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Browse tools →A calm, browser-side JSON helper for formatting, inspecting, and navigating JSON payloads — ideal for debugging APIs, logs, and config files without copying data into external services.
The JSON Formatter & Viewer focuses on three things:
Everything runs in your browser — nothing is uploaded or logged — so you can safely paste production payloads and internal data.
The tool trims the input first. Empty or whitespace-only input is treated as “no data” rather than an error. Real JSON is parsed using JSON.parse wrapped in a diagnostic layer that produces more helpful error messages and approximate line/column information.
Successful parses are re-serialized with consistent indentation (typically 2 spaces). This makes payloads easy to scan and compare, regardless of how the backend originally formatted them.
In tree mode, objects and arrays are rendered as nested nodes with expand/collapse controls. Large branches are collapsed by default so you can focus only on the parts you care about.
Issue | Likely cause | What to try |
|---|---|---|
| Parse error on valid-looking JSON | Hidden characters, trailing commas, or comments. | Check the highlighted position and remove comments, dangling commas, or stray characters. |
| Tool feels slow on huge payloads | Rendering a very large tree in the browser. | Use text formatting only, or trim unnecessary fields before pasting. |
| Numbers or dates show up as strings | They were serialized as strings by the backend. | This is normal JSON behavior; update the backend if you need typed values instead. |