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
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<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

Hendridev

HDEV Import / Export Post lets you move posts between WordPress sites without losing their images. Export a post type to a single portable JSON file, then import that file on a local server or another production site.
During import, every featured image, in-content image and post attachment is downloaded from the source site into the destination site’s own media library, and the image URLs inside the post content are rewritten to point at the newly downloaded copies. Nothing keeps pointing back at the old site.
Re-importing the same file is safe: existing posts are updated in place instead of duplicated, and media that was already downloaded is reused instead of downloaded again.
Both export and import run in small batches with a live progress bar, so large jobs do not time out and you always see what is happening.
Export features:
<ul>
<li>Export any public post type (Posts, Pages and custom post types)</li>
<li>Filter by post status (published, draft, pending, private, scheduled or all)</li>
<li>Filter by date range — the month list is detected automatically from the existing content of the selected post type and refreshes when you switch post types</li>
<li>Filter by author — the dropdown lists only users who have actually authored content on the site</li>
<li>Optionally include the media attached to each post</li>
<li>Single portable JSON file — easy to move between sites</li>
<li>Live progress bar while the export runs, then the file downloads automatically</li>
</ul>
Import features:
<ul>
<li>Featured images, in-content images and post attachments are downloaded into the destination site’s media library</li>
<li>In-content image URLs are automatically rewritten to the new local URLs</li>
<li>Update existing posts instead of creating duplicates — posts are matched by slug and post type, so the same file can be imported again safely</li>
<li>Already-downloaded media is detected and reused, so re-imports never fill the media library with copies</li>
<li>Works between local development sites (Local, <code>.local</code> / <code>.test</code> domains) as well as production domains</li>
<li>Taxonomy terms (categories, tags and custom taxonomies) and post meta are preserved</li>
<li>Missing categories are created automatically, including the full parent/child hierarchy</li>
<li>Assign every imported post to a user of your choice, or keep the original author when a matching username exists</li>
<li>Optional: import all posts as drafts</li>
<li>Live progress bar with a per-post log — successful posts, reused/downloaded media counts, and clear warnings when a media download fails</li>
</ul>
General:
<ul>
<li>No new database tables — uses the standard WordPress APIs</li>
<li>Admin-only: every action requires the <code>manage_options</code> capability and is protected by nonces</li>
</ul>

HDEV Import / Export Post

Export posts to a JSON file and import them elsewhere, downloading featured images, content images and attachments to the destination site.

cm4all-wp-impex vs HDEV Import / Export Post