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The API Client that simply works

A fast, private and offline API client for your REST, gRPC and GraphQL services

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Free and open source · macOS, Windows and Linux

Chapar sending a REST request to the Chapar mock server

REST, gRPC and GraphQL

Every HTTP method and body type, gRPC with reflection or proto files, TLS and streaming, and GraphQL queries.

Fast and Private

A native app drawn on the GPU. Local-only data, secrets encrypted with your OS keychain, and zero telemetry.

Python Scripting

Pre and post-request scripts with tests, for HTTP, gRPC and GraphQL, in a sandboxed executor.

Test Cases and CI

Chain requests into test cases with assertions and captures, then run them in CI with chapar-cli.

Configuration as Files

Spaces, requests and environments are YAML files you can review and share in git.

Import What You Have

Postman collections and environments, OpenAPI specs, proto files and curl commands.