Free JSON Tools Hub
19 free tools · 100% in-browser

Free Online JSON Tools for Developers

Format, validate, convert and compare JSON in seconds. Convert JSON to CSV, SQL, TypeScript, YAML or XML, decode JWTs and more — privately, right in your browser.

No sign-up No upload Works offline once loaded

JSON to CSV

Turn JSON arrays into clean CSV for Excel or Google Sheets, with nested-object flattening.

CSV to JSON

Parse CSV, TSV or semicolon files into a JSON array with automatic number and boolean detection.

JSON Formatter

Beautify or minify JSON with 2/4-space or tab indentation and optional key sorting.

JSON Validator

Check JSON syntax against RFC 8259 and pinpoint errors by line and column.

JSON to TypeScript

Generate TypeScript interfaces or types from JSON, including optional fields and unions.

JSON Diff

Compare two JSON documents and list added, removed and changed values by path.

JWT Decoder

Decode a JSON Web Token’s header and payload and read exp, iat and nbf as dates.

JSON converters & utilities 9 tools

JSON to SQL

Create CREATE TABLE and INSERT statements for MySQL, PostgreSQL or SQLite from JSON.

JSON Minifier

Remove whitespace from JSON and see exactly how many bytes you save.

JSON Tree Viewer

Explore large JSON as a collapsible tree, filter keys and copy any node’s path.

JSON Schema Generator

Infer a JSON Schema (Draft 2020-12 or Draft-07) from sample JSON data.

JSON to YAML

Convert JSON to YAML and YAML back to JSON for Kubernetes, Docker and CI configs.

JSON to XML

Convert JSON to well-formed XML (with attributes) or XML back to JSON.

JSON to TOML

Convert JSON configuration to TOML tables and arrays of tables for Rust, Python and Hugo.

JSONPath Evaluator

Query JSON with JSONPath: wildcards, recursive descent, slices and filters.

JSON Escape / Unescape

Escape text for use inside a JSON string, or unescape \" and \n sequences back to text.

Developer tools 3 tools

Base64 Encode / Decode

Encode text to Base64 or decode Base64 to text, with full UTF-8 and URL-safe support.

Regex Tester

Test JavaScript regular expressions with live highlighting, match list and capture groups.

Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text (UTF-8).

Why developers use Free JSON Tools Hub

Private by design

Tools run locally in your browser. Nothing you paste or upload is sent to a server, logged or stored.

Instant results

No uploads, queues or page reloads. Output updates as you type, even for multi-megabyte files.

Standards-correct

Built on RFC 8259 JSON, RFC 4180 CSV, YAML 1.2, TOML 1.0 and RFC 7519 JWT — and tested with Unicode and edge cases.

Works everywhere

Any modern browser on Windows, macOS, Linux, Android or iOS. No install, account or extension needed.

What is JSON?

JSON (JavaScript Object Notation) is a lightweight text format for structured data. It is built from two structures — objects ({"key": "value"}) and arrays ([1, 2, 3]) — plus strings, numbers, booleans and null. Because it is easy for people to read and for every programming language to parse, JSON has become the standard format for web APIs, configuration files, log events and NoSQL databases.

Working with JSON every day means constantly reshaping it: pretty-printing a minified API response, finding the missing comma that breaks a config file, turning an export into a spreadsheet, generating types for a frontend, or checking what changed between two versions. This site puts a dedicated, well-tested tool for each of those jobs one click away.

Popular tasks

How it works

  1. Open a tool and paste your data, drop a file onto the input box, or click Load sample.
  2. Adjust the options — the result updates instantly.
  3. Copy the output or download it as a file.

Frequently asked questions

Are these JSON tools really free?

Yes. Every tool is free to use with no sign-up, no usage limits and no watermark. The site may show ads to cover hosting costs.

Is my data safe?

Your data never leaves your device. All 19 tools run in your browser with JavaScript, so nothing you paste or upload is sent to or stored on our server.

Do the tools work on mobile?

Yes. The pages work in any modern browser on phones, tablets and desktops. Large files are easier to handle on a desktop computer.

Which JSON standard do you follow?

The validator and formatter follow RFC 8259 (strict JSON). Comments, trailing commas, single quotes, NaN and Infinity are reported as errors because standard JSON parsers reject them.

Can I use the output in commercial projects?

Yes. The output belongs to you. Please review generated code, schemas and SQL before using them in production.

How do I request a new tool?

Email us at support@freejsontoolshub.com or use the contact page. Tell us what you need to convert or check and we will consider adding it.