Coingecko Typescript API Library

Coingecko Typescript API Library

What is Coingecko Typescript API Library about?

A lightweight client that wraps the public CoinGecko API, exposing every endpoint with TypeScript types. It handles HTTP details, retries, timeout management, and surface errors as subclasses of APIError so developers can focus on business logic.

How to use Coingecko Typescript API Library?

1. Install the package (see serverConfig).
2. Import and instantiate the client, providing a Pro or Demo API key if needed.

import Coingecko from '@coingecko/coingecko-typescript';

const client = new Coingecko({
  proAPIKey: process.env['COINGECKO_PRO_API_KEY'],
  environment: 'pro' // or 'demo'
});

// Simple price request
const price = await client.simple.price.get({ vs_currencies: 'usd', ids: 'bitcoin' });
console.log(price);

3. Use the generated request/response types for compile‑time safety.
4. Optional: configure retries, timeouts, logging, or custom fetch implementation via client options.

Key features of Coingecko Typescript API Library

• Full type coverage for all request parameters and response fields.
• Automatic retries (default 2) with exponential back‑off for network failures, rate limits, and server errors.
• Configurable timeouts (default 60 s) and per‑request overrides.
• Rich error hierarchy (BadRequestError, AuthenticationError, RateLimitError, etc.).
• Raw response access via .asResponse() and .withResponse() for header inspection or streaming.
• Flexible logging with configurable log levels and support for custom logger instances.
• Undocumented endpoint support through generic client.get, client.post, etc.
• Custom fetch integration for environments like Node, Bun, Deno, Cloudflare Workers.

Use cases of Coingecko Typescript API Library

• Building price tickers, dashboards, or portfolio trackers for cryptocurrencies.
• Aggregating market data for analytics, research, or trading bots.
• Server‑side rendering of crypto statistics in web applications.
• Integrating CoinGecko data into financial SaaS platforms or DeFi dashboards.
• Prototyping market‑aware features in full‑stack TypeScript projects.

FAQ from the Coingecko Typescript API Library

Q: Do I need an API key? A: The library works with the public free tier, but for higher rate limits you can supply a Pro or Demo API key via proAPIKey or demoAPIKey.

Q: How are retries configured? A: Global default via maxRetries in the client constructor, or per‑request via the options argument.

Q: Can I change the request timeout? A: Yes, set timeout (in milliseconds) globally or per request.

Q: How do I access response headers? A: Use .asResponse() to get the raw Response object before the body is consumed, or .withResponse() to get both the parsed data and the raw response.

Q: Which runtimes are supported? A: Modern browsers, Node.js 20+, Deno 1.28+, Bun 1.0+, Cloudflare Workers, Vercel Edge Runtime, and Jest.

Q: Is React Native supported? A: Currently no; open an issue if you need support.

Q: How do I enable detailed debugging logs? A: Set logLevel: 'debug' in the client options or use the COINGECKO_LOG environment variable.

Coingecko TypeScript API Library

This library provides convenient access to the Coingecko REST API from server-side TypeScript or JavaScript.

The REST API documentation can be found on docs.coingecko.com. The full API of this library can be found in api.md.

It is generated with Stainless.

Installation

npm install @coingecko/coingecko-typescript

Usage

The full API of this library can be found in api.md.

import Coingecko from '@coingecko/coingecko-typescript';

const client = new Coingecko({
  proAPIKey: process.env['COINGECKO_PRO_API_KEY'],
  // demoAPIKey: process.env['COINGECKO_DEMO_API_KEY'], // Optional, for Demo API access
  environment: 'pro', // 'demo' to initialize the client with Demo API access
});

async function main() {
  const price = await client.simple.price.get({ vs_currencies: 'usd', ids: 'bitcoin' });
  console.log(price);
}

main()

Request & Response types

This library includes TypeScript definitions for all request params and response fields. You may import and use them like so:

import Coingecko from '@coingecko/coingecko-typescript';

const client = new Coingecko({
  proAPIKey: process.env['COINGECKO_PRO_API_KEY'],
  // demoAPIKey: process.env['COINGECKO_DEMO_API_KEY'], // Optional, for Demo API access
  environment: 'pro', // 'demo' to initialize the client with Demo API access
});

const params: Coingecko.Simple.PriceGetParams = { vs_currencies: 'usd', ids: 'bitcoin' };
const price: Coingecko.Simple.PriceGetResponse = await client.simple.price.get(params);

Documentation for each method, request param, and response field are available in docstrings and will appear on hover in most modern editors.

Handling errors

When the library is unable to connect to the API, or if the API returns a non-success status code (i.e., 4xx or 5xx response), a subclass of APIError will be thrown:

const price = await client.simple.price.get({ vs_currencies: 'usd', ids: 'bitcoin' }).catch(async (err) => {
  if (err instanceof Coingecko.APIError) {
    console.log(err.status); // 400
    console.log(err.name); // BadRequestError
    console.log(err.headers); // {server: 'nginx', ...}
  } else {
    throw err;
  }
});

Error codes are as follows:

Status Code	Error Type
400	BadRequestError
401	AuthenticationError
403	PermissionDeniedError
404	NotFoundError
422	UnprocessableEntityError
429	RateLimitError
>=500	InternalServerError
N/A	APIConnectionError

Retries

Certain errors will be automatically retried 2 times by default, with a short exponential backoff. Connection errors (for example, due to a network connectivity problem), 408 Request Timeout, 409 Conflict, 429 Rate Limit, and >=500 Internal errors will all be retried by default.

You can use the maxRetries option to configure or disable this:

// Configure the default for all requests:
const client = new Coingecko({
  maxRetries: 0, // default is 2
});

// Or, configure per-request:
await client.simple.price.get({ vs_currencies: 'usd', ids: 'bitcoin' }, {
  maxRetries: 5,
});

Timeouts

Requests time out after 1 minute by default. You can configure this with a timeout option:

// Configure the default for all requests:
const client = new Coingecko({
  timeout: 20 * 1000, // 20 seconds (default is 1 minute)
});

// Override per-request:
await client.simple.price.get({ vs_currencies: 'usd', ids: 'bitcoin' }, {
  timeout: 5 * 1000,
});

On timeout, an APIConnectionTimeoutError is thrown.

Note that requests which time out will be retried twice by default.

Advanced Usage

Accessing raw Response data (e.g., headers)

The "raw" Response returned by fetch() can be accessed through the .asResponse() method on the APIPromise type that all methods return. This method returns as soon as the headers for a successful response are received and does not consume the response body, so you are free to write custom parsing or streaming logic.

You can also use the .withResponse() method to get the raw Response along with the parsed data. Unlike .asResponse() this method consumes the body, returning once it is parsed.

const client = new Coingecko();

const response = await client.simple.price.get({ vs_currencies: 'usd', ids: 'bitcoin' }).asResponse();
console.log(response.headers.get('X-My-Header'));
console.log(response.statusText); // access the underlying Response object

const { data: price, response: raw } = await client.simple.price
  .get({ vs_currencies: 'usd', ids: 'bitcoin' })
  .withResponse();
console.log(raw.headers.get('X-My-Header'));
console.log(price);

Logging

[!IMPORTANT] All log messages are intended for debugging only. The format and content of log messages may change between releases.

Log levels

The log level can be configured in two ways:

1. Via the COINGECKO_LOG environment variable
2. Using the logLevel client option (overrides the environment variable if set)

import Coingecko from '@coingecko/coingecko-typescript';

const client = new Coingecko({
  logLevel: 'debug', // Show all log messages
});

Available log levels, from most to least verbose:

• 'debug' - Show debug messages, info, warnings, and errors
• 'info' - Show info messages, warnings, and errors
• 'warn' - Show warnings and errors (default)
• 'error' - Show only errors
• 'off' - Disable all logging

At the 'debug' level, all HTTP requests and responses are logged, including headers and bodies. Some authentication-related headers are redacted, but sensitive data in request and response bodies may still be visible.

Custom logger

By default, this library logs to globalThis.console. You can also provide a custom logger. Most logging libraries are supported, including pino, winston, bunyan, consola, signale, and @std/log. If your logger doesn't work, please open an issue.

When providing a custom logger, the logLevel option still controls which messages are emitted, messages below the configured level will not be sent to your logger.

import Coingecko from '@coingecko/coingecko-typescript';
import pino from 'pino';

const logger = pino();

const client = new Coingecko({
  logger: logger.child({ name: 'Coingecko' }),
  logLevel: 'debug', // Send all messages to pino, allowing it to filter
});

Making custom/undocumented requests

This library is typed for convenient access to the documented API. If you need to access undocumented endpoints, params, or response properties, the library can still be used.

Undocumented endpoints

To make requests to undocumented endpoints, you can use client.get, client.post, and other HTTP verbs. Options on the client, such as retries, will be respected when making these requests.

await client.post('/some/path', {
  body: { some_prop: 'foo' },
  query: { some_query_arg: 'bar' },
});

Undocumented request params

To make requests using undocumented parameters, you may use // @ts-expect-error on the undocumented parameter. This library doesn't validate at runtime that the request matches the type, so any extra values you send will be sent as-is.

client.simple.price.get({
  // ...
  // @ts-expect-error baz is not yet public
  baz: 'undocumented option',
});

For requests with the GET verb, any extra params will be in the query, all other requests will send the extra param in the body.

If you want to explicitly send an extra argument, you can do so with the query, body, and headers request options.

Undocumented response properties

To access undocumented response properties, you may access the response object with // @ts-expect-error on the response object, or cast the response object to the requisite type. Like the request params, we do not validate or strip extra properties from the response from the API.

Customizing the fetch client

By default, this library expects a global fetch function is defined.

If you want to use a different fetch function, you can either polyfill the global:

import fetch from 'my-fetch';

globalThis.fetch = fetch;

Or pass it to the client:

import Coingecko from '@coingecko/coingecko-typescript';
import fetch from 'my-fetch';

const client = new Coingecko({ fetch });

Fetch options

If you want to set custom fetch options without overriding the fetch function, you can provide a fetchOptions object when instantiating the client or making a request. (Request-specific options override client options.)

import Coingecko from '@coingecko/coingecko-typescript';

const client = new Coingecko({
  fetchOptions: {
    // `RequestInit` options
  },
});

Configuring proxies

To modify proxy behavior, you can provide custom fetchOptions that add runtime-specific proxy options to requests:

Node [docs]

import Coingecko from '@coingecko/coingecko-typescript';
import * as undici from 'undici';

const proxyAgent = new undici.ProxyAgent('http://localhost:8888');
const client = new Coingecko({
  fetchOptions: {
    dispatcher: proxyAgent,
  },
});

Bun [docs]

import Coingecko from '@coingecko/coingecko-typescript';

const client = new Coingecko({
  fetchOptions: {
    proxy: 'http://localhost:8888',
  },
});

Deno [docs]

import Coingecko from 'npm:@coingecko/coingecko-typescript';

const httpClient = Deno.createHttpClient({ proxy: { url: 'http://localhost:8888' } });
const client = new Coingecko({
  fetchOptions: {
    client: httpClient,
  },
});

Frequently Asked Questions

Semantic versioning

This package generally follows SemVer conventions, though certain backwards-incompatible changes may be released as minor versions:

1. Changes that only affect static types, without breaking runtime behavior.
2. Changes to library internals which are technically public but not intended or documented for external use. (Please open a GitHub issue to let us know if you are relying on such internals.)
3. Changes that we do not expect to impact the vast majority of users in practice.

We take backwards-compatibility seriously and work hard to ensure you can rely on a smooth upgrade experience.

We are keen for your feedback; please open an issue with questions, bugs, or suggestions.

Requirements

TypeScript >= 4.9 is supported.

The following runtimes are supported:

• Web browsers (Up-to-date Chrome, Firefox, Safari, Edge, and more)
• Node.js 20 LTS or later (non-EOL) versions.
• Deno v1.28.0 or higher.
• Bun 1.0 or later.
• Cloudflare Workers.
• Vercel Edge Runtime.
• Jest 28 or greater with the "node" environment ("jsdom" is not supported at this time).
• Nitro v2.6 or greater.

Note that React Native is not supported at this time.

If you are interested in other runtime environments, please open or upvote an issue on GitHub.

Contributing

See the contributing documentation.