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2.1.0-pre.6 • Public • Published

JSON Fetch

A drop-in replacements for fetch, Request, and Response with first class support for JSON objects.

Unlike other HTTP libraries, this one stays as close as possible to the original Fetch API, while improving the ergonomics the most common use case:


const response = await fetch('/some', { 
  method: 'POST',
  body: JSON.stringify(json), 
  headers: {
    'Content-Type': 'application/json',


import { JSONRequest } from '@worker-tools/json-fetch';

const response = await fetch(new JSONRequest('/some', { 
  method: 'POST', 
  body: json,

You can also use the updated jsonFetch function:

import { jsonFetch as fetch } from '@worker-tools/json-fetch';

const response = await fetch('/some', { method: 'POST', body: data })

Note that previous use cases remain intact, i.e. posting FormData, ReadableStream, etc. as body works:

const response = await fetch(new JSONRequest('/some', { 
  method: 'POST', 
  body: new FromData(form),

This will send the body as form-data/multipart with correct content type header, as in the original Fetch API. Only difference is that the Accept header will be set to indicate preference for application/json, i.e. anticipating a JSON response from the server.

This module is part of the Worker Tools collection

Worker Tools are a collection of TypeScript libraries for writing web servers in Worker Runtimes such as Cloudflare Workers, Deno Deploy and Service Workers in the browser.

If you liked this module, you might also like:

  • 🧭 Worker Router --- Complete routing solution that works across CF Workers, Deno and Service Workers
  • 🔋 Worker Middleware --- A suite of standalone HTTP server-side middleware with TypeScript support
  • 📄 Worker HTML --- HTML templating and streaming response library
  • 📦 Storage Area --- Key-value store abstraction across Cloudflare KV, Deno and browsers.
  • 🆗 Response Creators --- Factory functions for responses with pre-filled status and status text
  • 🎏 Stream Response --- Use async generators to build streaming responses for SSE, etc...
  • 🥏 JSON Fetch --- Drop-in replacements for Fetch API classes with first class support for JSON.
  • 🦑 JSON Stream --- Streaming JSON parser/stingifier with first class support for web streams.

Worker Tools also includes a number of polyfills that help bridge the gap between Worker Runtimes:

Fore more visit workers.tools.

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npm i @worker-tools/json-fetch

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