Blog & JSON Tutorials
Complete guides, hands-on tutorials, and JSON documentation for developers from beginner to advanced.
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The most comprehensive JSON guides and tutorials
What is JSON? A Complete Beginner's Guide
JSON (JavaScript Object Notation) is the lightweight data-interchange format behind nearly every API, config file, and NoSQL database. Learn the syntax, the six data types, how parsing behaves in code, and the mistakes everyone makes hand-writing it.
The History of JSON: From 2000 to Industry Standard
Trace JSON from Douglas Crockford's idea in 2001, through Yahoo's adoption, to becoming the ECMA-404 standard that powers 90% of modern APIs.
The Complete JSON Schema Guide (Draft 7)
JSON Schema is the standard for describing and validating JSON structure. Learn the core keywords, build a real API schema, compose and reuse schemas with $ref, and run validation in code with Ajv.
JSON Examples in 7 Languages (With Code)
Production-ready JSON parsing and serialization examples across seven languages — with error handling and best practices.
Every JSONForge Tool, Explained
A tour of all the JSON tools in the toolkit — what each one does, when to reach for it, and how they fit together. Format, validate, repair, convert, and explore JSON, all in your browser.
The JSONForge Browser Extension
Format, validate, and explore JSON on any web page without leaving your tab. A guide to what the JSONForge browser extension does, how to install it, and when it beats the website.
JSON vs XML vs YAML: Choosing the Right Data Format
JSON, XML, and YAML all represent the same structured data in different shapes, with different trade-offs around verbosity, comments, and parsing. A practical comparison of when each one actually wins.
Common JSON Parsing Errors and How to Fix Them
JSON.parse() is unforgiving — one stray comma or unescaped character anywhere in the document throws the whole thing out. A field guide to the most common JSON parsing errors, what V8's error messages actually mean, and when to fix by hand vs. reach for a repair tool.
REST API JSON Design: Best Practices
The JSON shape of a REST API is a contract every client depends on. A practical guide to envelope design, pagination, null vs. omitted fields, error shapes, naming conventions, and the anti-patterns that make APIs painful to consume.
Working with Nested JSON: Flattening, Querying, and Transforming Data
Deeply nested JSON is natural for programs and painful for spreadsheets and SQL. A practical guide to flattening nested objects into flat key/value maps, deciding when to flatten vs. keep nesting, and querying nested values with dot-path notation.
JSON Minification vs. Prettification: When to Use Each
Minified JSON saves bytes; prettified JSON saves your eyes. A practical guide to when whitespace matters, when it doesn't, and how much you actually save by stripping it.
Generating TypeScript Types from JSON: A Practical Guide
Stop hand-writing interfaces for API responses. Learn how JSON-to-TypeScript inference works, where it gets ambiguous (optional fields, unions, dates), and how to review generated types before trusting them.
How to Diff and Compare JSON Documents
A line-by-line text diff on JSON is nearly useless — reordering two keys looks like a rewrite. Here's how structural JSON diffing actually works, and where it's used: API regression testing, config drift, and audit trails.
JSON Security: Common Vulnerabilities and How to Avoid Them
JSON.parse() is safe, but what you do with the result often isn't. A look at prototype pollution, unsafe merges, and why validating untrusted JSON against a schema before trusting it matters.
JSONPath and Querying JSON: Finding Data Deep in Large Documents
JSONPath is a small query language for reaching into nested JSON with a path expression instead of hand-written traversal code. Learn the core syntax, filters, wildcards — and when to reach for jq or plain code instead.
JSON Serialization Performance: Parsing, Streaming, and Large Documents
Parsing JSON is free until a 200 MB export blocks the event loop or a log pipeline falls behind. Where parse cost actually goes, DOM vs streaming parsers, memory blowup, NDJSON, and when binary formats are worth it.
Designing JSON Webhook Payloads That Don't Break Consumers
A webhook is an API you can never safely change — hundreds of consumers depend on the shape you shipped on day one. Event envelopes, versioning, idempotency, signatures, and schema discipline.
JSON and GraphQL: How Queries Map to JSON Responses
GraphQL isn't a replacement for JSON — it's a query layer on top of it. How the data/errors/extensions envelope works, why responses mirror query shape, and what variables, aliases, and fragments do to your JSON.
JSON Config Files Done Right: Environments, Validation, and the Comments Problem
Config changes more often than code and is tested less. A practical playbook for JSON configuration: base-plus-environment layering, the comments problem, JSON Schema validation in CI, secrets, and real tsconfig patterns.
Pagination Patterns for JSON APIs: Offset, Cursor, and Keyset
Offset pagination skips rows under inserts and gets slower with every page. Offset, cursor, and keyset pagination compared — envelopes, opaque page tokens, consistency, and Link headers versus response bodies.