Calculates total costs of your chatgpt chats if you were using API (text only, no muiltimedia consideration)

cost.js

const fs = require('fs');

// ToDo: Update these values if needed
const CONVERSATIONS_FILE_PATH = './conversations.json'; // From your chatGPT data export
const CHARACTERS_PER_TOKEN = 4;
const PRICING_DOLLARS_PER_MILLION_TOKENS = {
  input: 2.50,
  output: 10
};

let jsonData = JSON.parse(fs.readFileSync(CONVERSATIONS_FILE_PATH, 'utf-8'));

function processMessages(conversation) {
    let messages = [];
    
    let currentNode = conversation.current_node;
    while (currentNode != null) {
        let node = conversation.mapping[currentNode];
        if (
            node.message &&
            node.message.content &&
            node.message.content.parts &&
            node.message.content.parts.length > 0 &&
            (node.message.author.role !== "system"  || node.message.metadata.is_user_system_message)
        ) {
            if (node.message.content.content_type == "text" || node.message.content.content_type == "multimodal_text") {
              for (let i = 0; i < node.message.content.parts.length; i++) {
                let part = node.message.content.parts[i];
                if (typeof part === "string" && part.length > 0) {
                  if (node.message.author.role === "assistant" || node.message.author.role === "tool") {
                      outputCharacters += part.length;
                  } else {
                      inputCharacters += part.length;
                  }
                }
              }
            }
        }
        currentNode = node.parent;
    }
}

let inputCharacters = 0;
let outputCharacters = 0;

for (let i = 0; i < jsonData.length; i++) {
    let conversation = jsonData[i];
    processMessages(conversation);
}

const inputTokens = inputCharacters/CHARACTERS_PER_TOKEN;
const outputTokens = outputCharacters/CHARACTERS_PER_TOKEN;

console.log(`\nExtracted character counts`);
console.log({inputCharacters, outputCharacters});

console.log(`\nTokens (using given factor of ${CHARACTERS_PER_TOKEN} characters per token)`);
console.log({inputTokens, outputTokens});

console.log(`\nTotal cost (using given input/output token pricing (dollars) of per million token units ${PRICING_DOLLARS_PER_MILLION_TOKENS.input}, ${PRICING_DOLLARS_PER_MILLION_TOKENS.output})`);
console.log((inputTokens * PRICING_DOLLARS_PER_MILLION_TOKENS.input / 1e6) + (outputTokens * PRICING_DOLLARS_PER_MILLION_TOKENS.output / 1e6));