The Squarespace Developer Platform is an advanced customization tool for experienced developers to modify version 7.0 sites beyond standard customization options.

Who Should Use It? The Developer Platform is exclusively for advanced developers with expertise in HTML, LESS CSS, JSON-T, and Github. Most users should stick to Squarespace's built-in customization tools.

Key Capabilities:

• Create custom 7.0 templates from scratch
• Modify existing 7.0 templates
• Access markup resources, stylesheets, and scripts

Limitations:

• Cannot modify version 7.1 sites
• No access to CMS content
• Cannot add server-side code
• Cannot modify default scripts/styles
• Cannot customize blocks or landing pages

Important Changes After Enabling:

• Preloaded content disappears
• Template switching disabled
• No template updates from Squarespace
• Platform updates continue normally

Effects of Disabling Developer Mode:

• All custom code is removed
• Site reverts to default styles and settings
• Custom designs and integrations stop working
• Navigation resets to original order
• Custom blog post types revert to defaults
• Sidebar, header, and footer customizations disappear

Plan Requirements:

• Available on Business plan or higher
• Trial periods include full access
• Personal plan users cannot make changes in developer mode
• Switching to Personal plan preserves existing customizations but prevents new changes

Authentication: Create an application password if using two-step authentication or social media login.

Support: Squarespace support assists with platform activation but cannot help with custom code troubleshooting. Use the Squarespace Forum and developer documentation for coding help.

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