JSON objects
Objects store named members inside braces. The tree viewer counts object keys and keeps nested values grouped under their parent node.
Developer utility
JSON Parser and Tree Viewer
Validate JSON, format payloads, inspect syntax errors, and explore nested data in a compact tree without uploading content.
- Runtime
- Browser
- Parser
- Native
- Views
- Tree
Parser workspace
Input is parsed with the browser JSON API.
0 chars
0 chars
Waiting for JSON input.
Tree viewer
Validated JSON is rendered as collapsible nodes.
Enter valid JSON to generate a tree.
JSON arrays
Arrays preserve ordered values inside brackets. Numeric indexes appear as labels so nested arrays are easier to scan.
Strict syntax
JSON requires quoted property names, valid commas, and supported scalar values. The error lens highlights the reported parser position.
Usage guide
How to use the JSON parser
What this tool shows
It validates JSON, formats or minifies valid input, estimates the syntax error location, and renders nested values as a collapsible tree.
How to test it
Paste an API response, press Format, collapse deep objects, then intentionally remove a comma or quote to see the error lens react.
When it helps
Use it when reviewing API payloads, checking configuration files, cleaning copied logs, or finding where malformed JSON breaks a parser.