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The client provides a convenient way to interact with the model API.
npm install --save @fal-ai/clientSet FAL_KEY as an environment variable in your runtime.
export FAL_KEY="YOUR_API_KEY"The client API handles the API submit protocol. It will handle the request status updates and return the result when the request is completed.
import { fal } from "@fal-ai/client";
const result = await fal.subscribe("fal-ai/qwen-image-2.1", {
input: {
prompt: "A capybara reading a book by candlelight, oil painting"
},
logs: true,
onQueueUpdate: (update) => {
if (update.status === "IN_PROGRESS") {
update.logs.map((log) => log.message).forEach(console.log);
}
},
});
console.log(result.data);
console.log(result.requestId);The API uses an API Key for authentication. It is recommended you set the FAL_KEY environment variable in your runtime when possible.
import { fal } from "@fal-ai/client";
fal.config({
credentials: "YOUR_FAL_KEY"
});The client API provides a convenient way to submit requests to the model.
import { fal } from "@fal-ai/client";
const { request_id } = await fal.queue.submit("fal-ai/qwen-image-2.1", {
input: {
prompt: "A capybara reading a book by candlelight, oil painting"
},
webhookUrl: "https://optional.webhook.url/for/results",
});You can fetch the status of a request to check if it is completed or still in progress.
import { fal } from "@fal-ai/client";
const status = await fal.queue.status("fal-ai/qwen-image-2.1", {
requestId: "764cabcf-b745-4b3e-ae38-1200304cf45b",
logs: true,
});Once the request is completed, you can fetch the result. See the Output Schema for the expected result format.
import { fal } from "@fal-ai/client";
const result = await fal.queue.result("fal-ai/qwen-image-2.1", {
requestId: "764cabcf-b745-4b3e-ae38-1200304cf45b"
});
console.log(result.data);
console.log(result.requestId);Some attributes in the API accept file URLs as input. Whenever that's the case you can pass your own URL or a Base64 data URI.
You can pass a Base64 data URI as a file input. The API will handle the file decoding for you. Keep in mind that for large files, this alternative although convenient can impact the request performance.
You can also pass your own URLs as long as they are publicly accessible. Be aware that some hosts might block cross-site requests, rate-limit, or consider the request as a bot.
We provide a convenient file storage that allows you to upload files and use them in your requests. You can upload files using the client API and use the returned URL in your requests.
import { fal } from "@fal-ai/client";
const file = new File(["Hello, World!"], "hello.txt", { type: "text/plain" });
const url = await fal.storage.upload(file);Read more about file handling in our file upload guide.
prompt string* requiredThe prompt describing the image to generate.
prompt_expander PromptExpanderEnumPrompt expansion mode. Quality enhances the prompt; none uses it unchanged. Default value: "quality"
Possible enum values: none, quality
Output size, rounded to multiples of 32 pixels. Default value: square_hd
Possible enum values: square_hd, square, portrait_4_3, portrait_16_9, landscape_4_3, landscape_16_9
Note: For custom image sizes, you can pass the width and height as an object:
"image_size": {
"width": 1280,
"height": 720
}guidance_scale floatClassifier-free guidance strength. The model defaults to no guidance. Default value: 1
negative_prompt stringContent to avoid; used only when guidance_scale is greater than 1. Default value: ""
seed integerSeed for reproducibility.
num_images integerNumber of images to generate sequentially. Default value: 1
enable_safety_checker booleanWhether to check generated images for unsafe content. Default value: true
output_format OutputFormatEnumOutput format. PNG and WebP preserve transparency; JPEG uses white. Default value: "png"
Possible enum values: png, jpeg, webp
sync_mode booleanReturn images as data URIs instead of CDN URLs.
{
"prompt": "A capybara reading a book by candlelight, oil painting",
"prompt_expander": "quality",
"image_size": "square_hd",
"guidance_scale": 1,
"num_images": 1,
"enable_safety_checker": true,
"output_format": "png"
}The generated image files info.
seed integer* requiredSeed of the generated Image. It will be the same value of the one passed in the input or the randomly generated that was used in case none was passed.
Whether the generated images contain NSFW concepts.
prompt string* requiredThe prompt used for generating the image.
{
"images": [
{
"url": "",
"content_type": "image/jpeg"
}
],
"prompt": ""
}width integerThe width of the generated image. Default value: 512
height integerThe height of the generated image. Default value: 512
url string* requiredwidth integer* requiredheight integer* requiredcontent_type stringDefault value: "image/jpeg"