Crate jscan 

High-performance zero-allocation JSON iterator and validator.

A faithful Rust port of romshark/jscan/v2.

Example

use jscan::{scan, scan_str, ValueType};

// Works with &[u8]
let json = br#"{"name":"Alice","age":30}"#;
let err = scan(json, |iter| {
    println!("{}: {:?}", iter.pointer(), iter.value_type());
    false // continue scanning
});
assert!(err.is_none());

// Also works with &str via scan_str
let json = r#"{"name":"Alice","age":30}"#;
let err = scan_str(json, |iter| {
    if iter.value_type() == ValueType::Number {
        println!("{} = {}", iter.pointer(), iter.value_str());
    }
    false
});
assert!(err.is_none());

Structs

Error

A JSON syntax error with location information.

Iterator

Provides access to the current JSON value during scanning.

Parser

Reusable parser. More efficient than the free functions for multiple inputs.

Validator

Reusable JSON validator. More efficient than the free functions when validating multiple inputs.

Enums

ErrorCode

Error code identifying the type of JSON error.

ValueType

JSON value type.

Functions

scan

Scan s as one complete JSON value, calling f for each encountered value. Returns None on success, or Some(Error) on failure.

scan_one

Scan one JSON value from the start of s, calling f for each encountered value. Returns (remaining, Option<Error>).

scan_str

Like scan, but accepts &str directly.

valid

Returns true if s is valid JSON.

valid_str

Like valid, but accepts &str directly.

validate

Validate that s is exactly one valid JSON value.

validate_one

Validate one JSON value from the start of s.

validate_str

Like validate, but accepts &str directly.