Jonas Construction API
No API at all. Reviewers cite the lack of integration surface as a key limitation; there is no developer portal, REST or GraphQL endpoint, or SDK. Access is login or on-prem only, and custom reporting is restricted to a preset data list.
Frequently asked questions
Jonas Construction scores F on the API Report Card. No API at all. Reviewers cite the lack of integration surface as a key limitation; there is no developer portal, REST or GraphQL endpoint, or SDK. Access is login or on-prem only, and custom reporting is restricted to a preset data list.
Without a usable official API, teams fall back on manual exports, file drops, or one-off vendor integrations. The other option is an unofficial API layer like Supergood that automates the authenticated web app directly.
Jonas Construction Software is an integrated ERP for construction and service contractors, consolidating accounting (GL, AP/AR, payroll), job costing, project management (scheduling, change orders, RFIs), service management (work orders, dispatch, preventative maintenance), equipment, inventory, procurement, and document control into one system.
Construction, Typically for mechanical, HVAC, plumbing, electrical, fire/sprinkler, and specialty-trade contractors, from small shops to multi-location enterprises. Contractors run their back office and field operations, job costing, progress billing, payroll, AP/AR, service dispatch/work orders, preventative-maintenance contracts, and equipment/inventory, as the company's operational and financial system of record.
30+ years in the industry with 14,000+ users and a solid Capterra/SoftwareAdvice/G2 footprint (175+ reviews, ~79% satisfaction). Established mid-market construction/service ERP, though smaller than Procore/Sage.
Yes, General ledger, AP/AR, payroll, job costs, service work orders/dispatch, equipment and inventory. This is the contractor's core financial and operational system of record.
30+ years old. Legacy architecture (employees and users cite an 'age-old technology stack'); cloud hosting offered via Jonas Cloud but the core remains dated.
No API available; lack of integration with other software is a limitation. Custom reporting restricted to a limited preset data list. Full sourced list under Sources below.
Common alternatives include Sage 300 CRE, Foundation Software, Viewpoint (Trimble), ServiceTitan, Penta / Computer Guidance. Graded alternatives appear under "More from the report card" below.
Grades measure one thing: can a customer's engineering team get their own data out programmatically? We check six things (whether a real API exists, how access is gated, data coverage, auth quality, docs and developer experience, and stability) and roll them into a letter grade. Grades get re-verified, and they only move on evidence.
Yes. Supergood maintains an unofficial Jonas Construction API and MCP server so AI agents and internal tools can read and write Jonas Construction data. See the Jonas Construction integration docs at supergood.ai/docs/jonas-construction-api.