nuxt-axios-duplicate-blocker

Nuxt module that adds axios interceptors in order to block duplicate API requests and return results from the latest request to all callee functions. It can also be optionally used to cancel active requests when switching between pages.

How it works

Using axios interceptors, each axios request generates a requestKey that serves as an Identifier for this request. By default this requestKey is based on its url and parameter names (not values). You can also specify your own requestKey if the default does not suit your needs (see Axios Request Configuration Options bellow)

When a new request is made that has the same requestKey with an active request, the active request is canceled returning a promise pointing to the new request. When that request finishes it resolves the promise, so all previously canceled requests now return the latest results back to their caller functions.

Also, all active requests are cancelled by default when switching between pages. You can change this behaviour from the module options (see Module Options bellow)

Setup

• Add nuxt-axios-duplicate-blocker dependency to your project using yarn or npm
• Add nuxt-axios-duplicate-blocker to modules section of nuxt.config.js

❗ IMPORTANT: Add it BEFORE including the axios module in nuxt.config.js

{
  modules: [
    // Simple usage
    'nuxt-axios-duplicate-blocker',

    // With options
    ['nuxt-axios-duplicate-blocker', { /* module options */ }],
    
    // Axios module must be added AFTER 'nuxt-axios-duplicate-blocker'
    '@nuxtjs/axios'
 ]
}

Module Options

Option	Type	Default	Description
debug	Boolean	this.options.dev (true for development false for production)	If set to true it will always show a warning in console whenever a request has been blocked.
onPageChange	Boolean	true	If set to true all active API requests will be canceled when switching pages.
blockByDefault	Boolean	true	Sets the default policy for blocking requests. If set to true all requests will be blocked unless specified otherwise in the request configuration of a call with the blockAllowed option.
headerBlockerKey	String	<empty>	Set the key in headers section of Axios's request configuration, to be used as the container of the request configuration options for this module. Read the important note below for more details.

Axios Request Configuration Options

❗ Please read the note below if these options do not work.

Option	Type	Default	Description
requestKey	String	url:parameterName1|parameterName2|...	You can optionally provide a custom request key for specifying requests that should not block each other by adding an ID to a configuration object for an axios call.
blockAllowed	Boolean	true	You can optionally use this parameter to override the default policy for blocking requests, set in module options with blockByDefault.

Example:

await this.$axios.$get('/example-api/example', {
    params: { ... },
    requestKey: 'customRequestKeyName',
    blockAllowed: false
});

❗ IMPORTANT NOTE

In version 0.19.0, axios module introduced a breaking change that disallows extra parameters to be added in the request configuration object. There is a ticket about this issue here and a fix but it has not been officially released by the time of this writing.

Until the official release of this fix, in order to make the custom request options for this module work again, you must set the headerBlockerKey property in Module Options to a string that will be used for passing them as a property in the headers section of the Request Configuration Options. This property will be deleted from the headers section before the request is sent.

Example:

In nuxt.config.js

{
  modules: [
    ['nuxt-axios-duplicate-blocker', {
        headerBlockerKey: 'blocker'
    }]
 ]
}

In the axios call:

await this.$axios.$get('/example-api/example', {
    params: { ... },
    headers: { 
        blocker: {
            requestKey: 'customRequestKeyName',
            blockAllowed: false
        }
    }
});

This feature will be removed in the next major release of this module so use the ^ sign, in your package.json dependency in order to avoid compatibility issues.

License

MIT License

Copyright (c) Marios Vertopoulos