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4chan

4chan Indexes API

Per-board, per-page index document of threads (each with a posts array including the OP and a small number of preview replies).

Documentation Provider Profile APIs.io OpenAPI GitHub

4chan Indexes API is one of 6 APIs that 4chan publishes on the APIs.io network, described by a machine-readable OpenAPI specification.

Tagged areas include Indexes. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, and a support channel.

This API exposes 1 operation across 1 path, and defines 3 schemas. It is described by OpenAPI 3.2.0, at version 2026-05-28.

Requests are made against 2 base URLs: https://a.4cdn.org, http://a.4cdn.org.

1 operations 1 paths 3 schemas 1 GET

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.2.0
API Version
2026-05-28
Base URL
https://a.4cdn.org
Contact
4chan API
License
4chan API Terms of Service
Terms of Service
View terms
Resource Areas
1

Paths & Operations 1

Across 1 path, the API surfaces 1 operation — 1 GET. Each is listed below with its method, path, parameters, and response codes.

Indexes 1

Per-board, per-page index document of threads (each with a posts array including the OP and a small number of preview replies).

GET
/{board}/{page}.json
4chan Get Board Index Page
getBoardIndexPage 2 params → 200304404503

Schemas 3

The contract defines 3 schemas that model the data the API accepts and returns. The most detailed are Post (43 properties), IndexPageResponse (1 property), IndexPageThread (1 property). Each schema is shown below with its type and property counts.

Post
object
A single post — either an OP (when resto == 0) or a reply (when resto is the OP id). Many fields appear only on OPs (replies, images, sticky, closed, archived,…
43 properties 5 required
IndexPageThread
object
Wrapper around the posts visible for one thread inside an index-page response.
1 property 1 required
IndexPageResponse
object
Top-level response from /{board}/{page}.json.
1 property 1 required

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

4chan-indexes-api-openapi.yml Raw ↑

Other APIs 4chan publishes across the network.

4chan Archive API
AE Profile APIs.io
4chan Boards API
AE Profile APIs.io
4chan Catalog API
AE Profile APIs.io
4chan Threadlist API
AE Profile APIs.io
4chan Threads API
AE Profile APIs.io
#Indexes
← Back to 4 APIs
API Details
ID
4chan:4chan-indexes-api
Base URL
https://a.4cdn.org
Docs
https://github.com/4chan/4chan-API
Provider
4chan
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