What is the Geocoding API? Converting between addresses and latitude/longitude

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Based on official Google primary sources, this guide outlines the role of the Geocoding API in bidirectional address and coordinate conversion, differences from the Places API, and safe testing procedures.

Information verification date: 2026-09-19

In short

The Geocoding API isan API that links text-based address information with geographic coordinates (latitude and longitude).

AspectContent
CategoryGoogle Maps Platform / Places
Primary ObjectiveBidirectional conversion between addresses and coordinates
Main OperationsGeocoding / Reverse Geocoding
Concurrent UseMaps, Places, Routes, Address Validation
Primary UsersDevelopers of mapping, delivery, and address management applications
flowchart LR
 Address[住所] --> Geo[Geocoding API]
 Geo --> Coord[緯度・経度]
 Coord --> Reverse[Reverse Geocoding]
 Reverse --> Address2[住所候補]

What can it do?

It focuses primarily on standard geocoding, which derives coordinates from addresses, and reverse geocoding, which derives address candidates from coordinates. Its purpose differs from the Places API, which searches for places themselves, and the Address Validation API, which checks address quality.

Practical Examples

General Users and Administrative Staffuse it from the consumer side, such as for workflows displaying address lists on maps,IT Administratorsmanage projects, billing, API key restrictions, and personal data, whileDevelopersintegrate it into processes for displaying maps after address registration or showing locations from coordinates.

A Bridge for Microsoft-Experienced Users

The conceptual framework is similar to Azure Maps geocoding features, but the responses, identifiers, pricing, and terms of use are not identical. It is easier to organize by understanding it as "Google Maps-side address-to-coordinate conversion."

APIs, Authentication, Pricing, and Security

As a Google Maps Platform API, verify the Google Cloud project, billing, API enablement, and authentication settings. Because pricing and quotas are subject to change, always check the official documentation. Do not store live API keys, customer addresses, or location history in public GitHub repositories.

Safely Testing

Set the success condition as receiving coordinates for a single address that does not contain personal information, such as a public facility. Next, change only one location factor, such as the city or ward, and verify the difference in the results.

Official Google Information

Deep dive into individual primary sources

The Geocoding API provides geocoding, which converts addresses into latitude and longitude coordinates, and reverse geocoding, which does the opposite. Since Places services may be suitable for search suggestions as users type, use each according to its intended purpose.

Official Google primary sources

Papanda TRY: Address to Coordinates to Map Card

According to official Google documentation, the Geocoding API handles conversion from addresses to latitude/longitude coordinates or Place IDs, as well as reverse geocoding from coordinates to addresses. Daily Code does not use actual API keys; instead, it uses fixture JSON for public locations such as Tokyo Station to display "address to lat/lng to map link data" as a browser card. To proceed to the live API version, verify key restrictions and billing.

What kind of service is this ultimately?

It is a Google Maps Platform API that converts addresses into map-compatible coordinates, and coordinates into human-readable address candidates.The next step is to first test conversion with a single location that does not contain personal information, and then verify the functional differences compared to Places.

Document information

Article title
What is the Geocoding API? Converting between addresses and latitude/longitude
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https://papanda925.com/?p=17765&lang=en

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