Function default

Sets the default method (text, json, …) used to parse the data contained in the response body in case of an HTTP error. As with other static methods, it will affect wretch instances created after calling this function.

Note: if the response Content-Type header is set to "application/json", the body will be parsed as json regardless of the errorType.

import wretch from "wretch"

wretch.errorType("json")

wretch("http://server/which/returns/an/error/with/a/json/body")
  .get()
  .res()
  .catch(error => {
    // error[errorType] (here, json) contains the parsed body
    console.log(error.json)
  })
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If null, defaults to "text".

Sets the default fetch options that will be stored internally when instantiating wretch objects.

import wretch from "wretch"

wretch.options({ headers: { "Accept": "application/json" } });

// The fetch request is sent with both headers.
wretch("...", { headers: { "X-Custom": "Header" } }).get().res();
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Sets the default polyfills that will be stored internally when instantiating wretch objects. Useful for browserless environments like node.js.

Needed for libraries like fetch-ponyfill.

import wretch from "wretch"

wretch.polyfills({
  fetch: require("node-fetch"),
  FormData: require("form-data"),
  URLSearchParams: require("url").URLSearchParams,
});

// Uses the above polyfills.
wretch("...").get().res();
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