Evernote Data Handling

Overview

Best practices for handling Evernote data including ENML content processing, attachment management, local database sync, and ENEX export/import.

Prerequisites

• Understanding of Evernote data model (Notes, Notebooks, Tags, Resources)
• Database for local storage (SQLite, PostgreSQL, etc.)
• File storage for attachments

Instructions

Step 1: Data Schema Design

Design a local database schema that mirrors Evernote's data model. Key tables: notes (guid, title, content, notebookGuid, created, updated, USN), notebooks (guid, name, stack), tags (guid, name), resources (guid, noteGuid, mime, hash, size). Track Update Sequence Numbers (USN) for incremental sync.

CREATE TABLE notes (
  guid TEXT PRIMARY KEY,
  title TEXT NOT NULL,
  content TEXT,
  notebook_guid TEXT REFERENCES notebooks(guid),
  created BIGINT,
  updated BIGINT,
  usn INTEGER DEFAULT 0
);

Step 2: ENML Content Processing

Parse ENML to extract plain text (strip tags), convert to HTML (replace with , resolve to / tags), or convert to Markdown. Validate ENML before sending to the API by checking for required declarations and forbidden elements.

function enmlToPlainText(enml) {
  return enml
    .replace(/<\?xml[^>]*\?>/g, '')
    .replace(/<!DOCTYPE[^>]*>/g, '')
    .replace(/<[^>]+>/g, ' ')
    .replace(/\s+/g, ' ')
    .trim();
}

const syncState = await noteStore.getSyncState();
if (syncState.updateCount > lastSyncUSN) {
  const chunk = await noteStore.getSyncChunk(lastSyncUSN, 100, true);
  // Process chunk.notebooks, chunk.tags, chunk.notes, chunk.resources
}

For the complete data schema, sync manager, ENML processor, and export implementations, see Implementation Guide.

Output

• SQL schema for local Evernote data storage
• ENML-to-text and ENML-to-HTML converters
• Resource download and local storage manager
• Incremental sync engine using USN tracking
• ENEX, JSON, and Markdown export utilities

Error Handling

Resources

• Evernote Data Model
• ENML Reference
• Synchronization
• ENEX Export Format

Next Steps

For enterprise features, see evernote-enterprise-rbac.

Examples

Local mirror: Sync all notes to a local SQLite database using incremental sync. Store resources on disk keyed by MD5 hash. Use the local mirror for full-text search without API calls.

Markdown export: Convert all notes in a notebook to Markdown files, preserving folder structure from notebook stacks, and saving attachments to an assets/ directory.