NextSolver Node.js SDK

Official Node.js SDK for NextSolver — AI-Powered Captcha Solving API.

CapSolver-compatible drop-in replacement. Zero dependencies. Change your base URL and you're live.

Installation

npm install nextsolver

Quick Start

const NextSolver = require('nextsolver');

const solver = new NextSolver('YOUR_API_KEY');

// Solve AWS WAF (instant, ~50ms)
const result = await solver.solveWaf(
  ['base64_image_1', 'base64_image_2'],
  'umbrella'
);
console.log(result); // [false, true, false, true, false, false]

// Solve reCAPTCHA v2 (auto-polls until ready)
const token = await solver.solveRecaptchaV2(
  'https://example.com',
  '6Le-wvkSAAAAAPBMRTvw0Q4Muexq9bi0DJwx_mJ-'
);
console.log(token);

Supported Captcha Types

| Type | Task Name | Method | |------|-----------|--------| | AWS WAF | AwsWafClassification | solveWaf() | | Image/Text | ImageToTextTask | solveImage() | | Math | MathCaptcha | solve() | | Audio | AudioTask | solve() | | FriendlyCaptcha | FriendlyCaptchaTaskProxyless | solveFriendly() | | reCAPTCHA v2 | ReCaptchaV2TaskProxyless | solveRecaptchaV2() | | FunCaptcha | FunCaptchaTaskProxyless | solveFunCaptcha() | | FunCaptcha Classification | FunCaptchaClassification | solve() |

Advanced Usage

// Custom base URL
const solver = new NextSolver('YOUR_KEY', {
  baseUrl: 'https://your-server.com',
  timeout: 180000,
  pollInterval: 5000
});

// Low-level: create task + poll manually
const resp = await solver.createTask({ type: 'AwsWafClassification', images: [...], question: 'umbrella' });
const result = await solver.getTaskResult(resp.taskId);

// Check balance
const balance = await solver.getBalance();
console.log(`Credits: ${balance}`);

API Documentation

Full docs: https://nextsolver.com/docs-api

License

Copyright (c) 2024-2026 NextSolver. MIT License — see LICENSE.