The original title is "Building a custom Contentful Rich Text editor: the round-trip problem"

Short summary

A detailed walkthrough of building a custom Contentful Rich Text editor using PlateJS/Slate, focusing on the hardest part: lossless bidirectional conversion between the editor's internal model and Contentful's stored JSON schema. The author deliberately mirrors node types and marks between the two systems so serialize/deserialize are thin lookup-table inverses, structurally guaranteeing round-trip fidelity. Real-world edge cases like empty nodes, void embeds, and Slate's child requirements are handled explicitly.

• •Round-trip fidelity (serialize(deserialize(doc)) === doc) is the core challenge of custom Contentful editors
• •Mirroring Plate node types to Contentful node types makes conversion a thin, structurally-guaranteed inverse mapping
• •Edge cases like empty nodes and void embeds require explicit handling to avoid silent content corruption

Generated with AI, which can make mistakes.