JSON Viewer Online
JSON viewer online
View JSON online from APIs, configs, and test data
A JSON viewer online helps when raw JSON is too dense to read in one line. Paste an API response, a local config file, a static data export, or the output from a converter, then turn it into readable formatted JSON and a navigable tree.
The page focuses on the first inspection step: can the JSON parse, what shape does it have, and where are the keys or values you need? It does not change your data model or apply schema rules.
Paste or upload JSON
Start from copied JSON, a local .json file, or the sample data built into the tool.
Validate and switch views
Check the parser status, then use formatted text, minified output, or the tree view depending on the task.
Copy or download JSON
Save the readable or compact output for documentation, test fixtures, support notes, or quick debugging.
Format JSON online and inspect the tree
JSON formatters and JSON tree viewers solve different parts of the same problem. Formatted text makes the document readable line by line. Tree view helps you follow nesting, arrays, object keys, and value types without scrolling through every bracket.
Use it for JSON formatter online tasks when the next question is still inspection: does the payload parse, what does the root contain, and which nested value needs attention? Use a schema-aware JSON validator online only when required fields and business rules matter.
Readable formatting
Pretty-print JSON with two-space indentation so objects, arrays, and nested fields become easier to review.
Compact minify view
Switch to minified JSON when you need a compact version for a field, fixture, or quick local file.
Tree search
Search visible keys, values, or types in the tree when a payload has repeated records or nested settings.
JSON input example
{
"project": "Online Viewer Tools",
"tools": [
{
"name": "JSON Viewer Online",
"features": ["format", "tree", "minify"]
}
]
}Tree view output
$ object
project string "Online Viewer Tools"
tools array [1]
0 object {2}
What this JSON viewer checks
The viewer checks whether the input can be parsed as JSON, then shows object count, array count, key count, primitive values, byte size, and nesting depth. Those facts help you decide whether you are looking at a small config object, a list of records, or a deeply nested payload.
What belongs in another tool
Use another workflow for JSON repair, JSON Schema validation, JSONPath extraction, diffing two documents, JSONL or NDJSON streams, data conversion, or very large files that need streaming or worker-based parsing.
Check JSON before you use it elsewhere
Valid JSON is only the first gate. Before you paste the output into code, a CMS, a mock API, or a config file, check that the root shape, field names, value types, and nesting depth match the destination.
Watch exact numeric data carefully. JavaScript JSON parsing represents numbers as JavaScript numbers, so very large integers may not be safe for account IDs, balances, or values where every digit must be preserved.
Root shape
Check whether the root is an object, an array, or a primitive value before passing JSON to another system.
Field names
Confirm important keys are spelled correctly and nested under the expected parent object.
Value types
Look for strings, numbers, booleans, nulls, arrays, and objects where the destination expects them.
Sensitive data
Remove secrets, tokens, customer records, or regulated data before pasting JSON into any browser tool.