SprintKit
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100% Client-side & Private Sandbox

JSON Formatter, Validator & Tree Inspector

Data & Formatting

Prettify, minify, validate, and interactively inspect JSON data structures with real-time node tree exploration.

View Mode:
Indentation:
Input JSON
Paste raw JSON25 lines · 407 chars
Interactive Tree InspectorObject (5)
{5 keys
"project":"SprintKit",
"version":"1.0.0",
"sprint":{4 keys
"id":42,
"goal":"Ship dev-tools expansion",
"points":28,
"completed":true
},
"team":[2 items
[0]:{... }2 keys
[1]:{... }2 keys
],
"settings":{3 keys
"theme":"dark",
"offlineMode":true,
"analytics":false
}
}
Guide & Documentation

Fast, Private JSON Formatter, Validator & Tree View Studio

Format, validate, and explore JSON in an interactive tree view. Parsing and formatting run in your browser, and the tool does not send your input over the network.

How to Format & Inspect JSON in SprintKit

01

Paste your JSON

Paste a minified string, an API response, or a configuration file into the input editor.

02

Format or minify

Choose 2 spaces, 4 spaces, or tabs and click Format In Place, or click Minify. If the JSON is invalid, the parser error appears below the input.

03

Explore in the tree view

Search keys and values, expand or collapse nodes, and copy the JSON path or the value of any node.

Key Features of SprintKit JSON Studio

Runs in your browser

Parsing, formatting, and tree rendering happen locally. The JSON tool makes no network requests for your input.

Interactive tree view

Expand and collapse nested objects and arrays, search keys or values with highlighted matches, and copy paths such as items[0].id.

Minify and pretty-print

Switch between compact single-line JSON for payloads and 2-space, 4-space, or tab indentation for reading.

Sort keys

Optionally sort object keys alphabetically in the formatted output.

JSON Formatting & Security Tips

  • §1Do not paste real personal data, production credentials, or unhashed passwords into any online formatter. This tool keeps processing local, but redact sensitive values before you share or store a payload.
  • §2Minify payloads before sending them over slow networks or storing them in database JSON columns to reduce byte size.
  • §3Check that API responses are valid JSON (RFC 8259) before changing backend contracts. This tool checks JSON syntax, not your API schema.

Frequently Asked Questions

Is my JSON stored or sent to a server?
No. Parsing and formatting run in your browser, and the JSON tool does not send your input over the network.
Does it repair invalid JSON?
No. The tool shows the parser error. It does not automatically fix trailing commas, missing quotes, or unmatched brackets, so correct the reported position in the input.
Does it support comments (JSONC) or JSON5?
No. The input must be standard JSON. Remove comments and other extensions before you paste.
Can I work with large documents?
The tree view renders every expanded node, so very large documents can be slow to display. Collapse the sections you do not need, or use the Raw Code view for large payloads.

Related Agile & Developer Tools

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Diff Checker

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