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Chapar
A fast, private and offline API client for REST, gRPC, GraphQL and WebSocket services
Native API client supporting REST, gRPC, GraphQL and WebSocket with built-in traffic proxy, local-only data and no telemetry.
Overview
Chapar is a fast, native API client built with Go for testing REST, gRPC, GraphQL and WebSocket services. It features a built-in proxy for inspecting other apps' traffic, draws its UI on the GPU with Yoga for fast startup and lightweight performance, and runs consistently across macOS, Linux and Windows without requiring a browser engine.
Requests, environments and cookies are stored as plain files on your machine with no account, cloud sync or telemetry. The application supports Python scripting with pre and post-request scripts, test cases with assertions and captures for CI integration, and can be run from the command line with chapar-cli.
Chapar includes traffic proxy capabilities to capture HTTPS traffic from any app or phone and open requests directly in the client. Collections and requests can be exported as cURL commands or HAR format, and the tool supports importing Postman collections, OpenAPI specs and proto files.
Feature facts
- REST and HTTP with every method, query and path params, JSON, XML, text, form-data, URL-encoded and binary bodies
- gRPC with server reflection or proto files, unary and server-streaming calls, metadata and trailers, TLS and mutual TLS
- GraphQL queries and variables with data and errors split out
- WebSocket text, JSON and binary messages with live message log
- Traffic proxy to capture HTTP(S) traffic of apps and phones
- Python scripting for pre and post-request scripts with tests
- Test cases and CI integration with chapar-cli
- Environments with variables and secret values encrypted with OS keychain
- Import Postman collections, OpenAPI specs and proto files
- Code generation for cURL, Python, Go, JavaScript, Java, Ruby and .NET
Pricing
Pricing model: Open source
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Chapar specifications
| Section | Developer Tools |
|---|---|
| Website | chapar.rest |
| Makers | Mohsen Mirzakhani (Founder) |
| Votes2 | 0 |
Chapar metrics
| Metric | Value |
|---|---|
| Domain Rating | 6 no change since last check |
| Trust Flow | 5 no change since last check |
| Citation Flow | 26 no change since last check |
| Referring domains | 31 no change since last check |
| External backlinks | 182 no change since last check |
Fact: Ahrefs Domain Rating checked 12 Nov 2026, fact changed 29 Oct 2026. Fact: top topic Computers/Internet/Web Design and Development (5). Fact: Majestic checked 29 Oct 2026, fact changed 29 Oct 2026. Link facts from Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.
Chapar domain fact sheet
Open the fact sheet
| Domain age | 2 years |
|---|---|
| Registered | |
| Expires | |
| Registrar | Domain.com - Network Solutions, LLC |
| DNSSEC | Not signed |
Chapar launch receipt sheet
What we have measured for Chapar since it went live on SaaS Directory Info on 29 October 2026.
- 6 Domain Rating (Ahrefs) no change since launch
at launch: 6 (29 Oct 2026); latest: 11 Nov 2026 - 5 Trust Flow (Majestic)
first measured 29 Oct 2026 - 31 Referring domains (Majestic)
first measured 29 Oct 2026
Day 13 since launch. Next receipt: day 30, 28 Nov 2026. The figures report a change; they do not say what caused it, and many things can. No figure here is a guess.
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Frequently looked up
- Q1What programming language is Chapar built with?
- Chapar is a single binary written in Go with UI built using Yoga, a GPU-rendered UI toolkit, and Python scripts running in a sandboxed executor container.
- Q2What is the origin of the name Chapar?
- Chapar was the institution of royal mounted couriers in ancient Persia who carried messages along the Royal Road. The network allowed messages to be transported from Susa to Sardis (2699 km) in nine days, compared to ninety days on foot.
- Q3What are the project goals of Chapar?
- The goal is to make it easy for individuals and teams to test their APIs with ease, focusing on speed, privacy and keeping API collections as files you own next to your code.
- Q4What is the current development status of Chapar?
- Chapar is under active development. Version 0.7.0 introduced a GPU-rendered UI, 0.10.0 added WebSocket requests, 0.11.0 added the traffic proxy, and MQTT support is next on the roadmap.
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Chapar has a free listing. The owner can unlock the full profile with a paid launch for $5:
- Founder story (locked)
- Milestones (locked)
- Demo video (locked)
- Dofollow website link (locked)
See also
| Product | Origin | DR1 | Votes2 |
|---|---|---|---|
| liquid-technologiesXML code generator for C# and Visual Basic .Net that creates strongly typed object models from XML schemas | United Kingdom | 70 | 0 votes. Log in to vote for liquid-technologies in the file |
 APIGitGit-native platform for building, publishing, sharing, and securing APIs | United States | 36 | 0 votes. Log in to vote for APIGit in the file |
 eryxWebAssembly sandbox for running untrusted Python safely | not stated | 0 | 0 votes. Log in to vote for eryx in the file |
 TestFlows MachineRun your programs deterministically. Record, replay, and branch your runs. | not stated | 2 | 0 votes. Log in to vote for TestFlows Machine in the file |