JSON INSPECTOR
Small helpers for validating, formatting, minifying and measuring JSON in the browser.
USE TERMS
MIT licensed. If you copy or adapt this code, keep the included copyright and permission notice with it.
CODE
Standalone source for this tool. Copy it directly or adapt it under the stated license.
JAVASCRIPT
/*
MIT License
Copyright (c) 2026 BinaryAcid
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
function inspectJson(source) {
const parsed = JSON.parse(source);
let keys = 0;
let values = 0;
let depth = 0;
function walk(node, level) {
depth = Math.max(depth, level);
if (Array.isArray(node)) {
node.forEach(function (item) { walk(item, level + 1); });
return;
}
if (node !== null && typeof node === 'object') {
Object.keys(node).forEach(function (key) {
keys += 1;
walk(node[key], level + 1);
});
return;
}
values += 1;
}
walk(parsed, 0);
return {
parsed: parsed,
type: Array.isArray(parsed) ? 'ARRAY' : parsed === null ? 'NULL' : typeof parsed === 'object' ? 'OBJECT' : typeof parsed,
keys: keys,
values: values,
depth: depth,
bytes: new TextEncoder().encode(source).length
};
}
function formatJson(source) {
return JSON.stringify(JSON.parse(source), null, 2);
}
function minifyJson(source) {
return JSON.stringify(JSON.parse(source));
}