aid: invoice-ninja
name: Invoice Ninja
description: >-
  Invoice Ninja is an open-source invoicing, billing, payments, and
  expense tracking platform for freelancers and small businesses,
  available both as a self-hosted application and a managed SaaS at
  invoicing.co. The Invoice Ninja v5 REST API exposes full CRUD access
  to clients, invoices, quotes, payments, products, recurring invoices,
  expenses, projects, and tasks, authenticated with an API token
  (plus an optional secret) passed via HTTP headers.
type: Index
image: https://kinlane-productions.s3.amazonaws.com/apis-json/apis-json-logo.jpg
tags:
  - Invoicing
  - Billing
  - Payments
  - Accounting
  - Open Source
  - Freelancers
  - SMB
url: >-
  https://raw.githubusercontent.com/api-evangelist/invoice-ninja/refs/heads/main/apis.yml
created: '2026-05-11'
modified: '2026-05-11'
specificationVersion: '0.19'
apis:
  - aid: invoice-ninja:v5-api
    name: Invoice Ninja v5 API
    description: >-
      REST API for the Invoice Ninja v5 platform covering clients,
      invoices, quotes, payments, products, recurring invoices,
      credits, expenses, projects, tasks, and company settings.
      Authentication is via an X-Api-Token header (with an optional
      X-Api-Secret for self-hosted installs).
    humanURL: https://api-docs.invoicing.co
    baseURL: https://invoicing.co
    tags:
      - Invoicing
      - Billing
      - Payments
      - Clients
      - Products
    properties:
      - type: Documentation
        url: https://api-docs.invoicing.co
      - type: OpenAPI
        url: https://app.swaggerhub.com/apis/invoiceninja/invoiceninja
      - type: Developer Guide
        url: https://invoiceninja.github.io/en/developer-guide/
      - type: API Reference
        url: https://invoiceninja.github.io/docs/api-reference/invoice-ninja-api-reference

common:
  - type: Website
    url: https://www.invoiceninja.com
  - type: Documentation
    url: https://api-docs.invoicing.co
  - type: Pricing
    url: https://www.invoiceninja.com/pricing/
  - type: Sign Up
    url: https://app.invoicing.co/signup
  - type: GitHub Organization
    url: https://github.com/invoiceninja
  - type: Source Code
    url: https://github.com/invoiceninja/invoiceninja
maintainers:
  - FN: Kin Lane
    email: kin@apievangelist.com