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Example code of chimpmatic/mailchimp-api-key-validator

Informations about the package mailchimp-api-key-validator

Mailchimp API Key Validator

Latest Version PHP Version License

Validate Mailchimp API key format, detect common errors, and optionally verify connectivity — all without hitting the Mailchimp API until you're ready.

Author: Chimpmatic

Why This Exists

The most common support request for any Mailchimp integration is "Invalid API Key." The causes are always the same:

This library catches all of these before making an API call, giving your users clear error messages instead of a generic failure.

Need to get your Mailchimp API key first? See How to Get Your Mailchimp API Key for a one-click shortcut.

Installation

Quick Start

Connectivity Verification

Optionally verify the key works against the Mailchimp API (requires curl):

What It Catches

Issue Detection Message
Empty key Format check API key is empty.
Leading/trailing whitespace Format check Warning + auto-trim
Internal whitespace Format check Key contains whitespace characters.
Missing -us4 suffix Format check Missing datacenter suffix.
Wrong hash length Format check Key hash is N characters, expected 32.
Non-hex characters Format check Key hash contains non-hexadecimal characters.
Invalid datacenter format Format check Datacenter "X" does not match expected format.
Unknown datacenter Format check Warning (may be newer DC)
Revoked/disabled key Connectivity check API key is rejected by Mailchimp.
Insufficient permissions Connectivity check API key lacks sufficient permissions.

ValidationResult API

Requirements

Testing

Or run PHPUnit directly:

Links

License

MIT License. Copyright (c) 2026 Chimpmatic.

All versions of mailchimp-api-key-validator with dependencies

PHP Build Version
Package Version
Requires php Version >=7.4
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