\n```\n\nOptions:\n\n| Option | Signature | Description |\n| -------------------------------- | ------------------------------ | ----------------------------------------------------------------------------------------------------------------------------- |\n| `baseUrl` | `string` | Base URL for the request. |\n| `onError` | `(error, request) => void` | Executes on error. |\n| `onSuccess` | `(data, request) => void` | Executes when the request successfully completes. |\n| `onRequest` | `(request) => void` | Executes before the request is made. |\n| `onRequestStreaming` | `(event, request) => void` | Executes each time a request chunk is send. |\n| `onResponseStreaming` | `(event, response) => void` | Executes each time a response chunk is received. |\n| `onResponse` | `(response, request) => void` | Executes when a response is received, once all retries are completed. |\n| `onRetry` | `(ctx) => void` | Executes before each retry. |\n| `params` | `object` | The query parameters. |\n| `parseResponse` | `(response, request) => data` | The success response parser. |\n| `parseRejected` | `(response, request) => error` | The error response parser. |\n| `reject` | `(response) => boolean` | Decide when to reject the response. |\n| `retry` | `RetryOptions` | The retry options. |\n| `schema` | `StandardSchemaV1` | The schema to validate the response against.
The schema must follow the [Standard Schema Specification][standard-schema]. |\n| `serializeBody` | `(body) => BodyInit` | The body serializer.
Restrict the valid `body` type by typing its first argument. |\n| `serializeParams` | `(params) => string` | The query parameter serializer. |\n| `timeout` | `number` | The timeout in milliseconds. |\n| _...and all other fetch options_ | | |\n\n
\n\n### RetryOptions\n\n| Option | Signature | Description |\n| ---------- | -------------------- | -------------------------------------------------------------------------------------------- |\n| `when` | `(ctx) => boolean` | Function that determines if a retry should happen based on the response or error |\n| `attempts` | `number \\| function` | Number of retry attempts or function to determine attempts based on request. |\n| `delay` | `number \\| function` | Delay between retries in milliseconds or function to determine delay based on attempt number |\n\n
\n\n### isResponseError(error)\n\nChecks if the error is a `ResponseError`.\n\n### isResponseValidationError(error)\n\nChecks if the error is a `ResponseValidationError`.\n\n### isJsonifiable(value)\n\nDetermines whether a value can be safely converted to `json`.\n\nAre considered jsonifiable:\n\n- plain objects\n- arrays\n- class instances with a `toJSON` method\n\n## ➡️ Feature Comparison\n\nCheck out the [Feature Comparison][comparison] table to see how _upfetch_ compares to other fetching libraries.\n\n
\n\n## ➡️ Environment Support\n\n- ✅ Browsers (Chrome, Firefox, Safari, Edge)\n- ✅ Node.js (18.0+)\n- ✅ Bun\n- ✅ Deno\n- ✅ Cloudflare Workers\n- ✅ Vercel Edge Runtime\n\n\n
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