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Kafka Header Inspector
Decode ordered Kafka header key/Base64 pairs, preserving duplicates, nulls and non-UTF-8 bytes.
Kafka headers JSON
kafka-header-inspector.json (complete report and generated source where applicable)
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Enter values using the displayed examples; observe the documented input shape and limits.
- Choose Calculate result. Review the complete JSON report and any generated source text it contains.
- Download result to save the complete report; copy the generated source member into your project when relevant. Reset restores examples and clears output.
Examples
Kafka headers JSON: [{"key":"trace","valueBase64":"aGk="},{"key":"trace","valueBase64":null}]
Limitations
- JSON array of {key,valueBase64}; up to 2,000 entries. No broker access. Values may contain private data and appear in local downloaded output.
- Maximum 100,000 UTF-16 units per field, 400,000 UTF-8 combined input bytes, 4 MiB output and 30 seconds in a local worker. Tool-specific bounds may be tighter.
- Generated snippets are source text inside the JSON download. They are never executed by this tool. Local inspection does not verify remote systems or establish standards certification.
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