Inspect JSON API payloads for structure, size breakdown, and key depth — spot sensitive fields before sharing logs before production incidents. Code never leaves your device — formatting and validation run locally in your browser.
Content reviewed October 2026 · About Toolzum
Profile JSON payload weight — byte size, key counts, nesting depth, and heavy branches. Find the 2 MB field bloating responses — local analysis, free, no signup.
Decode Base64 strings and pretty-print JSON data — paste encoded text to see the decoded result instantly. Inspect API payloads and tokens readably — free, local, no signup.
Prettify raw JSON and XML API responses with indentation, key sorting, and syntax validation. Read nested payloads at a glance — local processing, free, no signup.
Bidirectional YAML to JSON and JSON to YAML conversion with auto-format detection and real-time preview. Perfect for configuration files, API payloads, and data migration.
Analyze CSV structure — column types, counts, unique values, and empty cells. Spot malformed rows and mixed types before import.
JSON payload structure, size breakdown, key depth, and type distribution.
Analyzes in chunks — multi-megabyte bodies won't freeze the tab.
Keys named like token, secret, or password surface for review before you share logs.
No — analysis runs locally in your browser, free with no signup.
JSON Formatter
Pretty-prints raw JSON with configurable indent width, key sorting, and bracket collapsing options while flagging syntax errors with exact.
JSON Size Analyzer
Profile JSON payload weight — byte size, key counts, nesting depth, and heavy branches. Find the 2 MB field bloating responses — local analysis, free, no signup.