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Server API Specification

LibrePCB provides an API at which is used by the LibrePCB application, for example to fetch the latest libraries.

The API uses JSON for responses.


An API URL consists of following parts:

Part Description Example
<BASE> Base URL of API server
/api Base path of API /api
/<VERSION> API version number /v1
/<RESOURCE> Path to the requested resource /libraries/v0.1

The base URL of the official API server is, but for your own API server you can use any other base URL. This is the URL which must be specified in the workspace settings of LibrePCB.

Currently the only available API version is v1, but in future there might be newer API specifications available with higher version numbers. Because the version number is part of the URL, a server could support multiple API versions at the same time.


Request the list of libraries:

curl ''


The API uses pagination (i.e. splitting large responses across several shorter responses) to keep the response time of requests short.

A paginated response contains following JSON entries:

Key Type Description
count integer Total count of results over all pages
next string URL of next page (null for last page)
previous string URL of previous page (null for first page)
results list The actual response objects


Here an example how a paginated response looks like:


curl ''


"count": 42,
"next": "",
"previous": null,
"results": [

Available Resources

Following resources are available:

Path Description
/libraries Fetch list of available libraries


The resource path /libraries is used to fetch the list of all available libraries. It is used in the LibrePCB Library Manager to list and download libraries.

The file format version of the application needs to be appended to the path to fetch only libraries with compatible file format. For example if the application uses file format version 0.1, use the path /api/v1/libraries/v0.1. Note that the response can still contain libraries with a file format older than the specified one. But it will never contain libraries with a newer file format.

The response is a list of objects with following properties:

Name Type Description
uuid string UUID of the library (from library.lp)
name object Library name, multilingual (from library.lp)
description object Library description, multilingual (from library.lp)
keywords object Library keywords, multilingual (from library.lp)
author string Author of the library (from library.lp)
version string Version of the library (from library.lp)
deprecated boolean Deprecated flag (from library.lp)
url string URL of library (from library.lp)
dependencies list List of dependent library UUIDs (from library.lp)
component_categories integer Count of contained component categories
package_categories integer Count of contained package categories
symbols integer Count of contained symbols
packages integer Count of contained packages
components integer Count of contained components
devices integer Count of contained devices
recommended boolean Whether the library is recommended to install
updated_at string ISO 8601 datetime of last update
format_version string File format of the library (from .librepcb-lib)
icon_url string URL to library icon (null if N/A)
download_url string URL to file for downloading the library (*.zip)
download_size integer Size of file to download in bytes (null if unknown)
download_sha256 string SHA256 of file to download (null if unknown)



curl ''

Response (without pagination):

"uuid": "e3ce49bf-e959-4092-8b48-aeead756f8d1",
"name": {
"default": "Molex",
"en_US": "Molex"
"description": {
"default": "Connectors, Sockets and more"
"keywords": {
"default": "connector,molex"
"author": "LibrePCB",
"version": "0.0.1",
"deprecated": false,
"url": "",
"dependencies": [
"component_categories": 13,
"package_categories": 37,
"symbols": 123,
"packages": 321,
"components": 42,
"devices": 0,
"recommended": false,
"updated_at": "2018-04-13T12:43:52Z",
"format_version": "0.1",
"icon_url": "",
"download_url": "",
"download_size": null,
"download_sha256": null,