavaScript fetch function to make direct API requests. The request is always relative to the base URL provided during client initialization:

const result = await client.fetch('articles', { method: 'GET' });

Working with collection types​

Collection types in Strapi are entities with multiple entries (e.g., a blog with many posts). The Strapi Client provides a collection() method to interact with these resources, with the following methods available:

ParameterDescription
find(queryParams?)Fetch multiple documents with optional filtering, sorting, or pagination.
findOne(documentID, queryParams?)Retrieve a single document by its unique ID.
create(data, queryParams?)Create a new document in the collection.
update(documentID, data, queryParams?)Update an existing document.
delete(documentID, queryParams?)Update an existing document.

Usage examples:

const articles = client.collection('articles');

// Fetch all english articles sorted by title
const allArticles = await articles.find({
  locale: 'en',
  sort: 'title',
});

// Fetch a single article
const singleArticle = await articles.findOne('article-document-id');

// Create a new article
const newArticle = await articles.create({ title: 'New Article', content: '...' });

// Update an existing article
const updatedArticle = await articles.update('article-document-id', { title: 'Updated Title' });

// Delete an article
await articles.delete('article-id');

Working with single types​

Single types in Strapi represent unique content entries that exist only once (e.g., the homepage settings or site-wide configurations). The Strapi Client provides a single() method to interact with these resources, with the following methods available:

ParameterDescription
find(queryParams?)Fetch the document.
update(documentID, data, queryParams?)Update the document.
delete(queryParams?)Remove the document.

Usage examples:

const homepage = client.single('homepage');

// Fetch the default homepage content
const defaultHomepage = await homepage.find();

// Fetch the Spanish version of the homepage
const spanishHomepage = await homepage.find({ locale: 'es' });

// Update the homepage draft content
const updatedHomepage = await homepage.update(
  { title: 'Updated Homepage Title' },
  { status: 'draft' }
);

// Delete the homepage content
await homepage.delete();

Working with files​

The Strapi Client provides access to the Media Library via the files property. This allows you to retrieve and manage file metadata without directly interacting with the REST API.

The following methods are available for working with files. Click on the method name in the table to jump to the corresponding section with more details and examples:

MethodDescription
find(params?)Retrieves a list of file metadata based on optional query parameters
findOne(fileId)Retrieves the metadata for a single file by its ID
update(fileId, fileInfo)Updates metadata for an existing file
upload(file, options)Uploads a file (Blob or Buffer) with an optional options object for metadata
delete(fileId)Deletes a file by its ID

find​

The strapi.client.files.find() method retrieves a list of file metadata based on optional query parameters.

The method can be used as follows:

// Initialize the client
const client = strapi({
  baseURL: 'http://localhost:1337/api',
  auth: 'your-api-token',
});

// Find all file metadata
const allFiles = await client.files.find();
console.log(allFiles);

// Find file metadata with filtering and sorting
const imageFiles = await client.files.find({
  filters: {
    mime: { $contains: 'image' }, // Only get image files
    name: { $contains: 'avatar' }, // Only get files with 'avatar' in the name
  },
  sort: ['name:asc'], // Sort by name in ascending order
});

findOne​

The strapi.client.files.findOne() method retrieves the metadata for a single file by its id.

The method can be used as follows:

// Initialize the client
const client = strapi({
  baseURL: 'http://localhost:1337/api',
  auth: 'your-api-token',
});

// Find file metadata by ID
const file = await client.files.findOne(1);
console.log(file.name);
console.log(file.url); 
console.log(file.mime); // The file MIME type

update​

The strapi.client.files.update() method updates metadata for an existing file, accepting 2 parameters, the fileId, and an object containing options such as the name, alternative text, and caption for the media.

The methods can be used as follows:

// Initialize the client
const client = strapi({
  baseURL: 'http://localhost:1337/api',
  auth: 'your-api-token',
});

// Update file metadata
const updatedFile = await client.files.update(1, {
  name: 'New file name',
  alternativeText: 'Descriptive alt text for accessibility',
  caption: 'A caption for the file',
});

upload NewThis content is new.​

The Strapi Client provides media file upload functionality through the FilesManager, accessible through the strapi.client.files.upload() method. The method allows you to upload media files (such as images, videos, or documents) to your Strapi backend.

The method supports uploading files as Blob (in browsers or Node.js) or as Buffer (in Node.js only). The method also supports attaching metadata to the uploaded file, such as alternativeText and caption.

Method Signature​
async upload(file: Blob, options?: BlobUploadOptions): Promise<MediaUploadResponse>
async upload(file: Buffer, options: BufferUploadOptions): Promise<MediaUploadResponse>
  • For Blob uploads, options is optional and may include fileInfo for metadata.
  • For Buffer uploads, options must include filename and mimetype, and may include fileInfo.

The response is an array of file objects, each containing details such as id, name, url, size, and mime source.

You can upload a file use through the browser as follows:

const client = strapi({ baseURL: 'http://localhost:1337/api' });

const fileInput = document.querySelector('input[type="file"]');
const file = fileInput.files[0];

try {
  const result = await client.files.upload(file, {
    fileInfo: {
      alternativeText: 'A user uploaded image',
      caption: 'Uploaded via browser',
    },
  });
  console.log('Upload successful:', result);
} catch (error) {
  console.error('Upload failed:', error);
}
Response Structure​

The strapi.client.files.upload() method returns an array of file objects, each with fields such as:

{
  "id": 1,
  "name": "image.png",
  "alternativeText": "Uploaded from Node.js Buffer",
  "caption": "Example upload",
  "mime": "image/png",
  "url": "/uploads/image.png",
  "size": 12345,
  "createdAt": "2025-07-23T12:34:56.789Z",
  "updatedAt": "2025-07-23T12:34:56.789Z"
}
Additional response fields

The upload response includes additional fields beyond those shown above. See the complete FileResponse interface in the client source code for all available fields.

delete​

The strapi.client.files.delete() method deletes a file by its ID.

The method can be used as follows:

// Initialize the client
const client = strapi({
  baseURL: 'http://localhost:1337/api',
  auth: 'your-api-token',
});

// Delete a file by ID
const deletedFile = await client.files.delete(1);
console.log('File deleted successfully');
console.log('Deleted file ID:', deletedFile.id);
console.log('Deleted file name:', deletedFile.name);

Handling Common Errors​

The following errors might occur when sending queries through the Strapi Client:

ErrorDescription
Permission ErrorsIf the authenticated user does not have permission to upload or manage files, a FileForbiddenError is thrown.
HTTP ErrorsIf the server is unreachable, authentication fails, or there are network issues, an HTTPError is thrown.
Missing ParametersWhen uploading a Buffer, both filename and mimetype must be provided in the options object. If either is missing, an error is thrown.
Additional information

More details about the Strapi Client may be found in the package's README.

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