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From ACF page:
Local JSON is a new feature added in version 5 which saves field group and field settings as .json files within your theme. The idea is similar to caching, and both dramatically speeds up ACF and allows for version control over your field settings!
This plugin require Advanced Custom Fields or Advanced Custom Fields Pro plugin to work.
Installation:
<ol>
<li>Upload the plugin files to the <code>/wp-content/plugins/plugin-name</code> directory, or install the plugin through the WordPress plugins screen directly.</li>
<li>Activate the plugin through the ‘Plugins’ screen in WordPress</li>
<li>Update all field groups (open group and press “Update” button)</li>
<li>That’s all folks!</li>
</ol>

Local JSON in uploads for ACF

Boost Advanced Custom Fields speed by enabling json caching

xfive

“The man who makes the best use of his time is the one who will be able to offer the most help to others.” – <a href="https://en.wikipedia.org/wiki/Republic_(Plato)" rel="nofollow ugc">Plato, The Republic</a>
xfive Plato – Reliable Sync Watcher for ACF is designed for teams of developers collaborating on WordPress projects that use ACF’s <code>acf-json</code> feature.
This plugin monitors your local JSON files for any Advanced Custom Fields (ACF) field groups that are out of sync with the site’s database and displays a clear, timely notice when discrepancies are detected. This helps prevent accidental overwrites, missed updates, and frustrating merge conflicts during development.
You’ll still have the option to ignore the warning if needed—but only proceed if you’re confident in what you’re doing and understand the risks of overriding field group data!
Whether you’re working solo or as part of a team, xfive Plato – Reliable Sync Watcher for ACF adds a simple but powerful layer of protection to your ACF workflow—so you can code with confidence and keep your field groups in harmony.
<h3>SUPPORT</h3>
Having issues with the plugin? Contact us through the <a href="https://www.xfive.co/contact/" rel="nofollow ugc">website</a>.

xfive Plato – Reliable Sync Watcher for ACF

Monitors ACF's acf-json for unsynced field groups and warns you of potential database conflicts during development.

Local JSON in uploads for ACF vs xfive Plato – Reliable Sync Watcher for ACF