mockr-tui

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A TUI-based HTTP mock server for development.

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Features

Core	Advanced	Developer Experience
Path parameters ({id})	Weighted multi-response	Terminal UI with live logs
Catch-all patterns ({*path})	Conditional responses	Hot-reload configuration
CORS support	Response templating	Runtime port settings
Configurable delays	JSONPath body matching	Request filtering & detail search
		JSON syntax highlighting
		Export log to JSON / copy curl
		Endpoint detail preview
		Stats bar with request counts

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Quick Start

# 1. Install
cargo install mockr-tui

# 2. Create config
mockr --init

# 3. Run
mockr

That's it! Your mock server is running at http://127.0.0.1:8080.

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Installation

Package Managers

Cargo (recommended):

cargo install mockr-tui

Cargo binstall (faster, pre-built binary):

cargo binstall mockr-tui

Arch Linux (AUR):

yay -S mockr-tui      # From source
yay -S mockr-tui-bin  # Pre-built binary

Pre-built Binaries

Download from the releases page.

Linux:

curl -fsSL https://code.byjokese.net/byjokese/mockr-tui/raw/branch/main/dist/install.sh | sh

Windows (PowerShell):

irm https://code.byjokese.net/byjokese/mockr-tui/raw/branch/main/dist/install.ps1 | iex

Build from Source

git clone https://code.byjokese.net/byjokese/mockr-tui.git
cd mockr-tui
cargo install --path .

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Usage

mockr                    # Use default mockr.json
mockr -c config.json     # Use specific config file
mockr -p 3000            # Override port
mockr --headless         # Run without TUI (server only)

CLI Options

Option	Default	Description
-c, --config <FILE>	mockr.json	Path to configuration file
-p, --port <PORT>	from config	Override server port
-H, --host <HOST>	from config	Override server host
--no-watch	false	Disable hot reload
--headless	false	Run HTTP server only (no TUI)
--init	-	Create a starter configuration file

---

Configuration

Basic Example

{
  "server": {
    "host": "127.0.0.1",
    "port": 8080
  },
  "endpoints": [
    {
      "name": "Get Users",
      "path": "/api/users",
      "method": "GET",
      "response": {
        "status": 200,
        "body": [
          { "id": 1, "name": "Alice" },
          { "id": 2, "name": "Bob" }
        ]
      }
    }
  ]
}

Server Options

Option	Default	Description
host	127.0.0.1	Host to bind to
port	8080	Port to listen on
cors.enabled	true	Enable CORS
cors.origins	["*"]	Allowed origins
cors.methods	["GET", "POST", ...]	Allowed methods
cors.allow_credentials	true	Allow credentials (cookies, auth headers). When true with wildcard origins, the server mirrors the request Origin header instead of sending *

Endpoint Options

Option	Required	Description
path	Yes	URL path pattern
method	Yes	HTTP method (GET, POST, PUT, DELETE, PATCH, HEAD, OPTIONS, ANY)
name	No	Human-readable name
description	No	Description
enabled	No	Active state (default: true)
response	No	Single response configuration
responses	No	Multiple weighted/conditional responses
delay_ms	No	Fixed response delay (ms)
delay_range_ms	No	Random delay range [min, max]
priority	No	Higher priority matches first (default: 0)

Path Patterns

/api/users           # Exact match
/api/users/{id}      # Path parameter - captures "id"
/files/{*path}       # Catch-all - captures entire remaining path

Response Options

Option	Default	Description
status	200	HTTP status code
headers	{}	Response headers
body	null	Response body (string or JSON)
body_file	-	Path to file containing response body
content_type	application/json	Content-Type header

Request Matching

Match requests based on headers, query parameters, or body content:

{
  "path": "/api/data",
  "method": "POST",
  "request": {
    "headers": { "Authorization": "Bearer.*" },
    "query_params": { "type": "admin" },
    "body_contains": "important",
    "body_json_path": { "$.user.role": "admin" }
  },
  "response": {
    "status": 200,
    "body": { "matched": true }
  }
}

Matcher	Description
headers	Match request headers (supports regex)
query_params	Match query string parameters
body_contains	Match if body contains substring
body_json_path	Match JSON body using JSONPath expressions

Response Templating

Response bodies and headers support dynamic template variables:

Variable	Description
{{timestamp}}	ISO 8601 timestamp
{{timestamp_unix}}	Unix timestamp (seconds)
{{uuid}}	Random UUID v4
{{request.method}}	HTTP method
{{request.path}}	Request path
{{request.query}}	Query string
{{request.header.Name}}	Request header value
{{path.param}}	Path parameter value

{
  "path": "/api/users/{id}",
  "method": "GET",
  "response": {
    "headers": { "X-Request-Id": "{{uuid}}" },
    "body": {
      "id": "{{path.id}}",
      "requested_at": "{{timestamp}}"
    }
  }
}

Multiple Responses

Weighted random selection:

{
  "path": "/api/flaky",
  "method": "GET",
  "responses": [
    { "status": 200, "body": { "ok": true }, "weight": 8 },
    { "status": 500, "body": { "error": "Server error" }, "weight": 2 }
  ]
}

Conditional responses:

{
  "path": "/api/users",
  "method": "GET",
  "responses": [
    {
      "when": { "headers": { "X-Admin": "true" } },
      "status": 200,
      "body": { "users": ["all", "users"] }
    },
    {
      "status": 200,
      "body": { "users": ["public", "only"] }
    }
  ]
}

The first matching when condition is selected; responses without when act as fallback.

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Keyboard Shortcuts

Key	Action
Tab / Shift+Tab	Next / previous panel
1 / 2 / 3	Jump to panel
↑ / k, ↓ / j	Navigate up/down
PgUp / PgDn	Page up/down
Home / End	Go to top/bottom
Ctrl+u / Ctrl+d	Half-page scroll (Detail View)
Enter	View details (request or endpoint)
Space	Toggle endpoint
r	Reload config
c	Clear request log
e	Export log to JSON
y	Copy curl command to clipboard
Y	Copy response body to clipboard
/	Start filtering (Request Log) / search (Detail View)
n / N	Next / previous search match (Detail View)
s	Settings
? / F1	Show help
Esc	Close popup / Clear filter or search
q / Ctrl+c	Quit

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Editor Autocompletion

The --init command includes a $schema reference for JSON autocompletion. If your editor reports the URL as untrusted, add the domain to your editor's trusted schemas:

VS Code — add to settings.json:

{
  "json.schemas": [
    {
      "fileMatch": ["mockr.json"],
      "url": "https://code.byjokese.net/byjokese/mockr-tui/raw/branch/main/mockr-schema.json"
    }
  ]
}

Alternatively, download mockr-schema.json to your project and use "$schema": "./mockr-schema.json".

License

MIT