JSON Tools

JSON tools read, check and reshape JSON data. This set covers the four jobs that come up most: making JSON readable, proving it is syntactically valid, comparing two versions of a document, and converting between JSON and other data formats.

Format, validate and compare

Open the Formatter when JSON is unreadable but you know it is valid. Open the Validator when something rejects your payload — it names the line and character where parsing failed. Use the Diff when you need to see what changed between two documents rather than whether they are valid.

JSON FormatterFormat, minify, and validate JSON with syntax highlighting.
JSON ValidatorValidate JSON syntax with clear, line-numbered error messages.
JSON DiffCompare two JSON documents side by side with color-coded, deep-nested diff.
XML FormatterFormat, beautify, and minify XML code with validation.

Convert between data formats

These are two-way converters. Pick by which format you are holding and which one the receiving system wants — CSV for spreadsheets, YAML for config files, TOML for Rust and Python projects, SQL for seeding a database, XML for older enterprise APIs.

JSON ↔ CSV ConverterConvert JSON to CSV and CSV to JSON with nested flattening and delimiter control.
JSON ↔ YAML ConverterConvert JSON to YAML and YAML to JSON with indentation control and validation.
JSON ↔ TOML ConverterConvert JSON to TOML and TOML to JSON bidirectionally with validation and pretty-printing.
YAML ↔ TOML ConverterConvert YAML to TOML and TOML to YAML bidirectionally with validation and indentation control.
XML to JSON ConverterConvert XML to JSON and JSON to XML bidirectionally with pretty printing.
CSV ↔ XML ConverterConvert CSV to XML and XML to CSV bidirectionally with configurable delimiters, root tags and row tags.
SQL to JSON ConverterConvert SQL INSERT statements and table dumps into JSON objects, or generate SQL INSERT statements from JSON.

Work with JSON payloads from APIs

JSON rarely arrives alone. Decode a token to read its JSON claims, test an endpoint to see the raw payload, then turn a captured request into runnable code.

JWT DecoderDecode JSON Web Tokens to see header, payload, and signature. Validate expiration.
API TesterTest REST APIs in your browser — send GET/POST/PUT/DELETE with custom headers and body.
cURL to Code ConverterConvert cURL commands into JavaScript (Fetch, Axios), Python (Requests, HTTPX), Go, PHP, and Rust code instantly.

Guides on this topic

JSON Formatter Guide: Pretty-Print, Minify, Validate & DebugBase64 Encoding & Decoding Explained

Where this fits

These tools live under Developer Tools in the main directory, and every tool page links back to this hub so you can see how it relates to the others.

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