Ensure you are running webui with the API enabled (--api in your webui-user.bat)

Ensure you are running webui with the API enabled (--api in your webui-user.bat)
Saves files to a folder called output in the working directory
You can specify a filename per entry (see example 'hello') or uses {time} {prompt} {seed} formatting if not specified

Script, save as file2prompt.mjs or something

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import fs from "fs"; // for loading the config file, creating output dir, saving file
import http from "http"; // for calling the webui api

// If you dont run on the standard port
const WEBUI_PORT = 7860;

// Make HTTP POST request to webui API
function post({ body, ...options }) {
    return new Promise((resolve, reject) => {
        const req = http.request(
            {
                method: "POST",
                ...options,
            },
            (res) => {
                const chunks = [];
                res.on("data", (data) => chunks.push(data));
                res.on("end", () => {
                    let resBody = Buffer.concat(chunks);
                    switch (res.headers["content-type"]) {
                        case "application/json":
                            resBody = JSON.parse(resBody);
                            break;
                    }
                    resolve(resBody);
                });
            }
        );
        req.on("error", reject);
        if (body) {
            req.write(body);
        }
        req.end();
    });
}

// Ensure we have a config
if (!fs.existsSync("./config.json")) {
    throw new Error("config.json missing");
}

// Load the config
const config = JSON.parse(fs.readFileSync("./config.json"));
console.log(config.length, "images to generate");

// Ensure output directory exists
if (!fs.existsSync("./output")) {
    fs.mkdirSync("./output");
}

// Process each config entry
for (let i = 0; i < config.length; i++) {
    const c = config[i];

    console.log(`${i + 1}/${config.length} - ${c.prompt}`);

    let filename = c.filename;
    delete c.filename;

    // Make the request to t he txt2img API
    const res = await post({
        hostname: "127.0.0.1",
        port: WEBUI_PORT,
        path: "/sdapi/v1/txt2img",
        body: JSON.stringify(c),
        headers: {
            "content-type": "application/json",
        },
    });

    // Parse response
    const info = JSON.parse(res.info);
    if (!info || !info.job_timestamp) {
        console.log(res);
        throw new Error("Unexpected response from API");
    }

   // Ensure we have a filename
    if (!filename) {
        filename = `${info.job_timestamp} ${info.prompt.substr(0, 50)} (${info.seed}).png`;
    } else if (!filename.endsWith(".png")) {
        filename += ".png";
    }

   // Save
    fs.writeFileSync("./output/" + filename, res.images[0], "base64");
}

console.log("Done");

Create config.json next to the mjs file, example:

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[
   {
      "filename": "hello",
      "prompt": "1girl solo chibi",
      "negative_prompt": "big ears",
      "enable_hr": false,
      "denoising_strength": 0,
      "firstphase_width": 0,
      "firstphase_height": 0,
      "seed": -1,
      "steps": 10,
      "cfg_scale": 7,
      "width": 512,
      "height": 512,
      "sampler_index": "DPM++ 2M Karras"
   },
   {
      "prompt": "1girl solo",
      "negative_prompt": "something",
      "enable_hr": true,
      "denoising_strength": 0.7,
      "firstphase_width": 0,
      "firstphase_height": 0,
      "seed": -1,
      "steps": 10,
      "cfg_scale": 7,
      "width": 1024,
      "height": 768,
      "sampler_index": "DPM++ 2M Karras"
   }
]

Run with node file2prompt.mjs

API txt2img schema:

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{
  "enable_hr": false,
  "denoising_strength": 0,
  "firstphase_width": 0,
  "firstphase_height": 0,
  "prompt": "",
  "styles": [
    "string"
  ],
  "seed": -1,
  "subseed": -1,
  "subseed_strength": 0,
  "seed_resize_from_h": -1,
  "seed_resize_from_w": -1,
  "batch_size": 1,
  "n_iter": 1,
  "steps": 50,
  "cfg_scale": 7,
  "width": 512,
  "height": 512,
  "restore_faces": false,
  "tiling": false,
  "negative_prompt": "string",
  "eta": 0,
  "s_churn": 0,
  "s_tmax": 0,
  "s_tmin": 0,
  "s_noise": 1,
  "override_settings": {},
  "sampler_index": "Euler"
}