# Murmurations Library API

The purpose of the Library API is to replicate the list of fields and schemas so that they are stored in at least one more location, thus removing the GitHub library repo as a single point of failure.

The Index and Murmurations profile generators (MPGs) can access the schema list from the Library and then download the schemas from our CDN.

The service running the Library API will regularly synchronize with the GitHub library repo to ensure it is up-to-date with the list of fields and schemas on both the main (for production environment) and staging (for test environment) branches.

# Raw Data Endpoints

Schemas and fields can be downloaded directly from the Murmurations CDN. For example, a test schema can be accessed at:

https://test-cdn.murmurations.network/schemas/test_schema-v2.0.0.json (opens new window)

And the Name field referenced in the above schema can be accessed at:

https://test-cdn.murmurations.network/fields/name.json (opens new window)

# Index & Node UI Endpoints


Test Environment

Production Environment

📘 API Docs

https://app.swaggerhub.com/apis-docs/MurmurationsNetwork/LibraryAPI/1.0 (opens new window)

# GET /schemas (opens new window)

# Input

  • A standard GET request with no additional parameters


When the list of schemas starts to become large, we can add parameters for searching by schema name or ID, schemas using a specific field, date/time last updated, etc.

# Output

  • JSON array of schemas with some basic information about them
  "data": [
      "title": "Test Schema",
      "description": "Just for testing.",
      "name": "test_schema-v2.0.0",
      "url": "https://murmurations.network/schemas/test_schema"
  • title is the same as defined in the schema
  • description is the same as defined in the schema
  • name is the filename (without the .json extension) of the schema as stored in the library
  • url is a link to a web page where one can learn more about the schema from its creators. The web page should include information about the schema's purpose, a CHANGELOG describing changes made between versions and any other relevant information that could be useful to the node operator who is considering to use the schema.

All of the information above is pulled from the schema as it is recorded in the library, either from its JSON Schema-related contents (title & description) or from its metadata.schema (name, version, url):

  "$schema": "https://json-schema.org/draft-07/schema#",
  "$id": "https://test-cdn.murmurations.network/schemas/test_schema-v2.0.0.json",
  "title": "Test Schema",
  "description": "Just for testing.",
  "type": "object",
  "properties": {
    "linked_schemas": {
      "$ref": "../fields/linked_schemas.json"
    "name": {
      "$ref": "../fields/name.json"
    "latitude": {
      "$ref": "../fields/latitude.json"
    "longitude": {
      "$ref": "../fields/longitude.json"
  "required": [
  "metadata": {
    "creator": {
      "name": "Murmurations Network",
      "url": "https://murmurations.network/"
    "schema": {
      "name": "test_schema-v2.0.0",
      "purpose": "A test schema for creating test profiles.",
      "url": "https://murmurations.network/schemas/test_schema"

# Library Repo

The Library repository (opens new window) is for storing and curating Murmurations schemas and fields.

Additions or modifications to the Library occur through pull requests to the repo.

Schemas are created by specific networks or interest groups, and they are added to this repo by pull request. Learn more about creating schemas in the Create a Schema Guide.

# Overview

A schema is a group of fields (data points) that together provide information that is useful to aggregators who present that data in meaningful ways. Schemas define the composition of fields, and fields define the type and validation rules for data.

An example of field composition in a schema can be seen in this test schema (opens new window).

Note how fields are defined separately, including information about their type and other validation rules. For example, see how the name field (opens new window) is defined.

# Validation

All schemas and fields must validate against the JSON Schema (opens new window) vocabulary for annotating and validating JSON documents.

A useful online validation tool can be found at: https://www.jsonschemavalidator.net/ (opens new window)

Schemas and fields in the Murmurations library are validated against JSON Schema Draft 7.