Open source · No account required

The HTTP workbench.

Inspect HTTP, debug APIs, and keep collections beside your code. HarborClient is a focused desktop tool for developers who need to understand what actually happened.

Download HarborClient See the workflow

macOS, Windows and LinuxImport Postman and BrunoGit-backed collections

HarborClient — payments-api

POST

{{baseUrl}}/v1/session

Send

ParamsHeaders 4AuthBodyTests

Content-Type: application/json
Authorization: Bearer {{accessToken}}
X-Request-ID: debug-2481
Cookie: session={{sessionCookie}}

{
   "authenticated": true, 
   "userId": "usr_2837", 
   "session": { 
     "expiresIn": 3600, 
     "scope": "payments:write"
  }
}

See what was actually sent.

Inspect redirects, cookies, headers and response timing without leaving the request.

◇ Open source

⌘ Keyboard focused

Git Git-backed

{ } Extensible

◎ No account

Debugging

See the whole request.

An API failure can hide between what you configured, what the client sent, and what the server returned. HarborClient keeps all three visible.

01 / INTENDED

The request you configured

Review variables, authentication, scripts, cookies and headers before the request leaves your machine.

POST /v1/payment
Authorization: Bearer {{token}}
Content-Type: application/json

02 / SENT

The request on the wire

Inspect the resolved URL, final headers, redirects and payload after variables and scripts have run.

→ POST https://api.example.dev/v1/payment
→ cookie: session missing
→ redirect: 307

03 / RECEIVED

The response that came back

Read status, headers, timing and body together so symptoms do not get mistaken for causes.

← 401 Unauthorized
← WWW-Authenticate: Bearer
← 87 ms

Developer workflow

Built beside your code.

API requests are development artifacts. Keep them close to the editor, terminal, logs and version history you already use.

Change the backendEdit code and restart the local service.

Send and inspectTest the endpoint without losing debugging context.

Review the diffCommit request changes with the code they support.

payments-servicesrc/routes/payment.tsfeature/idempotency

payment.ts

18export async functioncreatePayment(req, res) {

19 const idempotencyKey =

20 req.headers[ 'idempotency-key'];

22 if (!idempotencyKey) {

23 return res.status( 400 ).json({

24 error: 'Missing idempotency key'

25 });

26 }

28 return paymentService.create(req.body);

29}

REQUEST CHANGESfeature/idempotency

collections/payments/create-payment.hc

- "X-Request-ID": "{{requestId}}"

+ "X-Request-ID": "{{requestId}}",

+ "Idempotency-Key": "{{$uuid}}"

environments/local.hce

- "baseUrl": "http://localhost:3000"

+ "baseUrl": "http://localhost:4310"

✓ Tests passed · 3 assertions

Craft

Small details, repeated all day.

Good developer tools do not demand attention. They reduce friction through careful interaction design, legible information and predictable behavior.

Keyboard first without becoming keyboard only.

Move between requests, send, search and inspect without breaking concentration. Visible focus and accessible controls help power users and keyboard users alike.

Send request⌘↵

Open command menu⌘K

Find request⌘P

Next request⌥↓

Readable responses

Clear hierarchy, deliberate contrast and structured inspection help you find the important line faster.

↺

Predictable state

Collection history, environments and request changes remain inspectable instead of disappearing into an opaque cloud.

Migration

Bring the work you already have.

Import existing collections, verify the result, and improve your workflow gradually. Switching tools should not mean rebuilding every request.

Postman collectionsBruno collectionsOpenAPIcURL

Start with an import

Import into HarborClient

payments.postman_collection.json

24 requests · 4 environments

Ready

identity-service

Bruno collection · Git repository

Ready

API

openapi.yaml

OpenAPI 3.1 · 18 operations

Ready

Review variables, authentication and scripts before saving.

Extend the workbench

Focused at the center. Flexible at the edges.

HarborClient stays useful across different teams without turning every possible workflow into a permanent core feature.

EXT

Plugins

Add integrations and workflow-specific behavior without expanding the core interface.

Your storage

Work with Git, SQLite, PostgreSQL, MySQL or Firestore according to the needs of the project.

Bring your own AI

Use supported AI workflows with keys and providers under your control.

TEAM

Team Hub

Share collections through self-hosted infrastructure when the team needs more than Git.

Trust

Inspect the tool, too.

A client handling credentials and production requests should be transparent about how it is built, distributed and maintained.

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Open-source code Review the application, follow development and verify how HarborClient works.

MIT

Clear licensing HarborClient is released under a permissive open-source license.

SEC

Published security process Security reporting, release information and verification guidance remain easy to find.

0×

No required account Install the desktop client and begin working without creating a hosted account.

The HTTP workbench

Debug the request. Not the tool.

Download HarborClient and put a focused HTTP workbench beside your editor, terminal and logs.

Download free Read the guide

No account required · macOS, Windows and Linux