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The client provides a convenient way to interact with the model API.
npm install --save @fal-ai/clientThe @fal-ai/serverless-client package has been deprecated in favor of @fal-ai/client. Install the new package and update your imports — see client setup.
Set 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/hy-wu-edit", {
input: {
prompt: "Using image 1 as the base image, replace the outfit with the clothing from image 2 while keeping the subject, pose, and background unchanged.",
image_urls: ["https://v3b.fal.media/files/b/0a933dff/BE-FgBximAbCJzZSgDNNw_input_1_1.png", "https://v3b.fal.media/files/b/0a933dff/fNUqzO_Lxwvr-_-4BLeCV_input_1_2.png"]
},
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"
});When running code on the client-side (e.g. in a browser, mobile app or GUI applications), make sure to not expose your FAL_KEY. Instead, use a server-side proxy to make requests to the API. For more information, check out our server-side integration guide.
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/hy-wu-edit", {
input: {
prompt: "Using image 1 as the base image, replace the outfit with the clothing from image 2 while keeping the subject, pose, and background unchanged.",
image_urls: ["https://v3b.fal.media/files/b/0a933dff/BE-FgBximAbCJzZSgDNNw_input_1_1.png", "https://v3b.fal.media/files/b/0a933dff/fNUqzO_Lxwvr-_-4BLeCV_input_1_2.png"]
},
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/hy-wu-edit", {
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/hy-wu-edit", {
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);The client will auto-upload the file for you if you pass a binary object (e.g. File, Data).
Read more about file handling in our file upload guide.
prompt string* requiredThe text prompt describing the desired edit. Supports both English and Chinese. Use specific instructions like 'Replace the clothing on figure 1 with the outfit from figure 2'.
URLs of input images for editing. Typically 2 images: the base image and the reference image. Supports up to 3 images.
The desired size of the generated image. If auto, image size will be determined by the model. Default value: auto
Possible enum values: auto, 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
}num_inference_steps integerNumber of diffusion denoising steps. Default value: 30
seed integerRandom seed for reproducible results. If None, a random seed is used.
num_images integerThe number of images to generate. Default value: 1
enable_thinking booleanEnable thinking mode. The model reasons about the edit before generating, producing higher quality results at the cost of longer inference time. Disable for faster results on straightforward edits. Default value: true
enable_safety_checker booleanIf set to true, the safety checker will be enabled. Default value: true
output_format OutputFormatEnumThe format of the generated image. Default value: "png"
Possible enum values: jpeg, png
sync_mode booleanIf True, the media will be returned as a data URI.
{
"prompt": "Using image 1 as the base image, replace the outfit with the clothing from image 2 while keeping the subject, pose, and background unchanged.",
"image_urls": [
"https://v3b.fal.media/files/b/0a933dff/BE-FgBximAbCJzZSgDNNw_input_1_1.png",
"https://v3b.fal.media/files/b/0a933dff/fNUqzO_Lxwvr-_-4BLeCV_input_1_2.png"
],
"image_size": "auto",
"num_inference_steps": 30,
"num_images": 1,
"enable_thinking": true,
"enable_safety_checker": true,
"output_format": "png"
}A list of the generated/edited images.
seed integer* requiredThe seed used for generation.
Performance timing breakdown.
{
"images": [
{
"url": "",
"content_type": "image/png",
"file_name": "z9RV14K95DvU.png",
"file_size": 4404019,
"width": 1024,
"height": 1024
}
],
"timings": {}
}url string* requiredThe URL where the file can be downloaded from.
content_type stringThe mime type of the file.
file_name stringThe name of the file. It will be auto-generated if not provided.
file_size integerThe size of the file in bytes.
width integerThe width of the image in pixels.
height integerThe height of the image in pixels.
width integerThe width of the generated image. Default value: 512
height integerThe height of the generated image. Default value: 512