JSON tools help validate, format, convert, compare and generate structured JSON data in the browser.

Are the JSON tools free?

Yes. ILoveTools JSON tools are free online utilities.

Do files upload to a server?

Most tools run in the browser. API testing tools contact only the endpoint you provide.

JSON tools online

Free JSON validator, formatter, converter and API tools

Validate JSON, beautify and minify data, convert CSV to JSON, compare JSON, generate fake API responses, decode JWTs, hash text and test API output in your browser.

Browse JSON tools Validate JSON

Validation

4 tools

JSON Validator

Check whether JSON is valid, readable and ready to use.

JSON Syntax Checker

Find JSON syntax problems before using data in apps or APIs.

JSON Error Finder

Locate JSON parse errors with line, column and nearby context.

JSON Linter

Lint JSON structure and format it into consistent readable output.

Formatting

4 tools

JSON Formatter

Format raw JSON with clean indentation for reading and debugging.

JSON Beautifier

Beautify compact JSON into a clean developer-friendly layout.

JSON Minifier

Remove whitespace from JSON for smaller payloads and compact storage.

JSON Pretty Print

Pretty print JSON with indentation for docs, logs and API reviews.

Conversion

15 tools

CSV to JSON

Convert CSV rows into clean JSON objects in your browser.

Excel to JSON

Convert pasted spreadsheet rows or delimited exports into JSON.

XML to JSON

Convert XML documents into nested JSON objects.

YAML to JSON

Convert simple YAML configuration into JSON.

SQL to JSON

Convert simple SQL INSERT values or rows into JSON arrays.

HTML Table to JSON

Extract HTML table rows into JSON objects.

Text to JSON

Turn lines of plain text into JSON arrays or objects.

PDF to JSON

Extract basic readable text from PDF bytes into JSON.

Image OCR to JSON

Create JSON records from image metadata and available browser OCR text.

JSON to CSV

Convert JSON arrays into CSV for spreadsheets and reports.

JSON to Excel

Convert JSON into spreadsheet-friendly TSV output.

JSON to XML

Convert JSON objects into XML markup.

JSON to YAML

Convert JSON into readable YAML-style text.

JSON to SQL

Create SQL INSERT statements from JSON arrays.

JSON to HTML Table

Render JSON arrays as an HTML table.

Utilities

19 tools

JSON Compare Tool

Compare two JSON values and highlight changed paths.

JSON Diff Viewer

View differences between two JSON documents path by path.

Merge JSON

Merge two JSON objects or arrays into one result.

Sort JSON

Sort JSON object keys recursively for stable output.

Flatten JSON

Flatten nested JSON into dot-path key value pairs.

Unflatten JSON

Expand dot-path JSON back into nested objects.

JSON Tree Viewer

Create an indented tree view of nested JSON data.

JSON Path Tester

Test simple dot-path queries against JSON data.

Escape/Unescape JSON

Escape JSON strings or unescape encoded JSON text.

JSON Key Extractor

Extract unique keys and paths from JSON data.

Remove Duplicate JSON

Remove duplicate objects or values from JSON arrays.

JSON Search Tool

Search JSON keys and values for matching text.

JSON Filter Tool

Filter JSON arrays by a simple field and value.

Random JSON Generator

Generate random JSON records for tests and demos.

Sample API Response Generator

Generate sample API response JSON for mockups.

Fake JSON Data Generator

Create fake JSON users, products and records.

UUID Generator

Generate browser-side UUID values for development.

Base64 to JSON

Decode Base64 text and parse the result as JSON.

JSON to Base64

Encode JSON text as Base64 for APIs and configs.

Developer/API Tools

8 tools

REST API Response Viewer

Fetch and view JSON API responses in the browser.

API Tester

Test GET and POST API requests and format JSON responses.

JWT Decoder

Decode JWT header and payload without sending tokens anywhere.

JWT Generator

Generate unsigned or HS256-style JWT strings for local testing.

JWT Validator

Validate JWT structure and decode token claims.

URL Encode/Decode

Encode and decode URL components for APIs.

Hash Generator

Generate SHA hashes from text in the browser.

Hash Checker

Compare text hashes with expected digest values.

Why use ILoveTools JSON tools?

JSON is the common language of web APIs, structured data, configuration files and modern app debugging. This JSON tools collection gives you fast online utilities for validation, formatting, conversion, comparison, fake data generation, JWT decoding, hashing and API response viewing. The pages are built with the same ILoveTools layout, internal linking and metadata style used by the existing PDF, image and utility tools.

Most tools run directly in the browser with lightweight JavaScript. That keeps the interface fast, avoids unnecessary upload steps, and supports strong Lighthouse scores when deployed through Firebase Hosting with caching enabled.

FAQ

What is the best JSON tool to start with?

Start with JSON Validator when data fails, JSON Formatter when data is compact, and CSV to JSON when moving spreadsheet rows into an API.

Are these tools browser-side?

Yes, most tools use client-side JavaScript. API testing pages contact only the endpoint you enter.

Can Google discover every JSON tool?

Yes. The category, homepage links, sitemap entries, canonical URLs and structured data all point to the new JSON pages.