Question 1

What's the difference between a JSON formatter and a JSON validator?

Accepted Answer

A formatter rewrites JSON with indentation so a human can read it; a validator checks whether the JSON parses against the spec, or against a schema, if one is supplied. Most browser tools combine both. json-formatter-validator pretty-prints and flags syntax errors in the same pass; validate-json is the lighter pass/fail version when readability isn't the goal.

Question 2

How do I convert a CSV with a custom delimiter to JSON?

Accepted Answer

First, normalize the delimiter. change-csv-delimiter swaps semicolons or pipes for commas. Then run csv-to-json on the cleaned file. If the source uses tabs, convert-tsv-to-json skips the middle step. For inconsistent rows where some columns are missing, fill-incomplete-csv-records pads them first so the JSON output stays uniform.

Question 3

Is YAML or JSON better for config files?

Accepted Answer

YAML wins on readability when humans edit the file, comments are allowed, quotes are optional, and indentation maps to nesting. JSON wins on parser speed and tooling, every language ships a JSON parser, while many still need a third-party YAML library. Kubernetes, GitHub Actions, and Ansible chose YAML; most public APIs chose JSON. Convert with yaml-to-json when a YAML file needs to feed a JSON-only consumer.

Question 4

How do I diff two JSON files without losing track of array order?

Accepted Answer

json-diff compares two JSON documents key-by-key and highlights added, removed, and changed fields. By default it treats array order as significant, [1, 2] and [2, 1] count as different. For order-independent comparison, sort both arrays first with json-sorter, then diff the canonical versions.

Question 5

Can I generate a TypeScript interface from a JSON API response?

Accepted Answer

Yes, paste a sample response into json-to-typescript and it writes a matching interface. Optional fields and union types come from inferring across multiple samples; for richer typing, generate a JSON Schema with json-schema-generator first, then run a Schema-to-TypeScript converter. The same approach feeds json-to-java-pojo for Spring services.

Question 6

Why is my JSON file failing to parse?

Accepted Answer

The five most common reasons: a trailing comma after the last array or object element (illegal in JSON, legal in JS), single quotes instead of double quotes, unescaped backslashes inside strings, comments (the JSON spec doesn't allow them), and unquoted keys. json-formatter-validator names the line and column on each error. If the file is JSON5 or JSONC, strip the comments before validating.

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