Gmail API

Business / OAuth Advanced HTTPS
Varies by plan (check documentation)

Overview

The Gmail API gives you full read/write access to a Gmail inbox via OAuth 2.0 — send messages, read threads, manage labels, and search mail. Ideal for email automation and CRM integrations.

Beginner Tip

Message bodies are base64url-encoded inside the payload field — use Buffer.from(data, "base64url").toString() in Node.js to decode them. Forgetting this is the most common stumbling block.

Available Data

email delivery status
message ID
bounce/complaint data
open/click tracking

Example Response

JSON Response
{
  "message_id": "msg_abc123def456",
  "status": "delivered",
  "to": "user@example.com",
  "subject": "Welcome!",
  "timestamp": "2025-01-15T10:30:00Z"
}

Field Reference

messages List of message objects; each contains only id and threadId — fetch individual messages for full content.
messages[].id The immutable ID that uniquely identifies this email message.
messages[].threadId ID of the conversation thread this message belongs to.
nextPageToken Token to pass as pageToken in the next request to retrieve the following page of results.
resultSizeEstimate Approximate total number of messages matching the query.

Implementation Example

Request
// ⚠️ Note: This URL may be a documentation page. Check official docs for actual API endpoint.
const url = "https://developers.google.com/gmail/api/";
// 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

403 insufficientPermissions The OAuth access token was granted without the required Gmail scope
Re-authorize the user with the correct scope such as https://www.googleapis.com/auth/gmail.readonly for reading or .modify for send and delete.
Garbled message body text Raw message bytes were not decoded from base64url before displaying
Use a library like googleapis for Node.js or google-api-python-client for Python — they handle encoding and decoding automatically.
429 rateLimitExceeded Exceeded the per-user quota of 250 quota units per second
Batch requests using the batch endpoint and implement exponential backoff when you receive 429 or 500 responses.

Metadata Score Breakdown

Estimated from metadata — endpoint not independently tested

This score is estimated from observable metadata — HTTPS support, authentication model, declared CORS, and documentation reachability — because the API requires authentication or exposes no publicly testable endpoint. The five-signal breakdown is only shown for live-tested APIs.

Metadata estimate · endpoint not independently tested

Technical Specifications

Auth OAuth
HTTPS REQUIRED
CORS UNKNOWN
Category Business
Difficulty Advanced
Verified: 2026-04-07

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