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JSONCraft

Guides

JSON ecosystem guides

Practical, technical guides on JSON Schema, JWT, JSONPath vs JMESPath, JSON vs YAML vs TOML, streaming parsers, security pitfalls, and compression. Each guide pairs with the JSONCraft tool that applies it in-browser.

Fundamentals

JSON Pointer and JSON Patch — Worked Example
Copy a JSON Pointer path and understand all six JSON Patch operations with a starting document and a reproducible result.
April 17, 2026

Schema & Validation

JSON Schema: validate a small subscription contract
Try a complete 2020-12 schema with valid and invalid inputs, conditional requirements and an explicit policy for extra fields.
April 17, 2026

Formats & Conversion

JSON, YAML and TOML: compare the same configuration
Convert one configuration across three formats, verify its structure and identify null, date, number and comment losses.
April 17, 2026

Security

JSON input security: validate shape, bound work and preserve numbers
A runnable allowlist example shows why parsing, validation and safe state updates are separate tasks.
April 17, 2026
JWT validation: a runnable example and failure checks
Verify a synthetic token with a named library, reject the wrong audience and expiry, and distinguish decoding from authentication.
April 17, 2026

Performance

JSON compression: measure gzip and Brotli on your data
Run a downloadable Node benchmark, compare UTF-8 byte sizes and decode time, and decide whether a binary format is worth testing.
April 17, 2026
Process large JSON: a runnable NDJSON filter
Filter records without loading an entire export, reproduce the result, and understand where streaming still needs memory and error controls.
April 17, 2026

Ecosystem

JSONPath, JMESPath and jq: one input, checked results
Run equivalent selections on a downloadable JSON sample, compare result shapes and choose a language supported by your tool.
April 17, 2026

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