---
title: "Get knowledge graph data"
method: GET
path: "/reader/knowledge"
tags: ["Reader"]
---

# Get knowledge graph data

`GET /reader/knowledge`

Returns concept tags and edges for the current user's knowledge network

## Query parameters

- `book_id` string
- `since` integer

## Response `200`

Knowledge graph with server timestamp

- object
  - `edges` SchemaConceptEdge[]
    - `ctime` integer
    - `id` integer
    - `reason` string
    - `source_id` integer
    - `target_id` integer
    - `user_id` integer
    - `weight` number
  - `nodes` SchemaConceptTag[]
    - `book_id` string
    - `ctime` integer
    - `id` integer
    - `name` string
    - `note_id` integer
    - `source` string
    - `user_id` integer
  - `server_time` integer

## Other responses

- `500` — Internal Server Error

## Changes

- **2026-04-23** `20e19d9cbb5a` — 1 info
  - endpoint added
- **2026-03-21** `ffed97aaec4f` — 1 breaking
  - api path removed without deprecation

[Change history](https://skmtc.dev/lxpio/apis/omnigram-api/changes/reader/knowledge/get.md)

---

[API](https://skmtc.dev/lxpio/apis/omnigram-api.md) · [All operations](https://skmtc.dev/lxpio/apis/omnigram-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/lxpio/omnigram-api/revisions/58911ffb3093/schema)