JSON Guides & Tutorials
Practical guides for working with JSON — from understanding the syntax rules to fixing parse errors and validating JSON in JavaScript code.
BeginnerValidation
How to Validate JSON
What makes JSON valid, how to use an online validator, and a step-by-step walkthrough of the validation process.
TroubleshootingErrors
How to Fix Invalid JSON
Solutions for every common JSON error — single quotes, trailing commas, unquoted keys, comments, and more. Includes before/after examples.
ReferenceSyntax
JSON Syntax Rules – Complete Reference
The full RFC 8259 rule set: data types, string escaping, number formats, object and array structure, and whitespace rules.
JavaScriptCode
How to Validate JSON in JavaScript
Code examples for validating JSON using JSON.parse, try/catch, TypeScript generics, Node.js file validation, and API response handling.
TroubleshootingErrors
JSON Parse Error – Reference & Fixes
What every JSON parse error message means — Unexpected token, Expected double-quoted property name, Unexpected end of input, and more.
Tool GuideValidation
JSON Lint – Online JSON Linter
What JSON linting means, what a linter checks, and how to fix the 6 most common lint errors — with before/after examples.
PythonCode
How to Validate JSON in Python
json.loads, JSONDecodeError with line numbers, file validation, requests API responses, and jsonschema for structural validation.
ReferenceSchema
JSON Schema Validator – Complete Guide
What JSON Schema is, all the key validation keywords, and how to validate with Ajv (JavaScript) and jsonschema (Python).
TypeScriptCode
Validate JSON in TypeScript
Why type assertions are unsafe, how to write type guards, and how to use Zod for runtime schema validation with full TypeScript types.