Overview
The 4chan API provides read-only, public access to boards, threads, and posts on 4chan with no authentication required. You can retrieve thread lists, individual posts, and board catalogs in JSON format. It is a great beginner-friendly API for learning how to parse JSON responses and build a simple reader app.
Beginner Tip
The 4chan API has strict rate limits — wait at least 1 second between requests to the same board and at least 10 seconds between full thread list fetches. Ignoring this will get your IP temporarily banned.
Available Data
The kind of data this API exposes, based on its documentation. We could not call the endpoint to confirm the exact field names.
Example Response
Illustrative shape only — we were not able to call this endpoint (it requires credentials or exposes no public sample URL), so the fields below show the kind of data this API returns rather than a recorded response.
{
"page": 1,
"threads": [
{
"no": 123456789,
"sub": "Example Thread",
"com": "Discussion content...",
"time": 1705320000,
"replies": 42
}
]
} Field Reference
no Unique post number within the board, used to reference individual posts. com HTML-encoded body text of the post comment. sub Subject line of the thread, only present on the opening post if set. tim Unix timestamp used as part of the filename for any image attached to the post. replies Number of replies the thread has received. images Number of image replies in the thread. Implementation Example
Calls a real endpoint of this API. Replace any placeholder credentials with your own key.
const url = "https://a.4cdn.org/g/catalog.json";
const response = await fetch(url);
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data); What Can You Build?
Note: These code examples are AI-generated and unverified. Always refer to the official API documentation for accurate usage.
Common Errors & Troubleshooting
Generated guidance based on this API's documentation, not observed by us. Treat it as a starting point and check against the provider's own error reference.
Metadata Score Breakdown
Estimated from metadata — endpoint not independently tested
Metadata estimate · endpoint not independently tested
Technical Specifications
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