Capture and save JSON responses from web requests with URL filtering
// ==UserScript==
// @name JSON Response Capture
// @namespace http://tampermonkey.net/
// @version 1.3
// @description Capture and save JSON responses from web requests with URL filtering
// @author nickm8
// @license MIT
// @match *://*/*
// @grant none
// @require https://cdnjs.cloudflare.com/ajax/libs/react/18.2.0/umd/react.production.min.js
// @require https://cdnjs.cloudflare.com/ajax/libs/react-dom/18.2.0/umd/react-dom.production.min.js
// ==/UserScript==
(function() {
'use strict';
const style = document.createElement('style');
style.textContent = `
:root {
--bg-primary: #ffffff;
--bg-secondary: #f9fafb;
--text-primary: #1f2937;
--text-secondary: #4b5563;
--text-tertiary: #6b7280;
--border-color: #e5e7eb;
--shadow-color: rgba(0, 0, 0, 0.1);
--hover-color: #2563eb;
--danger-color: #dc2626;
--tag-bg: #f3f4f6;
}
@media (prefers-color-scheme: dark) {
:root {
--bg-primary: #1f2937;
--bg-secondary: #374151;
--text-primary: #f9fafb;
--text-secondary: #d1d5db;
--text-tertiary: #9ca3af;
--border-color: #4b5563;
--shadow-color: rgba(0, 0, 0, 0.3);
--hover-color: #60a5fa;
--danger-color: #ef4444;
--tag-bg: #374151;
}
}
.json-capture-panel {
position: fixed;
bottom: 1rem;
right: 1rem;
background: var(--bg-primary);
color: var(--text-primary);
border-radius: 0.5rem;
box-shadow: 0 4px 6px -1px var(--shadow-color);
transition: all 200ms;
z-index: 10000;
}
.json-capture-panel.minimized { width: 3rem; }
.json-capture-panel.expanded { width: 24rem; }
.json-capture-header {
display: flex;
align-items: center;
justify-content: space-between;
padding: 0.5rem;
border-bottom: 1px solid var(--border-color);
background: var(--bg-secondary);
border-top-left-radius: 0.5rem;
border-top-right-radius: 0.5rem;
}
.json-capture-content {
max-height: 24rem;
overflow: auto;
padding: 1rem;
}
.json-capture-item {
margin-bottom: 1rem;
padding: 0.5rem;
border: 1px solid var(--border-color);
border-radius: 0.375rem;
}
.json-capture-url {
font-size: 0.875rem;
color: var(--text-secondary);
margin-bottom: 0.25rem;
word-break: break-all;
}
.json-capture-timestamp {
font-size: 0.75rem;
color: var(--text-tertiary);
margin-bottom: 0.5rem;
}
.json-capture-json {
font-size: 0.75rem;
background: var(--bg-secondary);
padding: 0.5rem;
border-radius: 0.375rem;
overflow: auto;
white-space: pre-wrap;
max-height: 12rem;
color: var(--text-primary);
}
.json-capture-button {
padding: 0.25rem 0.5rem;
background: none;
border: none;
cursor: pointer;
color: var(--text-secondary);
}
.json-capture-button:hover {
color: var(--hover-color);
}
.json-capture-button.delete:hover {
color: var(--danger-color);
}
.config-section {
margin-bottom: 1rem;
padding: 0.5rem;
border: 1px solid var(--border-color);
border-radius: 0.375rem;
}
.config-title {
font-weight: 600;
margin-bottom: 0.5rem;
color: var(--text-primary);
}
.config-input {
display: flex;
gap: 0.5rem;
margin-bottom: 0.5rem;
}
.config-input input {
flex: 1;
padding: 0.25rem 0.5rem;
border: 1px solid var(--border-color);
border-radius: 0.25rem;
background: var(--bg-primary);
color: var(--text-primary);
}
.config-list {
display: flex;
flex-wrap: wrap;
gap: 0.25rem;
}
.config-tag {
background: var(--tag-bg);
color: var(--text-primary);
padding: 0.25rem 0.5rem;
border-radius: 0.25rem;
display: flex;
align-items: center;
gap: 0.25rem;
}
.config-tag button {
padding: 0;
background: none;
border: none;
cursor: pointer;
color: var(--text-tertiary);
}
.tabs {
display: flex;
border-bottom: 1px solid var(--border-color);
margin-bottom: 1rem;
}
.tab {
padding: 0.5rem 1rem;
cursor: pointer;
border-bottom: 2px solid transparent;
color: var(--text-secondary);
}
.tab.active {
border-bottom-color: var(--hover-color);
color: var(--hover-color);
}
`;
document.head.appendChild(style);
const { useState, useEffect } = React;
// Configuration component
function ConfigSection({ matches, ignores, onUpdateMatches, onUpdateIgnores }) {
const [newMatch, setNewMatch] = useState('');
const [newIgnore, setNewIgnore] = useState('');
const addMatch = () => {
if (newMatch && !matches.includes(newMatch)) {
onUpdateMatches([...matches, newMatch]);
setNewMatch('');
}
};
const addIgnore = () => {
if (newIgnore && !ignores.includes(newIgnore)) {
onUpdateIgnores([...ignores, newIgnore]);
setNewIgnore('');
}
};
const removeMatch = (match) => {
onUpdateMatches(matches.filter(m => m !== match));
};
const removeIgnore = (ignore) => {
onUpdateIgnores(ignores.filter(i => i !== ignore));
};
return React.createElement('div', { className: 'config-content' }, [
React.createElement('div', { key: 'matches', className: 'config-section' }, [
React.createElement('div', { className: 'config-title' }, 'URL Matches'),
React.createElement('div', { className: 'config-input' }, [
React.createElement('input', {
value: newMatch,
onChange: (e) => setNewMatch(e.target.value),
placeholder: 'Enter URL keyword to match',
onKeyPress: (e) => e.key === 'Enter' && addMatch()
}),
React.createElement('button', {
className: 'json-capture-button',
onClick: addMatch
}, '+')
]),
React.createElement('div', { className: 'config-list' },
matches.map(match =>
React.createElement('span', { key: match, className: 'config-tag' }, [
match,
React.createElement('button', {
onClick: () => removeMatch(match)
}, '×')
])
)
)
]),
React.createElement('div', { key: 'ignores', className: 'config-section' }, [
React.createElement('div', { className: 'config-title' }, 'URL Ignores'),
React.createElement('div', { className: 'config-input' }, [
React.createElement('input', {
value: newIgnore,
onChange: (e) => setNewIgnore(e.target.value),
placeholder: 'Enter URL keyword to ignore',
onKeyPress: (e) => e.key === 'Enter' && addIgnore()
}),
React.createElement('button', {
className: 'json-capture-button',
onClick: addIgnore
}, '+')
]),
React.createElement('div', { className: 'config-list' },
ignores.map(ignore =>
React.createElement('span', { key: ignore, className: 'config-tag' }, [
ignore,
React.createElement('button', {
onClick: () => removeIgnore(ignore)
}, '×')
])
)
)
])
]);
}
function JsonCapturePanel() {
const [captures, setCaptures] = useState([]);
const [isMinimized, setIsMinimized] = useState(true);
const [activeTab, setActiveTab] = useState('captures');
const [matches, setMatches] = useState([]);
const [ignores, setIgnores] = useState([]);
const domain = window.location.hostname;
// Load configuration from localStorage
useEffect(() => {
const config = JSON.parse(localStorage.getItem(`jsonCapture_${domain}`) || '{"matches":[],"ignores":[]}');
setMatches(config.matches);
setIgnores(config.ignores);
}, []);
// Save configuration to localStorage
useEffect(() => {
localStorage.setItem(`jsonCapture_${domain}`, JSON.stringify({ matches, ignores }));
}, [matches, ignores]);
const shouldCaptureUrl = (url) => {
if (matches.length === 0) return false;
return matches.some(match => url.includes(match)) &&
!ignores.some(ignore => url.includes(ignore));
};
useEffect(() => {
// Intercept fetch
const originalFetch = window.fetch;
window.fetch = async function(...args) {
const response = await originalFetch.apply(this, args);
const clone = response.clone();
try {
const contentType = clone.headers.get('content-type');
if (contentType && contentType.includes('application/json')) {
const url = typeof args[0] === 'string' ? args[0] : args[0].url;
if (shouldCaptureUrl(url)) {
const json = await clone.json();
setCaptures(prev => [...prev, {
timestamp: new Date().toISOString(),
url,
data: json
}]);
}
}
} catch (err) {
console.error('Error processing response:', err);
}
return response;
};
// Intercept XHR
const originalXHROpen = XMLHttpRequest.prototype.open;
const originalXHRSend = XMLHttpRequest.prototype.send;
XMLHttpRequest.prototype.open = function(...args) {
this._url = args[1];
return originalXHROpen.apply(this, args);
};
XMLHttpRequest.prototype.send = function(...args) {
this.addEventListener('load', function() {
try {
const contentType = this.getResponseHeader('content-type');
if (contentType && contentType.includes('application/json')) {
if (shouldCaptureUrl(this._url)) {
const json = JSON.parse(this.responseText);
setCaptures(prev => [...prev, {
timestamp: new Date().toISOString(),
url: this._url,
data: json
}]);
}
}
} catch (err) {
console.error('Error processing XHR response:', err);
}
});
return originalXHRSend.apply(this, args);
};
}, [matches, ignores]);
const handleSave = () => {
const blob = new Blob([JSON.stringify(captures, null, 2)], { type: 'application/json' });
const url = URL.createObjectURL(blob);
const a = document.createElement('a');
a.href = url;
a.download = `json-captures-${domain}-${new Date().toISOString()}.json`;
a.click();
URL.revokeObjectURL(url);
};
const handleClear = () => {
setCaptures([]);
};
return React.createElement('div', {
className: `json-capture-panel ${isMinimized ? 'minimized' : 'expanded'}`
}, [
// Header
React.createElement('div', {
key: 'header',
className: 'json-capture-header'
}, [
!isMinimized && React.createElement('div', {
key: 'title'
}, `JSON Captures (${captures.length})`),
React.createElement('div', {
key: 'controls',
style: { display: 'flex', gap: '0.5rem' }
}, [
!isMinimized && React.createElement('button', {
key: 'save',
className: 'json-capture-button',
onClick: handleSave,
title: 'Save captures'
}, '💾'),
React.createElement('button', {
key: 'toggle',
className: 'json-capture-button',
onClick: () => setIsMinimized(!isMinimized),
title: isMinimized ? 'Expand' : 'Minimize'
}, isMinimized ? '⤢' : '⤡'),
!isMinimized && React.createElement('button', {
key: 'clear',
className: 'json-capture-button delete',
onClick: handleClear,
title: 'Clear captures'
}, '✕')
])
]),
// Content
!isMinimized && React.createElement('div', { key: 'content' }, [
// Tabs
React.createElement('div', { key: 'tabs', className: 'tabs' }, [
React.createElement('div', {
className: `tab ${activeTab === 'captures' ? 'active' : ''}`,
onClick: () => setActiveTab('captures')
}, 'Captures'),
React.createElement('div', {
className: `tab ${activeTab === 'config' ? 'active' : ''}`,
onClick: () => setActiveTab('config')
}, 'Configuration')
]),
// Tab content
activeTab === 'captures' ?
React.createElement('div', {
key: 'captures',
className: 'json-capture-content'
},
captures.length === 0
? React.createElement('div', {
style: { textAlign: 'center', color: '#6b7280' }
}, matches.length === 0 ? 'Configure URL matches to start capturing' : 'No JSON responses captured yet')
: captures.map((capture, index) =>
React.createElement('div', {
key: index,
className: 'json-capture-item'
}, [
React.createElement('div', {
key: 'url',
className: 'json-capture-url'
}, capture.url),
React.createElement('div', {
key: 'timestamp',
className: 'json-capture-timestamp'
}, capture.timestamp),
React.createElement('pre', {
key: 'json',
className: 'json-capture-json'
}, JSON.stringify(capture.data, null, 2))
])
)
)
: React.createElement(ConfigSection, {
key: 'config',
matches,
ignores,
onUpdateMatches: setMatches,
onUpdateIgnores: setIgnores
})
])
]);
}
const container = document.createElement('div');
document.body.appendChild(container);
ReactDOM.render(React.createElement(JsonCapturePanel), container);
})();