{} JSON Diff Viewer

Compare two JSON documents and see added, removed, and changed keys highlighted. Supports deep nested structures. Free online JSON diff tool — runs in browser, no uploads.

JSON A (Original)

JSON B (Modified)

How to Use

Paste two JSON objects

Enter your original JSON in the left panel and the modified JSON in the right panel.

Click Compare

Press the Compare button to run the diff. The tool parses and validates both inputs first.

Read the color-coded diff

Green = added, Red = removed, Yellow = changed value, Grey = unchanged. Expand nested objects with the arrows.

Frequently Asked Questions

How does JSON diff work? +

The tool parses both JSON inputs and recursively compares their keys and values. Added keys (only in the right JSON) are highlighted green. Removed keys (only in the left) are red. Changed values (same key, different value) are yellow. Unchanged keys are shown in grey.

Does it handle nested objects and arrays? +

Yes — the diff is fully recursive. Nested objects are compared key by key, and arrays are compared element by element by index. Structural differences at any depth are highlighted.

What happens if one JSON is invalid? +

If either input is not valid JSON, the tool shows a parse error with the location of the problem before attempting any comparison.

Can I use this to compare API responses? +

Yes — paste two API responses (from different environments, versions, or time points) and immediately see what changed. This is a common use case for debugging regression changes in API contracts.

Is my data sent to a server? +

No. All parsing and comparison runs entirely in your browser using JavaScript. Your JSON data never leaves your device.

Guía: Comparador de JSON

¿Qué es?

Compara dos objetos JSON y resalta diferencias estructurales: claves añadidas (verde), eliminadas (rojo), modificadas (amarillo). Más inteligente que un diff de texto — entiende la estructura JSON.

Cómo usar

Pega el primer JSON en el panel izquierdo.
Pega el segundo JSON en el panel derecho.
Navega por las diferencias usando los controles.

Consejos

Formatea ambos JSON antes de comparar para eliminar diferencias de espaciado.
En arrays, el orden importa para el diff.
Diferencias como 1 vs 1.0 pueden ser irrelevantes en tu contexto.