M
API Matrix

YNAB API

Finance / OAuth Advanced HTTPS CORS
Varies by plan (check documentation)
68 Score
Grade C
Visit Official Site Compare Alternatives

Overview

The YNAB (You Need A Budget) API lets you programmatically read and write data from a user's YNAB budget, including accounts, transactions, and category balances. It uses OAuth 2.0, so users authorize your app without sharing their password. This is a great API for building personal finance dashboards or automating transaction imports.

💡

Beginner Tip

Start by getting a Personal Access Token from YNAB account settings under Developer Settings — it is much simpler than full OAuth for personal projects.

Available Data

Use case: Integrate budgeting & planning data into web and mobile applications
YNAB data via REST API
JSON-formatted response data
Requires OAuth authentication

Example Response

JSON Response 
{
  "status": "success",
  "data": {
    "result": "Data from YNAB",
    "description": "Budgeting & Planning",
    "timestamp": "2025-01-15T10:00:00Z"
  }
}

Field Reference

id Unique UUID for the budget.
name Human-readable budget name set by the user.
currency_format Currency symbol, decimal separator, and ISO code for this budget.
accounts List of linked accounts (checking, savings, credit cards, etc.).
last_modified_on ISO 8601 timestamp of the most recent change to this budget.

Implementation Example 

const url = "https://api.youneedabudget.com/";
// Replace headers or query params with the values required by this API.
const response = await fetch(url, {
  headers: {
  "Authorization": "Bearer YOUR_API_KEY"
  }
});
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data);

What Can You Build?

Note: These code examples are AI-generated and unverified. Always refer to the official API documentation for accurate usage.

Common Errors & Troubleshooting

401 Unauthorized The Bearer token is expired, missing, or has been revoked.
✓ Regenerate your Personal Access Token in YNAB Developer Settings and update it in your app.
400 Bad Request on transaction creation Date format is wrong — YNAB requires ISO 8601 format (YYYY-MM-DD).
✓ Ensure your date field is a string formatted like 2026-01-15 before sending.
budget_id last-used returns wrong budget If you have multiple budgets, last-used may point to an unexpected one.
✓ Call GET /budgets first to list all budget IDs, then use the explicit ID for your target budget.

Matrix Score Breakdown

🌐 Reachability 30/30
⚡ Speed 5/20
🔒 Security 15/15
🛠 Developer XP 8/20
✓ Reliability 10/15

Partially tested on Apr 5, 2026

Technical Specifications

Auth OAuth
HTTPS REQUIRED
CORS YES
Category Finance
Difficulty Advanced
Verified: 2026-04-07

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