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Guides

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 — RFC 6901 and RFC 6902 Explained
JSON Pointer is a standardized path syntax. JSON Patch is a standardized diff format. Both are tiny, both are universally supported, and both save you from reinventing them.
April 17, 2026

Schema & Validation

JSON Schema Essentials — Validation, Types, and Common Patterns
A practical guide to JSON Schema Draft 7, 2019-09 and 2020-12: types, keywords, $ref, conditional validation, and the patterns that ship in production APIs.
April 17, 2026

Formats & Conversion

JSON vs YAML vs TOML — A Practical Decision Framework
Stop arguing about config formats. A practical framework for choosing between JSON, YAML, and TOML based on who reads it, who writes it, and what tooling you have.
April 17, 2026

Security

JSON Security Pitfalls — Prototype Pollution, DoS, and Parsing Attacks
Every JSON input is attacker-controlled until proven otherwise. Prototype pollution, parser DoS, deep nesting — the attacks that actually ship against JSON endpoints.
April 17, 2026
JWT Best Practices in 2026 — What to Use, What to Avoid
Modern JWT guidance: EdDSA over RS256, mandatory alg pinning, revocation strategies, and the footguns that keep shipping in production auth code.
April 17, 2026

Performance

JSON Compression Strategies — gzip, MessagePack, CBOR, and When Each Wins
JSON is text and it compresses beautifully. But sometimes you want a binary format instead. Here is when gzip is enough and when MessagePack or CBOR earns its keep.
April 17, 2026
Streaming JSON Parsers — Handling Arrays of a Million Records
You cannot JSON.parse a 5 GB file. Streaming JSON parsers process arrays one record at a time. Here is how oboe.js, stream-json, and ijson work in practice.
April 17, 2026

Ecosystem

JSONPath vs JMESPath vs jq — When to Use Each
Three JSON query languages, three different sweet spots. A practical comparison of JSONPath, JMESPath, and jq with real queries and when to reach for each.
April 17, 2026

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