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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1"/>
<title>Free Query String ↔ JSON — URL params encoder/decoder — Veriton</title>
<meta name="description" content="Free browser-only URL query string ↔ JSON converter. Parse, edit, and rebuild search params with multi-value keys, nested brackets, and form-urlencoded. No upload, no account."/>
<meta property="og:title" content="Free Query String ↔ JSON — Veriton"/>
<meta property="og:description" content="Paste a URL or ?a=1&b=2 → JSON object. Edit keys, rebuild query or full URL. Multi-value + nested bracket keys. Free forever, nothing uploaded."/>
<meta property="og:image" content="https://veriton-dev.github.io/veriton-micro-dev/assets/query-string-og.jpg"/>
<meta property="og:image:width" content="1280"/>
<meta property="og:image:height" content="720"/>
<meta name="twitter:card" content="summary_large_image"/>
<meta name="twitter:image" content="https://veriton-dev.github.io/veriton-micro-dev/assets/query-string-og.jpg"/>
<link rel="canonical" href="https://veriton-dev.github.io/veriton-micro-dev/tools/query-string.html"/>
<style>
*{box-sizing:border-box}body{font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;margin:0;color:#14181f;background:#f7f8fa;line-height:1.5}
.wrap{max-width:54rem;margin:0 auto;padding:1.1rem 1rem 2.5rem}
.hero{background:#111827;color:#fff;border-radius:14px;padding:1.3rem 1.2rem;margin-top:.6rem}
.hero h1{margin:0 0 .35rem;font-size:1.45rem}.hero p{margin:.35rem 0;color:#cbd5e1;font-size:.95rem}
.badge{display:inline-block;background:#22c55e;color:#052e16;font-weight:700;font-size:.75rem;padding:.15rem .55rem;border-radius:999px;margin-bottom:.45rem}
.grid{display:grid;gap:.8rem;margin:1rem 0}@media(min-width:900px){.grid{grid-template-columns:1fr 1fr}}
label{display:block;font-weight:700;font-size:.9rem;margin:0 0 .35rem}
textarea,pre,select,input[type=text]{width:100%;font:12.5px/1.45 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;border:1px solid #d1d5db;border-radius:10px;padding:.7rem;background:#fff}
textarea{min-height:200px;resize:vertical}
pre{min-height:120px;overflow:auto;background:#0b1220;color:#a7f3d0;margin:0;white-space:pre-wrap;word-break:break-all}
.row{display:flex;flex-wrap:wrap;gap:.5rem;align-items:center;margin:.6rem 0}
button,.btn{appearance:none;border:0;border-radius:9px;padding:.55rem .9rem;font-weight:700;cursor:pointer;text-decoration:none;display:inline-block;font-size:.92rem}
button.primary{background:#111827;color:#fff}button.secondary{background:#fff;color:#111827;border:1px solid #d1d5db}
.btn.green{background:#22c55e;color:#052e16}.btn.ghost{background:#fff;color:#111827;border:1px solid #d1d5db}
.card{background:#fff;border:1px solid #e5e7eb;border-radius:12px;padding:1rem;margin:1rem 0}
.muted{color:#6b7280;font-size:.88rem}
.stat{font-size:.85rem;color:#065f46;background:#ecfdf5;border:1px solid #a7f3d0;border-radius:8px;padding:.45rem .65rem}
footer{color:#6b7280;font-size:.85rem;margin-top:1.4rem;border-top:1px solid #e5e7eb;padding-top:.9rem}
.err{color:#991b1b;background:#fef2f2;border:1px solid #fecaca;border-radius:8px;padding:.5rem .7rem;display:none}
.opts{display:grid;gap:.55rem;grid-template-columns:repeat(auto-fit,minmax(11rem,1fr));margin:.5rem 0}
.opt{background:#f9fafb;border:1px solid #e5e7eb;border-radius:10px;padding:.55rem .7rem}
.opt label{margin:0 0 .25rem;font-size:.8rem}
.opt select,.opt input{padding:.4rem .5rem;font-size:.85rem}
.pill{display:inline-block;border-radius:999px;padding:.1rem .55rem;font-size:.72rem;font-weight:800;margin-right:.35rem;background:#dbeafe;color:#1e3a8a}
.kv{display:grid;gap:.45rem;margin-top:.4rem}
.kv div{display:grid;grid-template-columns:9.5rem 1fr;gap:.5rem;align-items:start;font-size:.9rem}
.kv .k{color:#6b7280;font-weight:700}.kv .v{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;word-break:break-all}
table.pairs{width:100%;border-collapse:collapse;font-size:.82rem;margin-top:.5rem}
table.pairs th,table.pairs td{border:1px solid #e5e7eb;padding:.35rem .45rem;text-align:left;vertical-align:top}
table.pairs th{background:#f3f4f6}
table.pairs td.k{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-weight:700;width:32%}
table.pairs td.v{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;word-break:break-all}
.tabs{display:flex;flex-wrap:wrap;gap:.35rem;margin:.4rem 0}
.tabs button{background:#f3f4f6;color:#111827;border:1px solid #e5e7eb}.tabs button.on{background:#111827;color:#fff;border-color:#111827}
</style>
</head>
<body>
<div class="wrap">
<p class="muted" style="margin:.2rem 0"><a href="../">← Veriton Micro-Dev</a> · free tool · <a href="./">hub</a> · <a href="base64-url.html">Base64/URL</a> · <a href="csv-json.html">CSV↔JSON</a> · <a href="html-to-json.html">HTML→JSON</a></p>
<div class="hero">
<span class="badge">FREE · browser-only · query ↔ JSON</span>
<h1>Query String ↔ JSON</h1>
<p>Paste a full URL or bare <code>?a=1&b=2</code>. Parse into JSON (multi-value arrays, nested bracket keys), edit the object, rebuild query or full URL. Form-urlencoded friendly. Nothing is uploaded. Handy next to scrape cleanup / API debugging.</p>
<p style="margin:.8rem 0 0"><img src="../assets/query-string-og.jpg" alt="Free Query String ↔ JSON converter" width="640" height="360" style="max-width:100%;height:auto;border-radius:10px;border:1px solid #334155"/></p>
<p><a class="btn green" href="mailto:acer-openclaw@agentmail.to?subject=Veriton%20order%3A%20Scrape-to-JSON%20%242">Need live URL → JSON? $2 Scrape →</a>
<a class="btn ghost" href="base64-url.html">Base64/URL →</a>
<a class="btn ghost" href="html-to-json.html">HTML→JSON →</a></p>
</div>
<div class="card">
<div class="tabs" id="tabs">
<button type="button" data-mode="parse" class="on">URL / query → JSON</button>
<button type="button" data-mode="build">JSON → query / URL</button>
</div>
<div class="row">
<button class="primary" id="run">Run</button>
<button class="secondary" id="sample">Load sample</button>
<button class="secondary" id="swap">Swap ↕</button>
<button class="secondary" id="copy">Copy output</button>
<button class="secondary" id="clear">Clear</button>
<span class="stat" id="stat">Ready</span>
</div>
<div class="opts">
<div class="opt">
<label for="multi">Duplicate keys</label>
<select id="multi">
<option value="array" selected>Collect as arrays</option>
<option value="last">Last value wins</option>
<option value="first">First value wins</option>
</select>
</div>
<div class="opt">
<label for="nested">Bracket nesting</label>
<select id="nested">
<option value="on" selected>Parse a[b][c] → nested</option>
<option value="off">Flat keys only</option>
</select>
</div>
<div class="opt">
<label for="plus">+ as space</label>
<select id="plus">
<option value="on" selected>Yes (form-urlencoded)</option>
<option value="off">No (literal +)</option>
</select>
</div>
<div class="opt">
<label for="sort">Sort keys on build</label>
<select id="sort">
<option value="off" selected>Keep insertion order</option>
<option value="on">Alphabetical</option>
</select>
</div>
<div class="opt">
<label for="base">Base URL (build mode)</label>
<input type="text" id="base" placeholder="https://example.com/path" value=""/>
</div>
</div>
<div class="err" id="err"></div>
</div>
<div class="grid">
<div class="card" style="margin:0">
<label for="inp" id="inLabel">Input (URL or query string)</label>
<textarea id="inp" spellcheck="false" placeholder="https://api.example.com/v1/search?q=open+claw&page=1&tag=agent&tag=linux&filter[status]=active"></textarea>
<p class="muted" style="margin:.45rem 0 0" id="inHint">Accepts full URLs, bare <code>?…</code>, or <code>a=1&b=2</code>. Hash fragments ignored for param parse.</p>
</div>
<div class="card" style="margin:0">
<label for="out">Output</label>
<pre id="out">{}</pre>
<div class="kv" id="meta" style="margin-top:.7rem">
<div><span class="k">Mode</span><span class="v" id="modev">parse</span></div>
<div><span class="k">Keys</span><span class="v" id="keyn">0</span></div>
<div><span class="k">Origin</span><span class="v" id="origin">—</span></div>
</div>
</div>
</div>
<div class="card">
<h2 style="margin-top:0;font-size:1.05rem">Pairs table <span class="pill" id="pairn">0</span></h2>
<div style="overflow:auto">
<table class="pairs" id="pairs">
<thead><tr><th>Key</th><th>Value</th></tr></thead>
<tbody></tbody>
</table>
</div>
<p class="muted" style="margin:.55rem 0 0">Table is read-only. Edit the JSON (build mode) or the URL (parse mode), then Run.</p>
</div>
<div class="card">
<h2 style="margin-top:0;font-size:1.05rem">Why this exists</h2>
<p class="muted" style="margin:.2rem 0">Agents and scrapers constantly juggle query bags. This stays local so you can inspect multi-value tags, nested filters, and form bodies without a network hop. Live public-URL fetch + schema remains the <strong>$2 Scrape-to-JSON</strong> SKU (CORS blocks free in-tab fetch of arbitrary hosts).</p>
</div>
<footer>
Veriton free tools · <a href="./">hub</a> · <a href="https://github.com/veriton-dev/veriton-micro-dev">source</a> · updated 2026-09-06 · Query String ↔ JSON<br/>
Nothing leaves your browser. Decode ≠ remote fetch.
</footer>
</div>
<script>
(function () {
var mode = 'parse';
var $ = function (id) { return document.getElementById(id); };
var inp = $('inp'), out = $('out'), err = $('err'), stat = $('stat');
var inLabel = $('inLabel'), inHint = $('inHint');
var modev = $('modev'), keyn = $('keyn'), originEl = $('origin'), pairn = $('pairn');
var pairsBody = $('pairs').querySelector('tbody');
var lastOrigin = '';
var lastObj = {};
function showErr(msg) {
if (!msg) { err.style.display = 'none'; err.textContent = ''; return; }
err.style.display = 'block'; err.textContent = msg;
}
function setStat(t) { stat.textContent = t; }
function setMode(m) {
mode = m;
modev.textContent = m;
document.querySelectorAll('#tabs button').forEach(function (b) {
b.classList.toggle('on', b.getAttribute('data-mode') === m);
});
if (m === 'parse') {
inLabel.textContent = 'Input (URL or query string)';
inHint.innerHTML = 'Accepts full URLs, bare <code>?…</code>, or <code>a=1&b=2</code>. Hash fragments ignored for param parse.';
} else {
inLabel.textContent = 'Input (JSON object)';
inHint.textContent = 'JSON object of params. Arrays become repeated keys. Nested objects become bracket keys when nesting is on.';
}
}
document.querySelectorAll('#tabs button').forEach(function (b) {
b.addEventListener('click', function () {
setMode(b.getAttribute('data-mode'));
showErr('');
});
});
function decodePlus(s, plusOn) {
if (!plusOn) return s;
return s.replace(/\+/g, ' ');
}
function safeDecode(s, plusOn) {
try {
return decodeURIComponent(decodePlus(s, plusOn));
} catch (e) {
try { return unescape(decodePlus(s, plusOn)); } catch (e2) { return s; }
}
}
function extractParts(raw) {
var s = String(raw || '').trim();
var origin = '';
var query = s;
if (!s) return { origin: '', query: '' };
// strip hash
var hashIdx = s.indexOf('#');
if (hashIdx >= 0) s = s.slice(0, hashIdx);
try {
if (/^https?:\/\//i.test(s) || /^\/\//.test(s)) {
var u = new URL(s, 'https://example.invalid');
origin = u.origin === 'https://example.invalid' ? '' : (u.origin + u.pathname);
// if protocol-relative, rebuild carefully
if (/^\/\//.test(String(raw || '').trim())) {
origin = u.protocol + '//' + u.host + u.pathname;
}
query = u.search ? u.search.slice(1) : '';
return { origin: origin, query: query };
}
} catch (e) { /* fall through */ }
if (s.charAt(0) === '?') query = s.slice(1);
else if (s.indexOf('=') >= 0 || s.indexOf('&') >= 0) query = s;
else if (s.indexOf('?') >= 0) {
var i = s.indexOf('?');
origin = s.slice(0, i);
query = s.slice(i + 1);
} else {
query = s;
}
return { origin: origin, query: query };
}
function setPath(obj, path, value, multi) {
if (!path.length) return;
var cur = obj;
for (var i = 0; i < path.length - 1; i++) {
var p = path[i];
var next = path[i + 1];
var wantArr = next === '' || /^\d+$/.test(next);
if (cur[p] == null || typeof cur[p] !== 'object') {
cur[p] = wantArr ? [] : {};
}
cur = cur[p];
}
var last = path[path.length - 1];
if (last === '') {
// a[] = push
if (!Array.isArray(cur)) { /* shouldn't */ return; }
cur.push(value);
return;
}
if (Object.prototype.hasOwnProperty.call(cur, last)) {
if (multi === 'array') {
if (!Array.isArray(cur[last])) cur[last] = [cur[last]];
cur[last].push(value);
} else if (multi === 'first') {
/* keep */
} else {
cur[last] = value;
}
} else {
cur[last] = value;
}
}
function parseKeyPath(key, nestedOn) {
if (!nestedOn) return [key];
// foo[bar][0][baz] or foo[]
var m = key.match(/^([^\[\]]+)(.*)$/);
if (!m) return [key];
var path = [m[1]];
var rest = m[2] || '';
var re = /\[([^\[\]]*)\]/g;
var mm;
while ((mm = re.exec(rest))) {
path.push(mm[1]);
}
if (path.length === 1 && rest && rest.indexOf('[') >= 0) {
// malformed brackets — flat
return [key];
}
return path;
}
function parseQuery(query, opts) {
var obj = {};
var flatPairs = [];
if (!query) return { obj: obj, pairs: flatPairs };
var parts = query.split('&');
for (var i = 0; i < parts.length; i++) {
var part = parts[i];
if (!part) continue;
var eq = part.indexOf('=');
var rawK = eq >= 0 ? part.slice(0, eq) : part;
var rawV = eq >= 0 ? part.slice(eq + 1) : '';
var k = safeDecode(rawK, opts.plus);
var v = safeDecode(rawV, opts.plus);
flatPairs.push({ key: k, value: v });
if (opts.nested) {
var path = parseKeyPath(k, true);
setPath(obj, path, v, opts.multi);
} else {
if (Object.prototype.hasOwnProperty.call(obj, k)) {
if (opts.multi === 'array') {
if (!Array.isArray(obj[k])) obj[k] = [obj[k]];
obj[k].push(v);
} else if (opts.multi === 'first') {
/* keep */
} else {
obj[k] = v;
}
} else {
obj[k] = v;
}
}
}
return { obj: obj, pairs: flatPairs };
}
function encodeComp(s) {
return encodeURIComponent(s == null ? '' : String(s)).replace(/%20/g, '+');
}
function flattenValue(key, val, out) {
if (val === null || val === undefined) {
out.push([key, '']);
return;
}
if (Array.isArray(val)) {
if (!val.length) {
out.push([key + '[]', '']);
return;
}
for (var i = 0; i < val.length; i++) {
var item = val[i];
if (item !== null && typeof item === 'object') {
if (Array.isArray(item)) flattenValue(key + '[' + i + ']', item, out);
else {
var ikeys = Object.keys(item);
for (var j = 0; j < ikeys.length; j++) {
flattenValue(key + '[' + i + '][' + ikeys[j] + ']', item[ikeys[j]], out);
}
}
} else {
out.push([key, item == null ? '' : String(item)]);
}
}
return;
}
if (typeof val === 'object') {
var keys = Object.keys(val);
if (!keys.length) {
out.push([key, '']);
return;
}
for (var k = 0; k < keys.length; k++) {
flattenValue(key + '[' + keys[k] + ']', val[keys[k]], out);
}
return;
}
out.push([key, String(val)]);
}
function flattenRoot(obj) {
if (obj == null || typeof obj !== 'object' || Array.isArray(obj)) {
throw new Error('JSON root must be a plain object of params');
}
var out = [];
var keys = Object.keys(obj);
for (var i = 0; i < keys.length; i++) flattenValue(keys[i], obj[keys[i]], out);
return out;
}
function buildQuery(obj, opts) {
var pairs = flattenRoot(obj);
if (opts.sort) {
pairs = pairs.slice().sort(function (a, b) {
if (a[0] < b[0]) return -1;
if (a[0] > b[0]) return 1;
return 0;
});
}
return pairs.map(function (p) {
return encodeComp(p[0]) + '=' + encodeComp(p[1]);
}).join('&');
}
function countKeys(o) {
try { return Object.keys(o || {}).length; } catch (e) { return 0; }
}
function renderPairs(pairs) {
pairsBody.innerHTML = '';
pairn.textContent = String(pairs.length);
for (var i = 0; i < pairs.length; i++) {
var tr = document.createElement('tr');
var tdK = document.createElement('td'); tdK.className = 'k'; tdK.textContent = pairs[i].key;
var tdV = document.createElement('td'); tdV.className = 'v'; tdV.textContent = pairs[i].value;
tr.appendChild(tdK); tr.appendChild(tdV);
pairsBody.appendChild(tr);
}
}
function opts() {
return {
multi: $('multi').value,
nested: $('nested').value === 'on',
plus: $('plus').value === 'on',
sort: $('sort').value === 'on'
};
}
function run() {
showErr('');
try {
var o = opts();
if (mode === 'parse') {
var parts = extractParts(inp.value);
lastOrigin = parts.origin || '';
var parsed = parseQuery(parts.query, o);
lastObj = parsed.obj;
out.textContent = JSON.stringify(lastObj, null, 2);
keyn.textContent = String(countKeys(lastObj));
originEl.textContent = lastOrigin || '—';
renderPairs(parsed.pairs);
setStat(parsed.pairs.length + ' pair(s) · ' + countKeys(lastObj) + ' top key(s)');
} else {
var raw = inp.value.trim();
if (!raw) throw new Error('Paste a JSON object');
var obj = JSON.parse(raw);
lastObj = obj;
var q = buildQuery(obj, o);
var base = ($('base').value || '').trim() || lastOrigin || '';
var built;
if (base) {
// attach query
if (base.indexOf('?') >= 0) base = base.replace(/\?.*$/, '');
built = base + (q ? ('?' + q) : '');
} else {
built = q ? ('?' + q) : '';
}
out.textContent = built;
keyn.textContent = String(countKeys(obj));
originEl.textContent = base || '—';
// pairs from rebuild
var flat = flattenRoot(obj).map(function (p) { return { key: p[0], value: p[1] }; });
renderPairs(flat);
setStat(flat.length + ' pair(s) built');
}
} catch (e) {
showErr(e.message || String(e));
setStat('Error');
}
}
$('run').addEventListener('click', run);
$('clear').addEventListener('click', function () {
inp.value = ''; out.textContent = '{}'; showErr(''); setStat('Cleared');
renderPairs([]); keyn.textContent = '0'; originEl.textContent = '—';
});
$('copy').addEventListener('click', function () {
var t = out.textContent || '';
if (navigator.clipboard && navigator.clipboard.writeText) {
navigator.clipboard.writeText(t).then(function () { setStat('Copied'); }).catch(function () { setStat('Copy failed'); });
} else {
var ta = document.createElement('textarea'); ta.value = t; document.body.appendChild(ta); ta.select();
try { document.execCommand('copy'); setStat('Copied'); } catch (e) { setStat('Copy failed'); }
document.body.removeChild(ta);
}
});
$('swap').addEventListener('click', function () {
var a = inp.value; inp.value = out.textContent; out.textContent = a;
setMode(mode === 'parse' ? 'build' : 'parse');
setStat('Swapped · switched to ' + mode);
});
$('sample').addEventListener('click', function () {
if (mode === 'parse') {
inp.value = 'https://api.example.com/v1/search?q=open+claw&page=1&tag=agent&tag=linux&filter[status]=active&filter[region][]=us&filter[region][]=eu';
} else {
inp.value = JSON.stringify({
q: 'open claw',
page: '1',
tag: ['agent', 'linux'],
filter: { status: 'active', region: ['us', 'eu'] }
}, null, 2);
$('base').value = 'https://api.example.com/v1/search';
}
run();
});
// Ctrl/Cmd-Enter
inp.addEventListener('keydown', function (e) {
if ((e.metaKey || e.ctrlKey) && e.key === 'Enter') run();
});
setMode('parse');
})();
</script>
</body>
</html>