Input JSON
Expanded Tree
Arrays & objects auto-expanded
Paste JSON and read it in an auto-expanded tree — arrays and objects opened for you, always formatted, validated as it renders. Fast, secure, and entirely in your browser.
No installation, no signup. Results in milliseconds.
A JSON reader opens JSON and presents it in a clean, expanded tree so you can read through the data quickly — keys, values, arrays, and nested objects laid out clearly. This reader keeps everything expanded and always shows a formatted view.
A reader favours an always-open, top-to-bottom read; a viewer adds collapsible nodes and search for exploring very large structures. Both validate as they render.
JSONFormatterPro has several ways to look at JSON. They overlap, so here is which tool fits which job.
| Tool | Best when you want to… | Output |
|---|---|---|
| Reader (this tool) | Read data top to bottom, everything already open | Auto-expanded, formatted tree |
| Viewer | Explore a large payload branch by branch | Collapsible interactive tree |
| Parser | Validate and switch between tree / pretty / minified | Three views + error reporting |
| Formatter | Beautify with a chosen indent and convert | Pretty-printed JSON |
Because everything runs locally in your browser, performance scales with your own device rather than a shared server — there are no upload limits and nothing is queued. For very large payloads where scrolling a fully expanded tree becomes unwieldy, switch to the collapsible JSON Viewer, which lets you open only the branches you need.
The reader always presents a formatted, validated view: object keys, string, number, boolean and null values are each styled distinctly, and arrays display their items with their index. If the JSON is malformed, it shows the parser’s error message instead of a tree so you can fix the data first. To grab a clean copy, use Copy or Download; to reformat with a specific indent, hand it to the Pretty Print tool.
See how the reader turns a compact one-liner into something you can scan in seconds.
Paste a one-line, minified blob like the input above and the reader validates it and renders an always-expanded, formatted view. There is no button to hunt for and no branches to open — every key and value is visible top to bottom, exactly what you want when you just need to read the data rather than explore it.
The keys, values, and structure are untouched; only whitespace is added for readability. Once it is readable, use Copy to grab a formatted copy, or send it to the JSON parser to validate it or the JSON formatter to reformat and convert it.
Reading JSON is the fastest way to understand unfamiliar data.
Everything developers ask about reading JSON.
.json file first, see how to open a JSON file.Hands-on articles from our blog.
All free, all browser-based, no signup required.