JMESPath

About JMESPath

The JMESPath free API is a serverless endpoint that evaluates JMESPath query expressions against JSON data submitted in a POST request body. Users send a "data" object or array and a "query" string, and the endpoint returns the transformed result as JSON. It supports filtering, projections, sorting, reversing, slicing, and reshaping nested payloads into flat structures.

The endpoint is public, requires no authentication, and has CORS enabled, allowing calls directly from browsers, no-code platforms such as Zapier, Make, or n8n, and automation scripts. It is provided by Note API Connector, a tool for syncing external data into Notion, and can be used as a step to reshape API responses before syncing to Notion, though it is also usable independently for general JSON transformation. Malformed queries return a 400 response with a descriptive error message.

The service is intended for prototyping, demos, and low-volume automations rather than production or high-volume use, since it offers no SLA or guaranteed throughput. The provider states the endpoint processes and returns data without persisting or sharing payloads, and advises against sending secrets or sensitive data.

Key features

• Serverless POST endpoint for evaluating JMESPath expressions against JSON data
• Supports filtering, projections, sorting, reversing, slicing, and reshaping nested payloads
• CORS enabled for direct calls from browsers and no-code tools like Zapier, Make, or n8n
• No authentication required for testing
• Returns descriptive 400 errors for malformed or invalid queries

Frequently asked questions