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What is couchdb?

apache/couchdb — explained in plain English

Analysis updated 2026-06-24

★ 6,876ErlangAudience · developerComplexity · 4/5LicenseSetup · moderate

In one sentence

A database that stores and syncs JSON documents over HTTP, letting multiple copies stay in sync across servers or devices even when offline.

Mindmap

mindmap
  root((CouchDB))
    What it does
      Stores JSON docs
      HTTP API access
      Offline sync
      Conflict handling
    Tech Stack
      Erlang runtime
      Fauxton admin UI
      JSON format
    Use Cases
      Offline mobile apps
      Multi-region sync
      Schema-free storage
    Setup
      Unix or Windows
      VS Code container
      Configure and make
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filefunction / class

What do people build with it?

USE CASE 1

Build a mobile app that works offline and syncs data to a central server when reconnected.

USE CASE 2

Store and query user-submitted JSON records without a fixed data schema.

USE CASE 3

Set up a multi-region database where each region writes locally and syncs changes later.

USE CASE 4

Administer the database through a browser-based dashboard without writing any code.

What is it built with?

ErlangHTTPJSONFauxton

How does it compare?

apache/couchdbd4l3k/cs418emqx/emqx
Stars6,876—16,270
LanguageErlangErlangErlang
Last pushed—2017-04-27—
Maintenance—Dormant—
Setup difficultymoderateeasyhard
Complexity4/51/54/5
Audiencedeveloperdeveloperops devops

Figures from each repo's GitHub metadata at analysis time.

How do you get it running?

Difficulty · moderate Time to first run · 30min

Requires Erlang installed or a preconfigured VS Code dev container, full manual setup involves a configure-and-make sequence.

Apache 2.0, use freely for any purpose including commercial products, as long as you include the license and copyright notice.

So what is it?

Apache CouchDB is a database system that stores data as JSON documents and exposes everything through a standard HTTP API. JSON is the text format widely used across the web for exchanging data, and HTTP is the same protocol browsers use to load websites. This means you can interact with CouchDB using ordinary web tools and requests, without a special client library. The defining characteristic of CouchDB is its sync capability. Multiple copies of the database, running on different servers or devices, can each accept writes independently and then synchronize their changes with each other. The database is designed to handle conflicts that arise when the same data is changed in two places at once, making it suitable for applications that need to work offline or across distributed locations. CouchDB is written in Erlang, a programming language built for reliable, concurrent systems. It ships with a browser-based administration interface called Fauxton, which you access at a local web address after starting the server. Installation instructions for Unix-like systems and Windows are provided in separate files in the repository. A development environment can be started quickly using a preconfigured container setup in VS Code, or manually by installing dependencies and running a configure and make sequence. The README is brief and points to the project's full documentation site for detailed guidance. The project is part of the Apache Software Foundation and supported by several commercial sponsors. Full documentation, a changelog, and community mailing lists are available on the project website.

Copy-paste prompts

Prompt 1
I'm using Apache CouchDB. Write a JavaScript snippet that creates a new document, reads it back, and handles a conflict when two clients update the same document simultaneously.
Prompt 2
Show me how to set up CouchDB replication between two databases so they automatically stay in sync.
Prompt 3
I have a CouchDB database and want to query documents using a MapReduce view. Write an example view function and explain how to query it.
Prompt 4
Explain how CouchDB handles offline sync and conflict resolution in plain English, then give me a checklist for building an offline-first web app with it.

Frequently asked questions

What is couchdb?

A database that stores and syncs JSON documents over HTTP, letting multiple copies stay in sync across servers or devices even when offline.

What language is couchdb written in?

Mainly Erlang. The stack also includes Erlang, HTTP, JSON.

What license does couchdb use?

Apache 2.0, use freely for any purpose including commercial products, as long as you include the license and copyright notice.

How hard is couchdb to set up?

Setup difficulty is rated moderate, with roughly 30min to a first successful run.

Who is couchdb for?

Mainly developer.

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