cm4all

ImpEx is a WordPress plugin that allows you to import and export data from and to your WordPress installation.
The primary goal for ImpEx is to provide a true Open Source WordPress Plugin for importing/exporting your WordPress data (including data from third-party plugins/themes).
This plugin is in an early (but working) stage.
Impex provides :
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WordPress hooks for third-party plugins to expose their own data to ImpEx Import / Export without being dependent on Impex.
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a (semi) streaming architecture for large data exports/imports.
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Definition of configurable import/export profiles defining data providers to use and configuration of these data providers
<ul>
<li>A user interface for importing / exporting data via ImpEx WP admin screen</li>
</ul>
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the ImpEx API is designed to support resumable/cancelable imports and exports.
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ImpEx provides a REST API integrated into WordPress
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ImpEx is explicitly designed for use in managed WordPress instances
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ImpEx development relies heavily on PHP unit testing its feature set to be stable and consistent.
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a <a href="https://ionos-wordpress.github.io/cm4all-wp-impex/impex-cli.html" rel="nofollow ugc">CLI</a> for importing/exporting data via ImpEx REST interface. 
The ImpEx CLI can be used as an alternative to the ImpEx WP admin screen.
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related NPM package <a href="https://www.npmjs.com/package/@cm4all-wp-impex/generator" rel="nofollow ugc">@cm4all-wp-impex/generator</a> enabling transformation of any content to Impex Export format.
Using this package you’re able to convert any content to WordPress and import it using the ImpEx plugin. See the <a href="https://ionos-wordpress.github.io/cm4all-wp-impex/cm4all-wp-impex-generator/static-website-tutorial.html" rel="nofollow ugc">Tutorial</a> 
or <a href="https://www.youtube.com/watch?v=pjG69RmULYo" rel="nofollow ugc">watch the walk-trough at YouTube</a>.
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</ul>
Your help is welcome !!

cm4all-wp-impex

ImpEx contributes extendable Import / Export functionality to WordPress

Kyle Mott

This plugin is installed on an external source WordPress site and handles:
<ul>
<li>Configuration and destination site selection</li>
<li>Source-side validation and preflight checks</li>
<li>Scanning source files and database</li>
<li>Exporting data in streamed, memory-bounded chunks</li>
<li>Uploading chunks directly to S3 via presigned URLs</li>
<li>Notifying the HonestHosting backend when the import is ready</li>
<li>Resuming interrupted migrations</li>
<li>Optional scheduled incremental sync via WP-Cron</li>
</ul>
<h3>External services</h3>
This plugin relies on two third-party services to perform site migrations to HonestHosting. Both are only contacted after the site administrator explicitly configures an import key and initiates a migration action from the plugin admin UI.
<h4>HonestHosting API (api.honesthosting.io)</h4>
The plugin communicates with the HonestHosting backend API at <code>https://api.honesthosting.io</code> to authenticate the site administrator’s import key, enumerate eligible destination sites, obtain presigned S3 upload URLs, submit preflight estimates, and signal that the destination is ready to import.
What data is sent and when:
<ul>
<li>When the administrator validates an import key or loads the migration UI: the import key and source site URL.</li>
<li>During preflight: source PHP version, estimated <code>wp-content</code> total size and file count, database table summaries (table names, estimated row counts and byte sizes, engine types), and detected hosting-environment capabilities.</li>
<li>During export: session identifiers, chunk manifests, file paths and sizes, database table progress, and hash values used to validate uploaded chunks.</li>
<li>When upload completes: an import-ready signal containing the session metadata and destination site identifier.</li>
</ul>
The import key is sent in the <code>X-HH-Site-Import-Key</code> request header over HTTPS.
This service is provided by HonestHosting:
<ul>
<li>Terms and Conditions: https://www.honesthosting.io/terms-and-conditions/</li>
<li>Privacy Policy: https://www.honesthosting.io/privacy-policy/</li>
</ul>
<h4>Amazon S3 (presigned upload URLs)</h4>
The plugin uploads file and database export chunks directly to Amazon S3 using presigned <code>PUT</code> URLs issued by the HonestHosting backend. Payloads are not proxied through the HonestHosting API; they are transmitted straight from the source site to S3 over HTTPS.
What data is sent and when:
<ul>
<li>During export: each chunk body is <code>PUT</code> to the presigned S3 URL. File chunks contain raw file bytes from <code>wp-content/</code>; database chunks contain SQL INSERT statements generated from the site’s database tables. Requests carry only <code>Content-Type</code> and <code>Content-Length</code> headers — authentication is embedded in the presigned URL itself, so no account credentials or import keys are sent to S3.</li>
</ul>
The S3 buckets used for migration storage are operated by HonestHosting on Amazon Web Services. AWS terms and privacy documents apply to the underlying transport and storage:
<ul>
<li>AWS Service Terms: https://aws.amazon.com/service-terms/</li>
<li>AWS Privacy Notice: https://aws.amazon.com/privacy/</li>
</ul>

HonestHosting Site Migrator

Migrate WordPress sites to HonestHosting via streamed, chunked, resumable exports.

cm4all-wp-impex vs HonestHosting Site Migrator