{ }JSON & String Lab

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Core

JSON Beautifier

JSON Editor

Valid

Enter, paste, or upload your data

ReadyRuns locally in the browser for fast, private text transformations.

Free JSON and String Tools

JSON & String Lab is a browser-based workspace for everyday text cleanup, JSON formatting, encoding, decoding, validation, and developer data conversion. Each utility has its own page with examples, privacy notes, and practical guidance so you can bookmark the exact tool you use most.

Start with the tool directory, choose a formatter or converter, paste sample text, and copy the output when it matches your workflow. The tools are designed for quick tasks like API debugging, SQL filters, spreadsheet cleanup, test data preparation, and documentation examples.

JSON Beautifier

Beautify, minify, validate, inspect, and explore JSON with pinpoint syntax errors.

String To JSON

Convert JSON-stringified text back into readable JSON when possible.

JSON To String

Convert JSON or text to a safe JSON string.

SQL IN Generator

Generate SQL IN clauses from lines or CSV.

Base64 Encode / Decode

Encode and decode Base64 text.

Line to Array

Convert newline values to JS, Python, Java, SQL, or CSV arrays.

Add Quotes

Add single, double, or backtick quotes to each line.

Remove Quotes

Remove single, double, backtick, or all quote characters.

Escape / Unescape

Escape or unescape JSON string content.

Find & Replace

Replace text with optional regex and case-sensitive mode.

CSV Converter

Convert CSV, TSV, or newline text into arrays or CSV.

URL Encode / Decode

Encode and decode URL text.

Remove Empty Lines

Remove blank lines or collapse multiple blanks.

Trim Spaces

Trim, normalize spaces, or remove tabs.

Case Converter

Convert to camel, snake, kebab, Pascal, constant, upper, or lower case.

Sort Lines

Sort lines alphabetically, numerically, or reverse.

Regex Tester

Test regex matches and capture groups.

JWT Decoder

Decode JWT header and payload locally without verification. Do not paste production tokens.

JSON ↔ YAML

Convert JSON to YAML or YAML to JSON.

Remove Duplicates

Remove duplicate lines while preserving order or case-insensitive matching.

Counters

Count characters, words, lines, bytes, and non-empty lines.