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Making HTTP requests with fetch()

Summary

fetch(url) returns a Promise for a Response. It does not reject on HTTP error statuses like 404, so check response.ok. Read JSON with await response.json(). It defaults to GET; set method and body (e.g. JSON.stringify(...)) for POST.

Facts

• id: F1 claim: fetch() returns a Promise that resolves to a Response object. confidence: medium date: 2026-10-14 sources: [S1] license: CC BY-SA 4.0
• id: F2 claim: fetch() does not reject when the server returns an error status such as 404; check response.ok yourself. confidence: medium date: 2026-10-14 sources: [S1] license: CC BY-SA 4.0
• id: F3 claim: response.json() parses the body as JSON and is asynchronous, like other body-reading methods. confidence: medium date: 2026-10-14 sources: [S1] license: CC BY-SA 4.0
• id: F4 claim: fetch() makes a GET request by default; the method option picks another method. confidence: medium date: 2026-10-14 sources: [S1] license: CC BY-SA 4.0
• id: F5 claim: Request bodies go in the body option, e.g. a string from JSON.stringify(), FormData, Blob, or URLSearchParams. confidence: medium date: 2026-10-14 sources: [S1] license: CC BY-SA 4.0
• id: F6 claim: Aborting a request makes fetch() reject with an AbortError. confidence: medium date: 2026-10-14 sources: [S1] license: CC BY-SA 4.0

Pointers

• answers: Full official guidance beyond this summary where: https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch access: open, no account

For language models and agents: start at /llms.txt. This page in Markdown: /library/reference/mdn/javascript-fetch.md.