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.
Content reviewed October 2026 · About Toolzum
Inspect JSON API payloads for structure, size breakdown, and key depth — spot sensitive fields before sharing logs before production incidents.
Analyze HAR network captures — waterfall timing, payload sizes, failed requests. Find the 3-second render blocker in minutes — local parsing, free, no signup.
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Profile CSV datasets — row counts, column types, null rates, value distributions. Scope data quality before analysis — local parsing, free, no signup.
Read any PDF's metadata instantly — page count, size, author, creation date, encryption status. Verify a download before opening fully — local parsing, free, no signup.
Usually one branch: base64 images, verbose timestamps, or unpaginated arrays. The analyzer ranks branches by bytes so the culprit surfaces first.
Over 100 KB slows mobile parses; over 1 MB needs pagination or trimming. Aim responses under 50 KB for snappy apps.
Beyond 5–6 levels, client code and debugging suffer more than bytes suggest. Flatten deep structures where the domain allows.
No — analysis runs locally in your browser. Payloads never leave your device.
API Payload Analyzer
Inspect JSON API payloads for structure, size breakdown, and key depth — spot sensitive fields before sharing logs before production incidents.
JSON Formatter
Pretty-prints raw JSON with configurable indent width, key sorting, and bracket collapsing options while flagging syntax errors with exact.