OpenAI Node.js SDK

import OpenAI from 'openai'; export const promptix = new OpenAI({  baseURL: 'https://promptix.tn/api/v1', // the only line that changes  apiKey: process.env.PROMPTIX_API_KEY,});

export OPENAI_BASE_URL="https://promptix.tn/api/v1"export OPENAI_API_KEY="$PROMPTIX_API_KEY" # Existing code that calls new OpenAI() with no options now goes through Promptix

import { promptix } from './client.js'; const completion = await promptix.chat.completions.create({  model: 'anthropic/claude-sonnet-4',  messages: [    { role: 'system', content: 'You are a helpful assistant who answers in French.' },    { role: 'user', content: 'Explain what a VAT number is in two sentences.' },  ],  temperature: 0.3,  max_tokens: 300,}); console.log(completion.choices[0].message.content);console.log(completion.usage?.total_tokens, 'tokens');

const stream = await promptix.chat.completions.create({  model: 'openai/gpt-4o-mini',  messages: [{ role: 'user', content: 'List five dishes from Tunisian cuisine.' }],  stream: true,}); for await (const chunk of stream) {  process.stdout.write(chunk.choices[0]?.delta?.content ?? '');}

// app/api/chat/route.ts: stream the answer to the browser as plain textimport OpenAI from 'openai'; const promptix = new OpenAI({  baseURL: 'https://promptix.tn/api/v1',  apiKey: process.env.PROMPTIX_API_KEY,}); export async function POST(req: Request) {  const { prompt } = await req.json();   const stream = await promptix.chat.completions.create({    model: 'openai/gpt-4o-mini',    messages: [{ role: 'user', content: String(prompt) }],    max_tokens: 800,    stream: true,  });   const encoder = new TextEncoder();  const body = new ReadableStream({    async start(controller) {      try {        for await (const chunk of stream) {          const text = chunk.choices[0]?.delta?.content;          if (text) controller.enqueue(encoder.encode(text));        }        controller.close();      } catch (err) {        controller.error(err);      }    },  });   return new Response(body, { headers: { 'Content-Type': 'text/plain; charset=utf-8' } });}

const tools = [  {    type: 'function',    function: {      name: 'get_order_status',      description: 'Look up an order by its number',      parameters: {        type: 'object',        properties: { orderId: { type: 'string' } },        required: ['orderId'],      },    },  },]; const messages = [{ role: 'user', content: 'Where is my order 10452?' }];const first = await promptix.chat.completions.create({ model: 'openai/gpt-4o-mini', messages, tools });const call = first.choices[0].message.tool_calls?.[0]; if (call) {  const args = JSON.parse(call.function.arguments);  const result = { orderId: args.orderId, status: 'shipped', eta: '2 days' }; // your own lookup   const second = await promptix.chat.completions.create({    model: 'openai/gpt-4o-mini',    tools,    messages: [      ...messages,      first.choices[0].message,      { role: 'tool', tool_call_id: call.id, content: JSON.stringify(result) },    ],  });  console.log(second.choices[0].message.content);}

import OpenAI from 'openai'; try {  await promptix.chat.completions.create({    model: 'openai/gpt-4o-mini',    messages: [{ role: 'user', content: 'Hello' }],  });} catch (err) {  if (err instanceof OpenAI.APIError) {    // err.status: 401, 402, 429...; err.code: 'key_monthly_limit' for the per-key limit    console.error(err.status, err.code, err.message);  }  throw err;}