README.md

json-viewer

This is a json-viewer custom element (a.k.a. web-component). Nothing fancy, just a copy of devtools json viewer you see in network panel when previewing json response.

Here’s a demo.

Usage

HTML

Load as module, and use

<script type="module" src="https://unpkg.com/@_1602/json-viewer"></script>
<json-viewer value='{"foo": "bar"}'></json-viewer>

Customize appearance in CSS

json-viewer {
  --jv-background-color: #fff;
  --jv-color: rgb(31, 31, 31);
  --jv-font-size: 11px;
  --jv-font-family: monospace;
  --jv-font-weight: 400;
  --jv-expand-bullet-color: black;
  --jv-expand-bullet-width: 14px;
  --jv-expand-bullet-height: 14px;
  --jv-key-color: rgb(142, 0, 75);
  --jv-number-value-color: rgb(8, 66, 160);
  --jv-bool-value-color: rgb(8, 66, 160);
  --jv-null-value-color: rgba(31, 31, 31, 0.38);
  --jv-string-value-color: rgb(220, 54, 46);
  --jv-focused-node-background: #eee;
  --jv-hovered-node-background: #eee;
}

To change toggle icon (‣):

json-viewer {
  --expand-bullet-mask-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" fill="none"><path d="M10.5 6.65 4.9 2.8v7.7" fill="black"/></svg>');
}

React+TS

To use it in react create declarations.d.ts with

declare namespace JSX {
  interface IntrinsicElements {
    'json-viewer': any;
  }
}

And then use as like this

export function JsonViewer({ value }: { value: string }) {
  return <json-viewer value={value}></json-viewer>;
}

Vue+Vite

In vite config, add to vue() plugin

export default defineConfig({
  // ...
  plugins: [
    vue({
      template: {
        compilerOptions: {
          isCustomElement: (tag) => ['json-viewer', ...].includes(tag),
        },
      },
    }),
  ],
  // ...
});